ORCID Profile
0000-0001-6081-1487
Current Organisation
University of New South Wales
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Composite and Hybrid Materials | Materials Engineering | Mechanical Engineering | Solid Mechanics | Numerical Modelling and Mechanical Characterisation | Functional Materials | Geomechanics and Resources Geotechnical Engineering | Aerospace Structures | Aerospace Materials | Nanomaterials | Dynamics, Vibration and Vibration Control | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Materials engineering | Automotive Engineering Materials | Sensor Technology (Chemical aspects) | Ship And Platform Structures | Textile Technology | Composite and hybrid materials | Nanotechnology | Resources Engineering and Extractive Metallurgy | Metals and Alloy Materials | Mechanical Engineering | Flexible Manufacturing Systems | Geospatial Information Systems | Civil Geotechnical Engineering | Construction Engineering | Medical Devices | Structural Engineering | Aerospace Engineering | Construction Materials | Civil Engineering | Nanotechnology not elsewhere classified | Numerical modelling and mechanical characterisation | Energy Generation, Conversion and Storage Engineering | Heat and Mass Transfer Operations | Aerospace Structures | Acoustics and Noise Control (excl. Architectural Acoustics) |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Metals (e.g. Composites, Coatings, Bonding) | Air Safety | Polymeric Materials (e.g. Paints) | Construction Materials Performance and Processes not elsewhere classified | Manufacturing not elsewhere classified | Air Force | Air Force | Aerospace equipment | Energy Storage (excl. Hydrogen) | Coal Mining and Extraction | Industrial Machinery and Equipment | Structural Metal Products | Energy Storage, Distribution and Supply not elsewhere classified | Technological and organisational innovation | Mining and Extraction of Energy Resources not elsewhere classified | Civil Construction Planning | Management of Noise and Vibration from Transport Activities | Primary Mining and Extraction of Mineral Resources not elsewhere classified | Aerospace Transport not elsewhere classified | Expanding Knowledge in Technology | Hydrogen Production from Renewable Energy | Automotive Equipment | Diagnostic Methods | Leather Products, Fibre Processing and Textiles not elsewhere classified | Health Status (e.g. Indicators of Well-Being)
Related Links
Publications
Theoretical modelling of the effect of plasticity on reverse transformation in superelastic shape memory alloys
Publisher: Elsevier BV
Date: 08-2003
A cohesive network approach for modelling fibre and matrix damage in composite laminates
Publisher: Elsevier BV
Date: 12-2018
A novel indirect-drive regenerative shock absorber for energy harvesting and comparison with a conventional direct-drive regenerative shock absorber
Publisher: Elsevier BV
Date: 11-2018
Delamination fatigue resistant three-dimensional textile self-healing composites
Publisher: Elsevier BV
Date: 12-2019
On the fatigue enhancement of interference fitted stop drilled holes
Publisher: Elsevier BV
Date: 09-1999
A FREQUENCY SELECTIVE POLARIZER USING CARBON FIBRE REINFORCED POLYMER COMPOSITES
Publisher: The Electromagnetics Academy
Date: 2012
Effects of mechanical deformation on electric performance of rechargeable batteries embedded in load carrying composite structures
Publisher: Informa UK Limited
Date: 06-12-2014
Synergistic delamination toughening of composites using multi-scale carbon reinforcements
Publisher: Elsevier BV
Date: 03-2019
THE EFFECT OF MEAN SHEAR STRESS ON TORSIONAL FATIGUE BEHAVIOUR
Publisher: Wiley
Date: 02-1991
DOI: 10.1111/J.1460-2695.1991.TB00659.X
Abstract: Torsional tests under different mean shear stresses were conducted at room temperature using a 1.99% NiCrMo steel. A technique was developed to control both the mean and the alternating shear stresses. It is shown that the mean shear stress plays a fundamental role in promoting stage I, mode II short crack growth. The effect of mean shear stress on the plastic deformation at stage II crack tips is discussed, which illustrates the mean shear effect on the transition between stage I and stage II crack growth. The polarity of mean shear stress is found to have no effect on the fatigue crack growth rate and the fatigue lifetime of an isotropic material. A model is proposed to account for the effect of mean shear stress on the fatigue lifetime under torsional loading.
Using Carbon Nanofibre Sensors for In-situ Detection and Monitoring of Disbonds in Bonded Composite Joints
Publisher: Elsevier BV
Date: 2017
Magnetic and mechanical properties of polyvinyl alcohol (PVA) nanocomposites with hybrid nanofillers - Graphene oxide tethered with magnetic Fe3 O4 nanoparticles
Publisher: Elsevier BV
Date: 02-2014
Fatigue and fracture behavior of laser clad repair of AerMet® 100 ultra-high strength steel
Publisher: Elsevier BV
Date: 04-2016
A Generic Design Procedure for the Repair of Acoustically Damaged Panels
Publisher: BENTHAM SCIENCE PUBLISHERS
Date: 24-03-2012
Modelling of the deformation behaviour of flake graphite iron under multi-axial cyclic loading
Publisher: SAGE Publications
Date: 10-1994
Abstract: A model based on continuum theory for describing the cyclic deformation behaviour of grey cast iron under multi-axial loading is presented and compared with test results obtained from strain-controlled tension/torsion tests. The unsymmetrical stress-strain response of cast irons under tension and compression is modelled by taking into account the opening and closing of graphite flakes, the bulk stress of cast iron being directly related to the internal stress acting on the steel matrix. Predictions are compared with experimental results obtained from proportional and non-proportional biaxial tests. The method is simple yet able to describe the essential features of the deformation of grey cast iron, and can be easily integrated with existing elasto-plastic constitutive models.
Effect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites
Publisher: Elsevier BV
Date: 10-2017
Enhancing fatigue resistance and damage characterisation in adhesively-bonded composite joints by carbon nanofibres
Publisher: Elsevier BV
Date: 09-2017
Low-temperature plasma assisted growth of vertical graphene for enhancing carbon fibre/epoxy interfacial strength
Publisher: Elsevier BV
Date: 11-2019
Increasing the fatigue resistance of epoxy nanocomposites by aligning graphene nanoplatelets
Publisher: Elsevier BV
Date: 08-2018
Fire-Resistant Flexible Polyurethane Foams via Nature-Inspired Chitosan-Expandable Graphite Coatings
Publisher: American Chemical Society (ACS)
Date: 08-07-2021
High aspect ratio galfenol flakes for high strain efficiency and sensing performance of magnetostrictive polymer composites
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TC02572H
Abstract: Highly efficient strain response achieved in low volume loading flake Galfenol olymer composites and results correlated with a novel multi-physics model, providing new insights toward use of the material type for emerging sensors and transducers.
Comprehensive pressure profiling to develop next-generation compression treatment for lymphedema: Testing efficacy of high resolution sensors
Publisher: Elsevier BV
Date: 04-2019
Scaling parameter for fatigue delamination growth in composites under varying load ratios
Publisher: Elsevier BV
Date: 12-2015
Zircons and granite metallogeny
Publisher: Informa UK Limited
Date: 30-03-2017
Optimum shapes of scarf repairs
Publisher: Elsevier BV
Date: 09-2009
Bonded Joints and Repairs to Composite Airframe Structures
Publisher: Elsevier
Date: 2016
Effect of Disbonds on the Fatigue Endurance of Composite Scarf Joints
Publisher: Trans Tech Publications, Ltd.
Date: 03-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.891-892.191
Abstract: The certification of scarf repairs requires that the repair is capable of handling flight loads in the presence of disbonds. This paper presents a study of the fatigue disbond growth behaviour of scarf joints. By determining the strain energy release rates of a disbond in a scarf joint subjected to a unit load, a predictive model based on linear elastic fracture mechanics is presented, which is shown to correlate well with experimental results. This method offers a promising technique of predicting the fatigue life of composite scarf joints with disbonds.
Highly stretchable strain sensors based on AgNWs/PV a nanocomposite hydrogels
Publisher: IEEE
Date: 12-2019
Spiral slotted waveguide antenna array
Publisher: IEEE
Date: 07-2013
Capacitively Fed Cavity-Backed Slot Antenna in Carbon-Fiber Composite Panels
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2012
A comparison and extensions of algorithms for quantitative imaging of laminar damage in plates. II. Non-monopole scattering and noise tolerance
Publisher: Elsevier BV
Date: 11-2016
Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach
Publisher: Elsevier BV
Date: 04-2015
Predictive models for stable tearing crack growth due to overloading in fatigue
Publisher: Wiley
Date: 05-12-2012
DOI: 10.1111/FFE.12018
Improving the through-thickness thermal and electrical conductivity of carbon fibre/epoxy laminates by exploiting synergy between graphene and silver nano-inclusions
Publisher: Elsevier BV
Date: 02-2015
The effect of carbon nanofibres on self-healing epoxy/poly(ε-caprolactone) blends
Publisher: Elsevier BV
Date: 10-2012
Distinguishing the Degradation of the Interdigital Piezoelectric Fibre Transducers From Structural Damage in Multifunctional Composites
Publisher: American Society of Mechanical Engineers
Date: 19-09-2012
Abstract: The next-generation design of structural components involves combining multiple functions. The goal of such Multi-functional structures (MFS) is to incorporate various tasks and functions such as structural, electrical and thermal features within a structural housing. The performance and behaviour characteristics of the multi-functional structures can be affected by degradation of any of the sub-components. This can have consequences on the safety, cost, and operational capability. Therefore, the timely and accurate detection, characterization and monitoring of the degradation in these sub-components are major concerns in the operational environment. This calls for Structural Health Monitoring (SHM) as a possible method to improve the safety and reliability of structures and thereby reduce their operational cost. As the application of SHM systems to monitor the status of the MFS increase, it will be increasingly important to determine the durability, reliability, and reparability of the components of SHM system such as sensors. The sensors themselves must be reliable enough so that they do not require replacement at intervals less than the economic lifetime of the structures and components they are monitoring. This is especially important when the deleterious structural changes in the sensor occurs without any discernible change in the structure being monitored In the present work, an assessment is carried out to quantify the degradation in the electric and electromechanical characteristics of polymer composite PZT sensors, under fatigue loading. Changes in the electrical properties of these sensors such as capacitance and inductance have been measured. The strain measurements of the sensor have also been compared to the theoretically calculated strain. The results show that the delineation of structural damage from sensor degradation is possible by monitoring the changes in the key electrical properties of the sensor components such as electrodes and PZT fibers as well as the comparison of experimentally measured and theoretically calculated strain values.
Three-dimensional solutions for transversally isotropic composite plates
Publisher: Elsevier BV
Date: 07-2002
Internal resistance heating for homogeneous curing of adhesively bonded repairs
Publisher: Elsevier BV
Date: 04-2011
Magnetic and Conductive Liquid Metal Gels
Publisher: American Chemical Society (ACS)
Date: 08-04-2020
In situ investigation of small fatigue crack growth in poly-crystal and single-crystal aluminium alloys
Publisher: Wiley
Date: 02-2002
Improving the toughness and electrical conductivity of epoxy nanocomposites by using aligned carbon nanofibres
Publisher: Elsevier BV
Date: 09-2015
Corrigendum to “Investigation of door width towards flame tilting behaviours and combustion species in compartment fire scenarios using large eddy simulation.” [International Journal of Heat and Mass Transfer 150 (2020) 119373] (International Journal of Heat and Mass Transfer (2020) 150, (S0017931019348999), (10.1016/j.ijheatmasstransfer.2020.119373))
Publisher: Elsevier BV
Date: 05-2020
Multi-modal strain and temperature sensor by hybridizing reduced graphene oxide and PEDOT:PSS
Publisher: Elsevier BV
Date: 02-2020
Enhancing the triboelectricity of stretchable electrospun piezoelectric polyvinylidene fluoride/boron nitride nanosheets composite nanofibers
Publisher: Elsevier BV
Date: 12-2020
Epoxy nanocomposites containing magnetite-carbon nanofibers aligned using a weak magnetic field
Publisher: Elsevier BV
Date: 06-2015
Predicting the complete tensile properties of additively manufactured Ti-6Al-4V by integrating three-dimensional microstructure statistics with a crystal plasticity model
Publisher: Elsevier BV
Date: 2022
Hybrid composite laminates reinforced with glass/carbon woven fabrics for lightweight load bearing structures
Publisher: Elsevier BV
Date: 04-2012
Enhancing output performance of PVDF-HFP fiber-based nanogenerator by hybridizing silver nanowires and perovskite oxide nanocrystals
Publisher: Elsevier BV
Date: 07-2022
Synergism of binary carbon nanofibres and graphene nanoplates in improving sensitivity and stability of stretchable strain sensors
Publisher: Elsevier BV
Date: 03-2019
Multifunctional polymer nanocomposites reinforced by aligned carbon nanomaterials
Publisher: MDPI AG
Date: 17-05-2018
Modified time reversal imaging of a closed crack based on nonlinear scattering
Publisher: SPIE
Date: 15-04-2016
DOI: 10.1117/12.2219393
Consideration of Biomimetics in Structural Design of Vehicle Side Intrusion Bars
Publisher: Springer Berlin Heidelberg
Date: 15-11-2012
Carbon nanofiber-reinforced strain sensors with high breathability and anisotropic sensitivity
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA08521B
Abstract: In this work, we present a new method of creating fibre-metal composites to effectively modulate the in-plane fracture behaviour of brittle conductive thin metal films on stretchable PDMS substrates via insertion of a toughening interlayer of CNFs.
On the Glinka and Neuber methods for calculating notch tip strains under cyclic load spectra
Publisher: Elsevier BV
Date: 10-2000
Improving the gas barrier, mechanical and thermal properties of poly(vinyl alcohol) with molybdenum disulfide nanosheets
Publisher: Wiley
Date: 14-02-2019
DOI: 10.1002/POLB.24799
Fatigue crack growth in adhesively bonded composite-metal double-lap joints
Publisher: Elsevier BV
Date: 07-2002
Multifunctional magneto-polymer matrix composites for electromagnetic interference suppression, sensors and actuators
Publisher: Elsevier BV
Date: 2021
Liquid metal synthesis of two-dimensional aluminium oxide platelets to reinforce epoxy composites
Publisher: Elsevier BV
Date: 09-2019
Time reversal invariance for a one-dimensional model of contact acoustic nonlinearity
Publisher: Elsevier BV
Date: 04-2017
Effect of crack closure in a specially orthotropic cylindrical shell containing an axial or a circumferential crack
Publisher: Elsevier BV
Date: 11-2004
Phase morphology of nanofibre interlayers: Critical factor for toughening carbon/epoxy composites
Publisher: Elsevier BV
Date: 2012
Reducing repair dimension with variable scarf angles
Publisher: Elsevier BV
Date: 2021
Mechanical properties of mendable composites containing self-healing thermoplastic agents
Publisher: Elsevier BV
Date: 10-2014
Improving the delamination fatigue resistance of composites by 3D woven metal and composite Z-filaments
Publisher: Elsevier BV
Date: 08-2021
Fracture and fatigue behaviour of epoxy nanocomposites containing 1-D and 2-D nanoscale carbon fillers
Publisher: Elsevier BV
Date: 11-2018
Plasticity in constrained layers: Model with point forces
Publisher: Elsevier BV
Date: 03-2002
A perturbation solution for a crack in a power-law material under gross yielding
Publisher: Wiley
Date: 02-2002
Crashworthiness behavior of Koch fractal structures
Publisher: Elsevier BV
Date: 04-2018
Crushing analysis for novel bio-inspired hierarchical circular structures subjected to axial load
Publisher: Elsevier BV
Date: 05-2018
Dual field finite element simulations of piezo-patches on fabrics: a parametric study
Publisher: SPIE
Date: 09-08-2014
DOI: 10.1117/12.2022516
Dual-breakdown direct-current triboelectric nanogenerator with synergistically enhanced performance
Publisher: Elsevier BV
Date: 08-2022
Interlayer self-healing and toughening of carbon fibre/epoxy composites using copolymer films
Publisher: Elsevier BV
Date: 03-2012
Mechanically stretchable piezoelectric polyvinylidene fluoride (PVDF)/Boron nitride nanosheets (BNNSs) polymer nanocomposites
Publisher: Elsevier BV
Date: 10-2019
Strategies for Designing Stretchable Strain Sensors and Conductors
Publisher: Wiley
Date: 24-05-2022
Wearable Sensors for Remote Health Monitoring: Potential Applications for Early Diagnosis of Covid-19
Publisher: Wiley
Date: 03-09-2022
Abstract: Wearable sensors are emerging as a new technology to detect physiological and biochemical markers for remote health monitoring. By measuring vital signs such as respiratory rate, body temperature, and blood oxygen level, wearable sensors offer tremendous potential for the noninvasive and early diagnosis of numerous diseases such as Covid‐19. Over the past decade, significant progress has been made to develop wearable sensors with high sensitivity, accuracy, flexibility, and stretchability, bringing to reality a new paradigm of remote health monitoring. In this review paper, the latest advances in wearable sensor systems that can measure vital signs at an accuracy level matching those of point‐of‐care tests are presented. In particular, the focus of this review is placed on wearable sensors for measuring respiratory behavior, body temperature, and blood oxygen level, which are identified as the critical signals for diagnosing and monitoring Covid‐19. Various designs based on different materials and working mechanisms are summarized. This review is concluded by identifying the remaining challenges and future opportunities for this emerging field.
Closure measurement and analysis for small cracks from natural discontinuities in an aluminium alloy
Publisher: Elsevier BV
Date: 2016
The Influence of Orthotropy and Taper Angle on the Compressive Strength of Composite Laminates with Scarfed Holes
Publisher: Trans Tech Publications, Ltd.
Date: 03-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.891-892.178
Abstract: The residual strengths of laminated composites containing notches or holes depend on the characteristic dimension of the notches as well as the laminate properties. This paper presents an experimental and computational investigation of the effect of orthotropy as well as scarf notch angles on the compressive strength of composite laminates made of seven different stacking sequences with the number of plies ranging between 20 and 24. Specimens containing scarfed holes of different scarf angles (6° and 10°) and straight holes of two different diameters (3.175mm and 6.35mm) were tested for comparison. Experimental results of the compressive strengths, normalised by the respective un-notched compressive strength show that the extent of orthotropy, defined as the laminate stiffness ratio along and perpendicular to the main loading direction, has a major effect. Computational modelling was carried out using the finite element method to quantify the residual strength in which ply fracture is modelled using the continuum damage mechanics approach.
Design considerations in the strengthening of composite lap joints using metal z-pins
Publisher: Elsevier BV
Date: 09-2022
Enhanced Piezoelectricity of PVDF-TrFE Nanofibers by Intercalating with Electrosprayed BaTiO3
Publisher: American Chemical Society (ACS)
Date: 23-08-2023
Activation theory for creep of woven composites
Publisher: Elsevier BV
Date: 09-1999
Precision Pollination Strategies for Advancing Horticultural Tomato Crop Production
Publisher: MDPI AG
Date: 18-02-2022
Abstract: Global climate change and anthropological activities have led to a decline in insect pollinators worldwide. Agricultural globalisation and intensification have also removed crops from their natural insect pollinators, and sparked research to identify alternate natural insect pollinators and artificial technologies. In certain countries such as Australia the importation of commercial insect pollinators is prohibited, necessitating manual labour to stimulate floral pollination. Artificial pollination technologies are now increasingly essential as the demand for food grown in protected facilities increases worldwide. For tomato fruits, precision pollination has the ability to vastly improve their seed set, size, yield, and quality under optimal environmental conditions and has become financially beneficial. Like many crops from the Solanaceae, tomatoes have a unique self-pollinating mechanism that requires stimulation of the floral organs to release pollen from the poricidal anthers. This review investigates various mechanisms employed to pollinate tomato flowers and discusses emerging precision pollination technologies. The advantages and disadvantages of various pollinating technologies currently available in the protected-cropping industry are described. We provide a buzz perspective on new promising pollination technologies involving robotic air and acoustic devices that are still in their nascency and could provide non-contact techniques to automate pollination for the tomato horticultural industry.
Wave reflection and transmission in beams containing delamination and inhomogeneity
Publisher: Elsevier BV
Date: 07-2003
Quality Factor Effect on the Wireless Range of Microstrip Patch Antenna Strain Sensors
Publisher: MDPI AG
Date: 02-01-2014
DOI: 10.3390/S140100595
Experimental investigation of two- and three-dimensional graphene-based thermo-acoustic sound generating devices: Analysis of gap separation effect
Publisher: Elsevier BV
Date: 11-2023
A novel route for tethering graphene with iron oxide and its magnetic field alignment in polymer nanocomposites
Publisher: Elsevier BV
Date: 08-2016
Effect of Incipient Heat Damage on the Fatigue Properties of Aircraft Composites
Publisher: Trans Tech Publications, Ltd.
Date: 03-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.891-892.1810
Abstract: This paper presents a preliminary investigation into the effect of incipient heat damage on the mechanical properties of a carbon-epoxy composite. Specimens were exposed to a range of temperatures varying from 0°C to 280°C for one hour and then tested to quantify the effects of this high temperature exposure on the short-beam shear, Mode I and II interlaminar fracture toughness, and the Mode I fatigue properties. The results showed that as the exposure temperature increased, the short-beam shear suffered a reduction, whereas the Mode I and Mode II fracture toughness increased after an initial reduction. The fatigue disbond growth rates were largely un-affected under heat exposure below 280°C. This complex behaviour in the degradation in fracture toughness is likely due to the increased fibre bridging brought about by the reduction in matrix strength.
Toughening and self-healing of epoxy matrix laminates using mendable polymer stitching
Publisher: Elsevier BV
Date: 07-2012
Fundamental solutions for the generalised plane strain theory
Publisher: Elsevier BV
Date: 09-2002
Strengthening and toughening epoxy polymer at cryogenic temperature using cupric oxide nanorods
Publisher: Elsevier BV
Date: 05-2021
Processable 3-nm thick graphene platelets of high electrical conductivity and their epoxy composites
Publisher: IOP Publishing
Date: 27-02-2014
DOI: 10.1088/0957-4484/25/12/125707
Abstract: Graphene platelets (GnPs) are a class of novel 2D nanomaterials owing to their very small thickness (∼3 nm), high mechanical strength and electric conductivity (1460 S cm(-1)), and good compatibility with most polymers as well as cost-effectiveness. In this paper we present a low-cost processing technique for producing modified GnPs and an investigation of the electrical and mechanical properties of the resulting composites. After dispersing GnPs in solvent N-methyl-2-pyrrolidone, a long-chain surfactant (Jeffamine D 2000, denoted J2000) was added to covalently modify GnPs, yielding J2000-GnPs. By adjusting the ratio of GnPs to the solvent, the modified GnPs show different average thickness and thus electrical conductivity ranging from 694 to 1200 S cm(-1). To promote the exfoliation and dispersion of J2000-GnPs in a polymeric matrix, they were dispersed in the solvent again and further modified using diglycidyl ether of bisphenol A (DGEBA) producing m-GnPs, which were then compounded with an epoxy resin for the development of epoxy/m-GnP composites. A percolation threshold of electrical volume resistivity for the resulting composites was observed at 0.31 vol%. It was found that epoxy/m-GnP composites demonstrated far better mechanical properties than those of unmodified GnPs of the same volume fraction. For ex le, m-GnPs at 0.25 vol% increased the fracture energy release rate G1c from 0.204 ± 0.03 to 1.422 ± 0.24 kJ m(-2), while the same fraction of unmodified GnPs increased G1c to 1.01 ± 0.24 kJ m(-2). The interface modification also enhanced the glass transition temperature of neat epoxy from 58.9 to 73.8 °C.
The gust-mitigating potential of flapping wings
Publisher: IOP Publishing
Date: 02-08-2016
DOI: 10.1088/1748-3190/11/4/046010
Abstract: Nature's flapping-wing flyers are adept at negotiating highly turbulent flows across a wide range of scales. This is in part due to their ability to quickly detect and counterract disturbances to their flight path, but may also be assisted by an inherent aerodynamic property of flapping wings. In this study, we subject a mechanical flapping wing to replicated atmospheric turbulence across a range of flapping frequencies and turbulence intensities. By means of flow visualization and surface pressure measurements, we determine the salient effects of large-scale freestream turbulence on the flow field, and on the phase-average and fluctuating components of pressure and lift. It is shown that at lower flapping frequencies, turbulence dominates the instantaneous flow field, and the random fluctuating component of lift contributes significantly to the total lift. At higher flapping frequencies, kinematic forcing begins to dominate and the flow field becomes more consistent from cycle to cycle. Turbulence still modulates the flapping-induced flow field, as evidenced in particular by a variation in the timing and extent of leading edge vortex formation during the early downstroke. The random fluctuating component of lift contributes less to the total lift at these frequencies, providing evidence that flapping wings do indeed provide some inherent gust mitigation.
Hierarchically structured electrodes for moldable supercapacitors by synergistically hybridizing vertical graphene nanosheets and MnO2
Publisher: Elsevier BV
Date: 02-2021
A vertical graphene enhanced Zn–MnO2 flexible battery towards wearable electronic devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA08775K
Abstract: A multilayer structured cathode for zinc ion batteries is created by using vertical graphene nano-maze to hold MnO 2 and encapsulating with an ionic conductive PEDOT:PSS layer. The new electrode exhibits exceptional capacity and cycle performance.
Imaging Damage Using Mixed Passive and Active Sensors
Publisher: Trans Tech Publications, Ltd.
Date: 06-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.558.244
Abstract: Existing damage imaging techniques rely on the use of active sensors, such as piezoelectric actuators, that can both transmit and receive guided waves. This paper presents a new time-reversal imaging approach to enable the use of passive sensors, such as optical fibre sensors and strain gauges, to augment active sensors for imaging structural damage. Computational simulations have revealed that damage size and severity can be accurately determined from the scattered wave using as few as six sensors: one active sensor and five passive sensors.
Wireless Strain Sensors Using Electromagnetic Resonators
Publisher: American Society of Mechanical Engineers
Date: 19-09-2012
Abstract: The concept of wireless passive strain sensors has been introduced in the last few years for applications such as structural health monitoring. This study investigates the use of circular microstrip patch antenna (CMPA) sensors for wireless passive measurement of strain. The strain induced in an aluminium plate was measured wirelessly up to 5 cm away from the sensor using a CMPA made from commercial FR4 substrate, and at a distance up to 20 cm using a CMPA made from Rogers® RT/duroid 6010™. These results show the substrate of antennas is one of the factors affecting the interrogation distance. The interrogation distance between the sensor and the patch antenna was improved significantly using the Rogers® substrate.
Progressive damage in single lap countersunk composite joints
Publisher: IOP Publishing
Date: 06-2010
Effect of Filler Materials on the Performance of Conformal Load-Bearing Spiral Antennas
Publisher: American Society of Mechanical Engineers
Date: 19-09-2012
Abstract: The slots in spiral antennas induce stress concentrations and hence may adversely affect the load-carrying capacity of the structural antenna. To minimise the detrimental effect of the slots, appropriate fillers are required to provide structural reinforcement without compromising the radar performance of the antenna. This paper presents an investigation of the effects of electrical and mechanical properties of potential filler materials on the performance of slot spiral antennas. Finite element analysis is carried out for a slot spiral that is designed to work in the C-Band range of frequencies (4–8 GHz). Computational simulations performed using commercial software packages ANSYS® and HFSS® show that by using commercially available filler materials the stress concentration factor of the spiral slot can be reduced by 20%. The results from this research enhance the previously introduced advantages of this type of conformal load-bearing antenna structure (CLAS). This CLAS concept provides a promising solution of replacing conventional externally mounted antennas, thus reducing aircraft weight and aerodynamic drag.
Improved design methods for scarf repairs to highly strained composite aircraft structure
Publisher: Elsevier BV
Date: 09-2006
A PATH‐INDEPENDENT PARAMETER FOR FATIGUE UNDER PROPORTIONAL AND NON‐PROPORTIONAL LOADING
Publisher: Wiley
Date: 12-1993
Residual strength of composite laminates containing scarfed and straight-sided holes
Publisher: Elsevier BV
Date: 12-2011
N-doped reduced graphene oxide (rGO) wrapped carbon microfibers as binder-free electrodes for flexible fibre supercapacitors and sodium-ion batteries
Publisher: Elsevier BV
Date: 05-2021
Synergistically enhancing the electrical conductivity of carbon fibre reinforced polymers by vertical graphene and silver nanowires
Publisher: Elsevier BV
Date: 05-2023
Experimental and numerical perspective on the fire performance of MXene/Chitosan/Phytic acid coated flexible polyurethane foam
Publisher: Springer Science and Business Media LLC
Date: 25-02-2021
DOI: 10.1038/S41598-021-84083-2
Abstract: Recent discoveries of two-dimensional transitional metal based materials have emerged as an excellent candidate for fabricating nanostructured flame-retardants. Herein, we report an eco-friendly flame-retardant for flexible polyurethane foam (PUF), which is synthesised by hybridising MXene (Ti $$_3\\hbox {C}_2$$ 3 C 2 ) with biomass materials including phytic acid (PA), casein, pectin, and chitosan (CH). Results show that coating PUFs with 3 layers of CH/PA/Ti $$_3\\hbox {C}_2$$ 3 C 2 via layer-by-layer approach reduces the peak heat release and total smoke release by 51.1% and 84.8%, respectively. These exceptional improvements exceed those achieved by a CH/Ti $$_3\\hbox {C}_2$$ 3 C 2 coating. To further understand the fundamental flame and smoke reduction phenomena, a pyrolysis model with surface regression was developed to simulate the flame propagation and char layer. A genetic algorithm was utilised to determine optimum parameters describing the thermal degradation rate. The superior flame-retardancy of CH/PA/Ti $$_3\\hbox {C}_2$$ 3 C 2 was originated from the shielding and charring effects of the hybrid MXene with biomass materials containing aromatic rings, phenolic and phosphorous compounds.
Modelling mechanical properties of core-shell rubber-modified epoxies
Publisher: Elsevier BV
Date: 24-01-2000
Wearable Supercapacitive Temperature Sensors with High Accuracy Based on Ionically Conductive Organogel and Macro‐Kirigami Electrode
Publisher: Wiley
Date: 20-11-2022
Abstract: Wearable temperature sensors with high accuracy are critical for human health monitoring. Ideally, they should show accuracy matching that of medical‐grade thermometers (i.e., ± ≈0.1–0.2 °C). Achieving this goal has proven challenging for sensors that must also meet key wearable requirements, such as flexibility, stretchability, and breathability. Herein, a new stretchable supercapacitive temperature sensor with a resolution of ±0.2 °C, is presented, which was achieved by. Two new strategies to increase temperature sensitivity and minimize the interferences of mechanical stretching and pressure: a) synthesizing an ion‐conductive NaCl‐organogel to serve as the redox‐active separator to increase sensitivity and suppress interference of compression and b) using a kirigami design to decrease the interference of stretch and improve breathability. These two novel strategies endow the supercapacitive temperature sensors with a temperature accuracy of ±0.2 °C and exceptionally high sensitivity of 0.095 °C −1 , which is more than 13 times higher than traditional dielectric‐capacitive sensors. The potential of the supercapacitive sensor in measuring body temperature is demonstrated by continuously monitoring skin temperatures under a medical compression garment that exerts pressure on the skin and the unsteady wrist flexion. The findings confirm that the organogel‐based supercapacitive sensors offer an extraordinary temperature accuracy significantly better than wearable sensors reported in the literature. The combined characteristics of high resolution, linearity, breathability, and stretchability make this sensor a promising candidate for skin‐interfaced health monitoring devices.
Stretchable Nanocomposite Conductors Enabled by 3D Segregated Dual-Filler Network
Publisher: Wiley
Date: 05-03-2019
Mindlin plate theory for damage detection: Imaging of flexural inhomogeneities
Publisher: Acoustical Society of America (ASA)
Date: 02-2010
DOI: 10.1121/1.3277217
Abstract: The scattering of plate waves by localized damage or defects that can be modeled as flexural inhomogeneities is examined within the framework of Mindlin plate theory. These inhomogeneities are characterized by variations in one or more of the four plate-theory parameters: the bending stiffness, shear stiffness, rotary inertia, and transverse inertia. It is shown that the Born approximation for the scattered field leads to a plate-theory analog of the Fourier diffraction theorem, which relates the far-field scattering litude to the spatial Fourier transform of the inhomogeneity variations. The application of this result is illustrated by using synthetic data derived for an idealized model of a delamination as a flexural inhomogeneity, ignoring mode coupling effects. A computationally efficient implementation of the filtered back-propagation algorithm, based on the eigensystem of the scattering operator, is employed for image reconstruction. The implications for in-situ imaging of structural damage in plate-like structures are briefly discussed, and some directions for further work are indicated.
Biomimetic Design of Lightweight Vehicle Structures Based on Animal Bone Properties
Publisher: Trans Tech Publications, Ltd.
Date: 2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.633.3
Abstract: This paper presents a comprehensive biomimetic design approach to developing novel load bearing lightweight vehicle structures inspired by the structural properties of animal bones. Lightweight vehicle structures developed in this way would have increased stiffness at significantly reduced weight. In this research, trabecular (cancellous) bone was analyzed at the metaphyses of four different species including rat, rabbit, chicken, and sheep. Three-dimensional models of bone structures were reconstructed from micro-CT scanned images using the computer aided design software Mimics. Force resistance and energy absorption properties of relevant bone structures subjected to quasi-static compression loads were investigated and analysed using the Finite Element (FE) method. Based on the obtained results, the paper discusses the effects of load directions, bone structure allocation and model thickness on the energy absorption and force resistance of the bone structures. The simulation results obtained in this research were compared to the results of conventional vehicle side intrusion bars.
Fatigue Crack Closure due to Surface Roughness and Plastic Deformation
Publisher: Trans Tech Publications, Ltd.
Date: 03-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.891-892.319
Abstract: Crack closure is an important factor affecting fatigue crack growth in high strength alloy materials. Plasticity is known to be the main driver of closure, but in some materials and at some stages other mechanisms such as fracture surface roughness and debris accumulation are also important. Analytical models based on the plasticity induced closure concept have been very successful in correlating fatigue crack growth rates and lives for a range of materials under constant litude and spectrum loading. However, extreme values of plastic constraint factors, significantly lower than those determined from three dimensional finite element studies on similar geometry, are needed to achieve good correlation with experimental results, particularly for materials which exhibit rough and tortuous fatigue surfaces. One such material investigated here is β-annealed Ti-6Al-4V titanium alloy. The aim of this paper is to further develop, apply and evaluate a crack closure model which combines roughness and plasticity induced closure, incorporating experimental measurements of fracture surface roughness from tests on Eccentrically Loaded Single Edge-Notch Tension (ESE(T)) specimens. The model was first proposed by Zhang et al. 2002 for short cracks in 2000 series Aluminium Alloy. The model was evaluated here for physically longer cracks in the Titanium Alloy material. Accurate surface profile and roughness measurements were made using an optical 3-D profiler with a vertical resolution of better than 0.15 μm. Verification of the proposed model was carried out by comparing the model prediction with the closure measurements by back-face strain compliance using the pin-loaded ESE(T) specimens. Results from the roughness model were then compared with results from the FASTRAN analytical crack closure code. Analysis using this new approach, with plastic constraint factors more closely aligned with the values determined from independent classical and three dimensional finite element studies, provide a solid basis from which to implement the approach in FASTRAN.
Improved Near-Field Radar Cross-Section Measurement Technique
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2009
An implicit algorithm using explicit correctors for the kinematic hardening model with multiple back stresses
Publisher: Wiley
Date: 2001
DOI: 10.1002/NME.111
Analytical and numerical modelling of wave scattering by a linear and nonlinear contact interface
Publisher: Elsevier BV
Date: 09-2019
Simultaneous improvement of heating efficiency and mechanical strength of a self-healing thermoplastic polymer by hybridizing magnetic particles with conductive fibres
Publisher: Elsevier BV
Date: 09-2023
A 3d printed, constriction-resistive sensor for the detection of ultrasonic waves
Publisher: Materials Research Forum LLC
Date: 20-02-2021
DOI: 10.21741/9781644901311-33
Abstract: Abstract. Ultrasonic waves, either bulk waves or guided waves, are commonly used for non-destructive evaluation, for ex le in structural health monitoring. Traditional sensors for detecting ultrasonic waves include metallic strain gauges and piezoelectric ceramics. Recently piezoresistive nanocomposites have emerged as a promising sensor with high sensing range. In this paper, a constriction-resistive based sensor made from a graphene reinforced PLA filament is developed using a fused deposition modelling 3D printing approach as a novel type of ultrasonic sensor for structural health monitoring purposes. The sensor is made of very low-cost and recyclable thermoplastic material, which is lightweight and can be either directly printed onto the surface of various engineering structures, or embedded into the interior of a structure via fused filament fabrication 3D printing. These characteristics make this sensor a promising candidate compared to the traditional sensors in detecting ultrasonic waves for structural health monitoring. The printed sensors can detect ultrasonic signals with frequencies around 200 kHz, with good signal-to-noise ratio and sensitivity. When deployed between two adjacent printed tracks , and exploiting a novel kissing-bond mechanism, the sensor is capable of detecting ultrasonic waves. Several confirmatory experiments were carried out on this printed sensor to validate the capability of the printed sensor for structural health monitoring.
Conductive Polymer Nanocomposites for Stretchable Electronics: Material Selection, Design, and Applications
Publisher: American Chemical Society (ACS)
Date: 13-09-2021
Machine-learning assisted laser powder bed fusion process optimization for AlSi10Mg: New microstructure description indices and fracture mechanisms
Publisher: Elsevier BV
Date: 12-2020
High-precision, stretchable kirigami-capacitive sensor with ultra-low cross-sensitivity for body temperature monitoring
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/D1TA06978K
Abstract: Precise skin temperature monitoring with a 0.14 °C resolution is realized through (a) reducing strain interference with an optimized kirigami pattern and (b) increasing temperature sensitivity with low melting temperature TPU as the dielectric core.
Surface functionalisation of carbon nanofiber and barium titanate by polydopamine to enhance the energy storage density of their nanocomposites
Publisher: Elsevier BV
Date: 12-2019
Recent Advances in Fiber‐Shaped Supercapacitors and Lithium‐Ion Batteries
Publisher: Wiley
Date: 09-09-2019
Abstract: The rapid development in wearable electronics has spurred a great deal of interest in flexible energy storage devices, particularly fiber-shaped energy storage devices (FSESDs), such as fiber-shaped supercapacitors (FSSCs) and fiber-shaped batteries (FSBs). Depending on their electrode configurations, FSESDs can contain five differently structured electrodes, including parallel fiber electrodes (PFEs), twisted fiber electrodes (TFDs), wrapped fiber electrodes (WFEs), coaxial fiber devices (CFEs), and rolled electrodes (REs). Various rational methods have been devised to incorporate these fiber-shaped electrodes into multifunctional FSESDs, including fiber-shaped supercapacitors, lithium-ion batteries, lithium-sulfur batteries, lithium-air batteries, zinc-air batteries, and aluminum-air batteries. Although significant progress has been made in FSESDs, it remains a major challenge to make high-performance fiber-shaped devices at low cost. A focused and critical review of the recent advancements in fiber-shaped supercapacitors and lithium-ion batteries is provided here. The pros and cons for each of the aforementioned electrode configurations and FSESDs are discussed, along with current challenges and future opportunities for FSESDs.
Optimisation of Composite Sandwich Structures Subjected to Combined Torsion and Bending Stiffness Requirements
Publisher: Springer Science and Business Media LLC
Date: 19-07-2011
Biotechnologies toward Mitigating, Curing, and Ultimately Preventing Edema through Compression Therapy
Publisher: Elsevier BV
Date: 05-2018
DOI: 10.1016/J.TIBTECH.2018.02.013
Abstract: For a century-old problem, edema and its treatment have gone remarkably unnoticed by the biomedical community. Given the prevalence of lymphedema and its debilitating repercussions, there is an acute need for both efficacy-based measures and clinical standards to guide compression garment design and therapeutic application. This review outlines the current state of the art in compression treatment and suggests an integrated biomedical engineering approach going forward. Characterizing the pressure gradient profiles of commercial compression sleeves is necessary to better understand the role of compression treatment in the mitigation of swelling. Integration of pressure sensor technologies with advanced materials design and manufacture provides a critical path not only to elucidate the mechanisms of but also to improve on current compression-based therapies and associated therapeutic devices.
A closure model to crack growth under large-scale yielding and through residual stress fields
Publisher: ASME International
Date: 04-2003
DOI: 10.1115/1.1493804
Abstract: This paper presents a closure model for predicting the growth behavior of short cracks in the presence of large-scale yielding and residual compressive stresses, representative of structures that have been shot-peened. The plasticity-induced crack closure model developed by Newman is first extended by using the cyclic crack-tip opening displacement as the correlating parameter for fatigue crack growth rates. This new approach also enables a better characterization of the effect of large-scale yielding on short crack growth. The effect of residual stress on crack closure is then analyzed by adding to the loading spectrum an equivalent stress, which varies with the applied load level and the crack size. It is shown that predictions of the extended closure model are within a factor of two of the experimental results of etched specimens tested under spectrum loading, highlighting the capability of the predictive model along with some important issues for future research in this area.
Effect of transformation volume contraction on the toughness of superelastic shape memory alloys
Publisher: IOP Publishing
Date: 04-10-2002
Rational Design of Ultrasensitive Pressure Sensors by Tailoring Microscopic Features
Publisher: Wiley
Date: 11-06-2018
Improving the bending strength and energy absorption of corrugated sandwich composite structure
Publisher: Elsevier BV
Date: 12-2013
Characterization of Piezo Fiber-Based Sensors Responses in Multifunctional Composites
Publisher: Trans Tech Publications, Ltd.
Date: 11-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.409.633
Abstract: Structural health monitoring systems (SHMS) are increasingly being considered for implementation in a wide range of industries, including transport, civil infrastructure, and energy production. As the application of SHM systems increase, it will be increasingly important to quantify the durability, reliability, and reparability of the SHM system. This paper investigates the electrical and electro-mechanical characteristics of piezoelectric sensors in an attempt to distinguish sensor failure from structural damage [10]. This study involved the measurements of pertinent electrical properties for MFC (Macro Fibre Composite) sensor under fatigue loading and comparison of the strain measurements to characterize the degradation of the structure as well as the MFC. Changes in the capacitance and inductance of this sensor have been recorded, highlighting deleterious structural changes in the sensor itself without any discernible change in the structure being monitored.
Ultrasonic detection and sizing of compressed cracks in glass- and carbon-fibre reinforced plastic composites
Publisher: Elsevier BV
Date: 12-2017
Thermal Degradation and Fire Properties of Fungal Mycelium and Mycelium - Biomass Composite Materials
Publisher: Springer Science and Business Media LLC
Date: 04-12-2018
DOI: 10.1038/S41598-018-36032-9
Abstract: Mycelium and mycelium-biomass composites are emerging as new sustainable materials with useful flame-retardant potentials. Here we report a detailed characterisation of the thermal degradation and fire properties of fungal mycelium and mycelium-biomass composites. Measurements and analyses are carried out on key parameters such as decomposition temperatures, residual char, and gases evolved during pyrolysis. Pyrolysis flow combustion calorimetry (PCFC) evaluations reveal that the corresponding combustion propensity of mycelium is significantly lower compared to poly(methyl methacrylate) (PMMA) and polylactic acid (PLA), indicating that they are noticeably less prone to ignition and flaming combustion, and therefore safer to use. The hyphal diameters of mycelium decrease following pyrolysis. Cone calorimetry testing results show that the presence of mycelium has a positive influence on the fire reaction properties of wheat grains. This improvement is attributable to the relatively higher charring tendency of mycelium compared to wheat grain, which reduces the heat release rate (HRR) by acting as a thermal insulator and by limiting the supply of combustible gases to the flame front. The mycelium growth time has been found to yield no significant improvements in the fire properties of mycelium-wheat grain composites.
Wearable Temperature Sensors with Enhanced Sensitivity by Engineering Microcrack Morphology in PEDOT:PSS–PDMS Sensors
Publisher: American Chemical Society (ACS)
Date: 15-07-2020
Effect of mendable polymer stitch density on the toughening and healing of delamination cracks in carbon-epoxy laminates
Publisher: Elsevier BV
Date: 07-2013
A hybrid embedded cohesive element method for predicting matrix cracking in composites
Publisher: Elsevier BV
Date: 02-2016
Surface Functionalization of Electrodes and Synthesis of Dual-Phase Solid Electrolytes for Structural Supercapacitors
Publisher: American Chemical Society (ACS)
Date: 27-06-2022
Abstract: The interface between structural electrodes and solid electrolytes plays a key role in the electrical-mechanical properties of energy storage structures. Herein, we present a surface functionalization method to improve the ion conduction efficiency at the interface between a structural electrode and a solid electrolyte that consists of a bi-continuous network of epoxy and ionic liquid (IL). Composite supercapacitors made with this electrolyte and carbon fiber (CF) electrodes coated with manganese dioxide (MnO
Mindlin plate theory for damage detection: Source solutions
Publisher: Acoustical Society of America (ASA)
Date: 07-2004
DOI: 10.1121/1.1739482
Abstract: A consideration of the relevant length scales and time scales suggests that Mindlin plate theory provides a judicious model for damage detection. A systematic investigation of this theory is presented that emphasizes its mixed vector-scalar character and analogies with 3D elasticity. These analogies lead to the use of Helmholtz potentials, and to compact statements of the reciprocal theorem and the representation theorem. The plate response for a point moment is derived using a direct source specification, rather than an indirect specification through boundary conditions. Solutions are presented for combinations of such point moments (doublets) that represent, respectively, a center of bending, a center of twist and a center of inplane twist. The flexural response due to finite sources, such as piezoelectric actuators, can be modeled by distributions of centers of bending. Detailed results are presented for a circular, and for a narrow rectangular actuator. The far-field radiation pattern for an array of equally spaced actuators parallel to a straight boundary is derived. The solutions presented for the point moment and the point force constitute the components of a dyadic Green’s function which is required, along with its spatial derivatives, for a representation of plate-wave scattering by flexural inhomogeneities.
Aligning carbon nanofibres in glass-fibre/epoxy composites to improve interlaminar toughness and crack-detection capability
Publisher: Elsevier BV
Date: 11-2017
On the characterization of fatigue crack growth in a plate with a single-sided repair
Publisher: ASME International
Date: 18-03-2004
DOI: 10.1115/1.1647129
Abstract: An unsupported cracked plate repaired with a reinforcement bonded on one side may experience considerable out-of-plane bending due to the load-path eccentricity. This out-of-plane bending causes the stress intensity factor at the crack tip to vary significantly through the plate’s thickness with a maximum value attained at the un-patched side of the crack. Even though significant analytical work has been done in the past to evaluate these thickness-varying stress intensity factors, however, to the authors’ knowledge, little work has been done to characterize the fatigue crack growth in a plate with a single-sided repair. The purposes of the present work are to (i) assess the accuracy of the available analytical methods for predicting the stress intensity factors of the panels with a single-sided repair and more importantly, and (ii) characterize the fatigue crack growth in these panels, using test results generated recently under the Composite Repair of Aircraft Structures (CRAS) program.
Folding Large Graphene-on-Polymer Films Yields Laminated Composites with Enhanced Mechanical Performance
Publisher: Wiley
Date: 11-07-2018
Abstract: A folding technique is reported to incorporate large-area monolayer graphene films in polymer composites for mechanical reinforcement. Compared with the classic stacking method, the folding strategy results in further stiffening, strengthening, and toughening of the composite. By using a water-air-interface-facilitated procedure, an A5-size 400 nm thin polycarbonate (PC) film is folded in half 10 times to a ≈0.4 mm thick material (1024 layers). A large PC/graphene film is also folded by the same process, resulting in a composite with graphene distributed uniformly. A three-point bending test is performed to study the mechanical performance of the composites. With a low volume fraction of graphene (0.085%), the Young's modulus, strength, and toughness modulus are enhanced in the folded composite by an average of 73.5%, 73.2%, and 59.1%, respectively, versus the pristine stacked polymer films, or 40.2%, 38.5%, and 37.3% versus the folded polymer film, proving a remarkable mechanical reinforcement from the combined folding and reinforcement of graphene. These results are rationalized with combined theoretical and computational analyses, which also allow the synergistic behavior between the reinforcement and folding to be quantified. The folding approach could be extended/applied to other 2D nanomaterials to design and make macroscale laminated composites with enhanced mechanical properties.
Analytical and numerical 1D modelling of the nonlinear scattering at a rough-surface contact interface with clapping
Publisher: Elsevier BV
Date: 10-2020
Progressive multi-scale modelling of composite laminates
Publisher: Elsevier
Date: 2005
Fatigue Testing of Generic Bonded Joints
Publisher: Elsevier
Date: 2002
Bumblebees minimize control challenges by combining active and passive modes in unsteady winds
Publisher: Springer Science and Business Media LLC
Date: 18-10-2016
DOI: 10.1038/SREP35043
Abstract: The natural wind environment that volant insects encounter is unsteady and highly complex, posing significant flight-control and stability challenges. It is critical to understand the strategies insects employ to safely navigate in natural environments. We combined experiments on free flying bumblebees with high-fidelity numerical simulations and lower-order modeling to identify the mechanics that mediate insect flight in unsteady winds. We trained bumblebees to fly upwind towards an artificial flower in a wind tunnel under steady wind and in a von Kármán street formed in the wake of a cylinder. Analysis revealed that at lower frequencies in both steady and unsteady winds the bees mediated lateral movement with body roll - typical casting motion. Numerical simulations of a bumblebee in similar conditions permitted the separation of the passive and active components of the flight trajectories. Consequently, we derived simple mathematical models that describe these two motion components. Comparison between the free-flying live and modeled bees revealed a novel mechanism that enables bees to passively ride out high-frequency perturbations while performing active maneuvers at lower frequencies. The capacity of maintaining stability by combining passive and active modes at different timescales provides a viable means for animals and machines to tackle the challenges posed by complex airflows.
Biocompatible and highly stretchable PVA/AgNWs hydrogel strain sensors for human motion detection
Publisher: Wiley
Date: 06-09-2020
Improving the actuation performance of magneto-polymer composites by silane functionalisation of carbonyl-iron particles
Publisher: Elsevier BV
Date: 09-2020
Boosting the electrical conductivity of polymer matrix composites using low resistivity Z-filaments
Publisher: Elsevier BV
Date: 10-2020
Wireless strain measurement using circular microstrip patch antennas
Publisher: Elsevier BV
Date: 09-2012
Multi-scale toughening of epoxy composites via electric field alignment of carbon nanofibres and short carbon fibres
Publisher: Elsevier BV
Date: 10-2018
Analytical and finite element prediction of Lamb wave scattering at delaminations in quasi-isotropic composite laminates
Publisher: Elsevier BV
Date: 10-2012
Transparent, stretchable and high-performance triboelectric nanogenerator based on dehydration-free ionically conductive solid polymer electrode
Publisher: Elsevier BV
Date: 10-2021
Time reversal invariance for a nonlinear scatterer exhibiting contact acoustic nonlinearity
Publisher: Elsevier BV
Date: 03-2018
Strain stiffening and positive piezoconductive effect of liquid metal/elastomer soft composites
Publisher: Elsevier BV
Date: 2021
Healing of carbon fibre-epoxy composite T-joints using mendable polymer fibre stitching
Publisher: Elsevier BV
Date: 02-2013
Electrospun liquid metal/PVDF-HFP nanofiber membranes with exceptional triboelectric performance
Publisher: Elsevier BV
Date: 02-2022
A review of toroidal composite pressure vessel optimisation and damage tolerant design for high pressure gaseous fuel storage
Publisher: Elsevier BV
Date: 12-2016
Carbon fiber reinforced Zn–MnO2 structural composite batteries
Publisher: Elsevier BV
Date: 06-2021
Thermally mendable epoxy resin strengthened with carbon nanofibres
Publisher: Elsevier BV
Date: 12-2013
Effects of bondline flaws on the damage tolerance of composite scarf joints
Publisher: Elsevier BV
Date: 12-2013
Characterising fibre compression fracture toughness of composites using bearing tests
Publisher: Elsevier BV
Date: 10-2019
Nondestructive Testing of Defects in Polymer–Matrix Composite Materials for Marine Applications Using Terahertz Waves
Publisher: Springer Science and Business Media LLC
Date: 02-04-1299
An extended diffraction tomography method for quantifying structural damage using numerical Green's functions
Publisher: Elsevier BV
Date: 05-2015
DOI: 10.1016/J.ULTRAS.2015.01.001
Abstract: Existing damage imaging algorithms for detecting and quantifying structural defects, particularly those based on diffraction tomography, assume far-field conditions for the scattered field data. This paper presents a major extension of diffraction tomography that can overcome this limitation and utilises a near-field multi-static data matrix as the input data. This new algorithm, which employs numerical solutions of the dynamic Green's functions, makes it possible to quantitatively image laminar damage even in complex structures for which the dynamic Green's functions are not available analytically. To validate this new method, the numerical Green's functions and the multi-static data matrix for laminar damage in flat and stiffened isotropic plates are first determined using finite element models. Next, these results are time-gated to remove boundary reflections, followed by discrete Fourier transform to obtain the litude and phase information for both the baseline (damage-free) and the scattered wave fields. Using these computationally generated results and experimental verification, it is shown that the new imaging algorithm is capable of accurately determining the damage geometry, size and severity for a variety of damage sizes and shapes, including multi-site damage. Some aspects of minimal sensors requirement pertinent to image quality and practical implementation are also briefly discussed.
E-jacket: posture detection with loose-fitting garment using a novel strain sensor
Publisher: IEEE
Date: 04-2020
Investigation of door width towards flame tilting behaviours and combustion species in compartment fire scenarios using large eddy simulation.
Publisher: Elsevier BV
Date: 04-2020
Two-birds-one-stone: multifunctional supercapacitors beyond traditional energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE03167D
Abstract: A comprehensive overview on the recent progress of multifunctional supercapacitors which combine energy storage capability with other functions.
THE EFFECTS OF MEAN AND ALTERNATING SHEAR STRESSES ON SHORT FATIGUE CRACK GROWTH RATES
Publisher: Wiley
Date: 12-1992
Closed crack imaging using time reversal method based on fundamental and second harmonic scattering
Publisher: Elsevier BV
Date: 11-2016
Thermoplastic healing in epoxy networks: Exploring performance and mechanism of alternative healing agents
Publisher: Wiley
Date: 18-04-2013
Toughening carbon fibre composites at cryogenic temperatures using low-thermal expansion nanoparticles
Publisher: Elsevier BV
Date: 11-2021
Graphene platelets versus phosphorus compounds for elastomeric composites: Flame retardancy, mechanical performance and mechanisms
Publisher: IOP Publishing
Date: 08-07-2019
Abstract: Polymers are widely used but their flammability remains a serious issue causing fatalities and property damage. Herein we present an investigation into the effectiveness of graphene platelets (GnPs) to simultaneously improve the flame retardancy and mechanical properties of ethylene propylene diene monomer rubber (EPDM). EPDM was melt compounded respectively with GnPs and a commercial flame retardant (ammonium polyphosphate, APP) to produce two groups of composites. Although both fillers were well dispersed in EPDM, GnPs significantly improved the mechanical properties of EPDM whilst APP compromised some of the mechanical properties particularly at high fractions. This difference was attributed to the filler particle size and interfacial bonding. Through cone calorimetry testing, 21 wt% char yield was recorded for the EPDM/GnP composite at 12.0 vol%, in comparison with 8 wt% for the EPDM/APP composite. APP was able to lower the peak heat release rate (PHRR) and specific mass loss rate (MLR), but unfortunately it decreased the ignition time and fire performance index (FPI). By contrast, GnPs has been found to increase ignition time by 29% and FPI by 62%, while still achieved the same level of reductions in PHRR and specific MLR, demonstrating clear advantages over APP. During combustion the highly thermally stable GnPs bonded with the viscous, degraded EPDM macromolecules, forming a thick solid char layer which prevented the transport of heat and smoke, contributing to its superior flame retarding performance over APP.
A slot spiral in carbon-fibre composite laminate as a conformal load-bearing antenna
Publisher: SAGE Publications
Date: 07-06-2014
Abstract: Conformal load-bearing antenna structures, which afford load-bearing structures with radar capability, are a promising technology to reduce weight and drag of air vehicles. This article presents an investigation of the mechanical and electromagnetic performance of slot log-spiral antenna in carbon-fibre composite structures. Compared with traditional rectangular slots, equiangular slot spiral antenna is found to offer broader bandwidth and better mechanical strength. Through experimental testing and finite element analyses, a new tip design is proposed that can significantly reduce the stress concentration of the non-load-bearing log-spiral antenna. Results of mechanical tests also show that the compressive strength of a carbon-fibre composite plate featuring a spiral slot is comparable with that pertinent to a plate with a circular hole of the same size. Filling the slots with epoxy resin can further enhance the compressive strength.
SHORT FATIGUE CRACK GROWTH UNDER MEAN STRESS, UNIAXIAL LOADING
Publisher: Wiley
Date: 02-1993
Scattering of plate waves by a cylindrical inhomogeneity
Publisher: Elsevier BV
Date: 04-2005
Nonlinear mixing of non-collinear guided waves at a contact interface
Publisher: Elsevier BV
Date: 02-2021
Integrating phase field and crystal plasticity finite element models for simulations of titanium alloy Ti-5553
Publisher: IOP Publishing
Date: 07-09-2021
Abstract: The ability to simultaneously predict the microstructure and bulk material properties of 3D printed (additively manufactured or AM) metals is critical to the development of process intelligence that can be used by a digital-twin for forecasting and optimising alloy composition and fabrication parameters. This study proposes a simulation framework for predicting the microstructure and corresponding meso- and macro-scale properties of AM materials. This is achieved by integrating phase-field and crystal plasticity modelling techniques, whereby the phase field model predicts the microstructure and the crystal plasticity constitutive model computes the stress–strain evolution using the microstructure as the input. The simulation of multiple microstructures demonstrates that this integrated approach can be used to test the influence of different microstructures on the mechanical properties of titanium alloy Ti-5553. This includes the influence of grain size and grain orientation on both the meso- and macro-scale behaviour.
Ply-overlap hybrid technique for joining dissimilar composite materials
Publisher: Elsevier BV
Date: 06-2016
A Computerized time-reversal method for structural health monitoring
Publisher: SPIE
Date: 04-08-2003
DOI: 10.1117/12.484668
Creating ionic pathways in solid-state polymer electrolyte by using PVA-coated carbon nanofibers
Publisher: Elsevier BV
Date: 05-2021
Review on polymer composites with high thermal conductivity and low dielectric properties for electronic packaging
Publisher: Elsevier BV
Date: 2022
Compact solutions for the corner singularity in bonded lap joints
Publisher: Elsevier BV
Date: 04-2000
The effect of dual-scale carbon fibre network on sensitivity and stretchability of wearable sensors
Publisher: Elsevier BV
Date: 09-2018
Fracture mechanics of specially orthotropic shells containing a crack
Publisher: Oxford University Press (OUP)
Date: 08-2005
DOI: 10.1093/QJMAM/HBI017
Energy Storage Structural Composites with Integrated Lithium-Ion Batteries: A Review
Publisher: Wiley
Date: 15-04-2021
Abstract: Integration of lithium‐ion batteries into fiber‐polymer composite structures so as to simultaneously carry mechanical loads and store electrical energy offer great potential to reduce the overall system weight. Herein, recent progresses in integration methods for achieving high mechanical efficiencies of embedding commercial lithium‐ion batteries inside composite materials are reviewed. The manufacturing techniques used to fabricate energy storage structural composites are discussed together with a comparison of their mechanical properties, energy storage capacity, and electrical performance. The mechanical performance of energy storage composites containing lithium‐ion batteries depends on many factors, including manufacturing method, materials used, structural design, and bonding between the structure and the integrated batteries. Energy storage composites with integrated lithium‐ion pouch batteries generally achieve a superior balance between mechanical performance and energy density compared to other commercial battery systems. Potential applications are presented for energy storage composites containing integrated lithium‐ion batteries including automotive, aircraft, spacecraft, marine and sports equipment. Opportunities and challenges in fabrication methods, mechanical characterizations, trade‐offs in engineering design, safety, and battery subcomponents are also discussed.
Carbon fibre electrodes for ultra long cycle life pseudocapacitors by engineering the nano-structure of vertical graphene and manganese dioxides
Publisher: Elsevier BV
Date: 06-2021
A two-degree-of-freedom aeroelastic energy harvesting system with coupled vortex-induced-vibration and wake galloping mechanisms
Publisher: AIP Publishing
Date: 06-02-2023
DOI: 10.1063/5.0128616
Abstract: Vortex-induced vibration (VIV) and wake galloping are two aeroelastic instability phenomena with similar underlying mechanisms related to vortex shedding. Inspired by this common feature, a two-degree-of-freedom (2DOF) piezoelectric aeroelastic energy harvester (PAEH) is proposed, which employs VIV and wake galloping mechanisms with their respective benefits to improve the wind energy harvesting performance in a wide wind speed range. The proposed 2DOF PAEH overcomes the limitations of conventional one-degree-of-freedom VIV and wake galloping energy harvesters, with the former being only effective in a single and narrow lock-in wind speed range and the latter failing to work at low wind speeds. The modal frequencies of the 2DOF PAEHs are easily manipulated, and the twin mechanisms improve power generation over two lock-in regions at low wind speeds by the VIV mechanism and a third power generation region at relatively higher wind speeds due to wake galloping. A coupled aero-electro-mechanical model is developed and verified by wind tunnel experiments on a prototype. The results show that the proposed harvester efficiently extracts wind energy in a wide wind speed range from 1.1 to 6 m/s. The influence of the distance between the two parallel bluff bodies, in which distance is a critical parameter, on the voltage output is experimentally investigated, revealing three distinct aerodynamic behaviors at different distances.
An enhanced vacuum cure technique for on-aircraft repair of carbon-bismaleimide composites
Publisher: Springer Science and Business Media LLC
Date: 29-06-2011
Closure of plane-strain cracks under large-scale yielding conditions
Publisher: Wiley
Date: 02-2002
Nanosilica-toughened polymer adhesives
Publisher: Elsevier BV
Date: 09-2014
Analytical Methods for Designing Composite Repairs
Publisher: Elsevier
Date: 2002
Crashworthiness design of novel hierarchical hexagonal columns
Publisher: Elsevier BV
Date: 06-2018
Multifunctional properties of epoxy nanocomposites reinforced by aligned nanoscale carbon
Publisher: Elsevier BV
Date: 03-2016
Liquid Metal Droplet and Graphene Co-Fillers for Electrically Conductive Flexible Composites
Publisher: Wiley
Date: 29-09-2020
Abstract: Colloidal liquid metal alloys of gallium, with melting points below room temperature, are potential candidates for creating electrically conductive and flexible composites. However, inclusion of liquid metal micro- and nanodroplets into soft polymeric matrices requires a harsh auxiliary mechanical pressing to rupture the droplets to establish continuous pathways for high electrical conductivity. However, such a destructive strategy reduces the integrity of the composites. Here, this problem is solved by incorporating small loading of nonfunctionalized graphene flakes into the composites. The flakes introduce cavities that are filled with liquid metal after only relatively mild press-rolling ( 30 kPa. The composites are used for forming flexible electrically-conductive tracks in electronic circuits with a self-healing property. The demonstrated application of co-fillers, together with liquid metal droplets, can be used for establishing electrically-conductive printable-composite tracks for future large-area flexible electronics.
Comparison of detailed soot formation models for sooty and non-sooty flames in an under-ventilated ISO room
Publisher: Elsevier BV
Date: 12-2017
Improving the delamination resistance and impact damage tolerance of carbon fibre-epoxy composites using multi-scale fibre toughening
Publisher: Elsevier BV
Date: 11-2021
Recent developments of hybrid piezo–triboelectric nanogenerators for flexible sensors and energy harvesters
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NA00501D
Abstract: Hybrid piezo–triboelectric nanogenerators constitute a new class of self-powered systems that exploit the synergy of piezoelectric and triboelectric mechanisms to address the energy and power needs for portable and wearable electronic devices.
Strengthening of composite T-joints using 1D and 2D carbon nanoparticles
Publisher: Elsevier BV
Date: 2021
Healing of fatigue delamination cracks in carbon-epoxy composite using mendable polymer stitching
Publisher: SAGE Publications
Date: 20-09-2014
Abstract: This article presents an experimental investigation into the mode I delamination fatigue properties and fatigue crack healing mechanism of a self-healing carbon fibre–epoxy composite containing mendable thermoplastic stitches. Mode I interlaminar fatigue tests using double cantilever bending specimens show that through-the-thickness reinforcement of the composite with mendable poly(ethylene- co-(methacrylic acid)) stitches is highly effective in healing delamination cracks and restoring the fatigue properties. Aided by a pressure delivery mechanism unique to this type of mendable thermoplastic, the healing agent stored in an interconnected network of stitches is able to flow into narrow delamination cracks. The mode I interlaminar fatigue resistance as well as the fracture toughness of the composite was fully restored by poly(ethylene- co-(methacrylic acid)) stitches. Transverse tension tests were performed to determine the traction law of the healing agent, which controls the healing efficiency and interlaminar toughening mechanism under static and fatigue mode I interlaminar loading.
Aligning multilayer graphene flakes with an external electric field to improve multifunctional properties of epoxy nanocomposites
Publisher: Elsevier BV
Date: 11-2015
Fire and electrically resistive silicone elastomer/alumina trihydrate composites derived from nanoclay and chopped glass fibres for industrial fire safety
Publisher: Elsevier BV
Date: 11-2022
Synergistic mode II delamination toughening of composites using multi-scale carbon-based reinforcements
Publisher: Elsevier BV
Date: 02-2019
A Rapid and Sensitive Method for Evaluating Wool Damage in Carbonizing
Publisher: SAGE Publications
Date: 12-1987
DOI: 10.1177/004051758705701208
Abstract: Damage caused to wool in the carbonizing process can be assessed by methods such as alkali solubility or by determining the loss in tensile strength of the yarns and fabrics so produced. These tests are reliable and reproducible, but they are time consuming and provide a result some five or more hours after the process is complete. It is then too late to adjust the process variables so as to minimize the damage to the wool. A rapid and sensitive test is described, which is based on the ninhydrin reaction with peptides and is able to measure the damage within only 10 minutes of s ling the carbonized wool immediately after baking. The results correlate well with both alkali solubility and tensile strength test methods. The new test procedure allows for the possibility of an "on-line" method of controlling damage in the wool carbonizing process.
Actuated dielectric-lossy screen for dynamically suppressing electromagnetic interference
Publisher: American Chemical Society (ACS)
Date: 09-11-2020
Ultrasonic activation of mendable polymer for self-healing carbon–epoxy laminates
Publisher: Elsevier BV
Date: 06-1987
A critical evaluation of superposition methods for cracks in grossly plastic gradient fields
Publisher: Elsevier BV
Date: 03-2002
Nondestructive evaluation of mechanically loaded advanced marine composite structures
Publisher: Trans Tech Publications, Ltd.
Date: 03-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.891-892.594
Abstract: Marine composite structures subject to dynamic loading typically incorporate more than one material type, and consist of laminate sections up to hundreds of millimetres in thickness. These solid hybrid laminates exhibit different behaviour in static and fatigue loading from thin aerospace composite laminates and sandwich structures. There is therefore a need to better understand the likely damage and degradation mechanisms that will occur in these thick structures and to concurrently develop nondestructive evaluation (NDE) technology to meet the consequent inspection problems. In this paper we present details of an ongoing fatigue program on marine composite blades. The challenges for ultrasonic NDE of thick composites, and emerging inspection methods using state-of-the-art inspection systems and analysis tools will be discussed.
Determination of Stress Intensity Factors for a Cracked Shell under Bending with Improved Shell Theories
Publisher: American Society of Civil Engineers (ASCE)
Date: 2006
Mitigating cryogenic microcracking in carbon-fibre reinforced polymer composites using negative thermal-expansion nanoparticles functionalized by a polydopamine coating
Publisher: Elsevier BV
Date: 05-2023
A Review of Passive Wireless Sensors for Structural Health Monitoring
Publisher: Canadian Center of Science and Education
Date: 28-01-2013
DOI: 10.5539/MAS.V7N2P57
Electrocaloric effect in relaxor ferroelectric polymer nanocomposites for solid-state cooling
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA04465B
Abstract: Ferroelectric polymer nanocomposites demonstrate improved adiabatic change of temperature and isothermal change of entropy and markedly enhanced heating–cooling efficiency.
Three-dimensional stress constraint in an elastic plate with a notch
Publisher: Elsevier BV
Date: 08-2002
A Comparison of Statistically Equivalent and Realistic Microstructural Representative Volume Elements for Crystal Plasticity Models
Publisher: Springer Science and Business Media LLC
Date: 28-03-2022
DOI: 10.1007/S40192-022-00257-4
Abstract: Two methods used to construct a microstructural representative volume element (RVE) were evaluated for their accuracy when used in a crystal plasticity-based finite element (CP-FE) model. The RVE-based CP-FE model has been shown to accurately predict the complete tensile stress–strain response of a Ti–6Al–4V alloy manufactured by laser powder bed fusion. Each method utilized a different image-based technique to create a three-dimensional (3D) RVE from electron backscatter diffraction (EBSD) images. The first method, referred to as the realistic RVE (R-RVE), reconstructed a physical 3D microstructure of the alloy from a series of parallel EBSD images obtained using serial-sectioning (or slicing). The second method captures key information from three orthogonal EBSD images to create a statistically equivalent microstructural RVE (SERVE). Based on the R-RVEs and SERVEs, the CP-FE model was then used to predict the complete tensile stress–strain response of the alloy, including the post-necking damage progression. The accuracy of the predicted stress–strain responses using the R-RVEs and SERVEs was assessed, including the effects of each microstructure descriptor. The results show that the R-RVE and the SERVE offer comparable accuracy for the CP-FE purposes of this study.
Mode II interlaminar delamination resistance and healing performance of 3D composites with hybrid z-fibre reinforcement
Publisher: Elsevier BV
Date: 05-2019
Optimum Design of Composite Sandwich Structures Subjected to Combined Torsion and Bending Loads
Publisher: Springer Science and Business Media LLC
Date: 19-05-2020
Novel Electrically Conductive Porous PDMS/Carbon Nanofiber Composites for Deformable Strain Sensors and Conductors
Publisher: American Chemical Society (ACS)
Date: 17-04-2017
Abstract: Highly flexible and deformable electrically conductive materials are vital for the emerging field of wearable electronics. To address the challenge of flexible materials with a relatively high electrical conductivity and a high elastic limit, we report a new and facile method to prepare porous polydimethylsiloxane/carbon nanofiber composites (denoted by p-PDMS/CNF). This method involves using sugar particles coated with carbon nanofibers (CNFs) as the templates. The resulting three-dimensional porous nanocomposites, with the CNFs embedded in the PDMS pore walls, exhibit a greatly increased failure strain (up to ∼94%) compared to that of the solid, neat PDMS (∼48%). The piezoresistive response observed under cyclic tension indicates that the unique microstructure provides the new nanocomposites with excellent durability. The electrical conductivity and the gauge factor of this new nanocomposite can be tuned by changing the content of the CNFs. The electrical conductivity increases, while the gauge factor decreases, upon increasing the content of CNFs. The gauge factor of the newly developed sensors can be adjusted from approximately 1.0 to 6.5, and the nanocomposites show stable piezoresistive performance with fast response time and good linearity in ln(R/R
The answer is blowing in the wind: Free-flying honeybees can integrate visual and mechano-sensory inputs for making complex foraging decisions
Publisher: The Company of Biologists
Date: 2016
DOI: 10.1242/JEB.142679
Abstract: Bees navigate in complex environments using visual, olfactory and mechano-sensorial cues. In the lowest region of the atmosphere the wind environment can be highly unsteady and bees employ fine motor-skills to enhance flight control. Recent work reveals sophisticated multi-modal processing of visual and olfactory channels by the bee brain to enhance foraging efficiency, but it currently remains unclear if wind-induced mechano-sensory inputs are also integrated with visual information to facilitate decision making. In idual honeybees were trained in a linear flight arena with appetitive-aversive differential conditioning to use a context setting cue of 3 m s−1 cross-wind direction to enable decisions about either a ‘blue’ or ‘yellow’ star stimulus being the correct alternative. Colour stimuli properties were mapped in bee-specific opponent-colour spaces to validate saliency, and to thus enable rapid reverse learning. Bees were able to integrate mechano-sensory and visual information to facilitate decisions that were significantly different to chance expectation after 35 learning trials. An independent group of bees were trained to find a single rewarding colour that was unrelated to the wind direction. In these trials wind was not used as a context-setting cue and served only as a potential distracter in identifying the relevant rewarding visual stimuli. Comparing between respective groups shows that bees can learn to integrate visual and mechano-sensory information in a non-elemental fashion, revealing an unsuspected level of sensory processing in honeybees, and adding to the growing body of knowledge on the capacity of insect brains to use multi-modal sensory inputs in mediating foraging behaviour.
Higher harmonic generation of guided waves at delaminations in laminated composite beams
Publisher: SAGE Publications
Date: 23-10-2016
Abstract: Detection and characterization of delamination damage are of great importance to the assurance of structural safety. This work investigates the potential of a baseline-free structural health monitoring technique based on higher harmonics resulting from the nonlinear interaction of guided wave and a delamination. The nonlinearity considered in this study arises from the clapping of the sub-laminates in the delaminated region, which generates contact acoustic nonlinearity. Both explicit finite element simulations and experimental tests are conducted on composite laminates containing a delamination of different sizes and at different through-thickness locations. The results show that the interaction between the fundamental asymmetric mode ( A 0 ) of guided wave and a delamination generates contact acoustic nonlinearity in the form of higher harmonics, which provides a good measure for identifying the existence of delaminations and determining their sizes in laminated composite beams. This new insight into the generation mechanisms of nonlinear higher order harmonics in composite laminates will enhance the detection and monitoring of damage in composite structures.
Amplitude-robust metastructure with combined bistable and monostable mechanisms for simultaneously enhanced vibration suppression and energy harvesting
Publisher: AIP Publishing
Date: 10-04-0001
DOI: 10.1063/5.0136134
Abstract: This Letter reports an litude-robust nonlinear dual-functional metastructure that combines bistable and monostable-hardening mechanisms in the local resonators for simultaneous energy harvesting and vibration suppression. The concept is verified by experiments using a primary beam with six pairs of piezoelectric cantilevered oscillators and numerical analyses using a fully coupled electromechanical model for varying base vibration acceleration and load resistance. The results show that the design offers a wide bandgap at high accelerations, attenuation of transmission peaks, and generation of power over a broad bandwidth, outperforming its linear, pure bistable, and pure monostable counterparts. The dual-functional capabilities are further quantitatively assessed by using a weighted index that reflects both the vibration and power generation behaviors. This study demonstrates opportunities in development of the smart nonlinear metastructures for simultaneous vibration suppression and energy harvesting.
The strong diamagnetic behaviour of unidirectional carbon fiber reinforced polymer laminates
Publisher: AIP Publishing
Date: 12-2012
DOI: 10.1063/1.4764041
Abstract: Carbon fibers are finite conductors with a weak diamagnetic response in a static magnetic field. When illuminated with a high-frequency alternating electromagnetic wave such that the skin depth is greater than the fiber diameter, carbon-fiber composites are shown to exhibit a strong dynamic diamagnetic response. The magnetic susceptibility (χm) is controlled by the polarization angle (θ), which is the angle between the incident electric field and conductor direction. A closed form solution for this behaviour was derived using Maxwell's equations and an understanding of the induced conductor currents. The equation was verified using simulation and free space “wall” and waveguide measurements on unidirectional IM7/977-3 carbon fiber reinforced polymer laminates. The measured responses ranged from non-magnetic at θ = 90°, χm = 0, up to strongly diamagnetic at θ = 30°, χm = −0.75, over the 8-18 GHz bandwidth. The experimental results are in good agreement with theoretical predictions and computational simulations.
Current status of carbon fibre and carbon fibre composites recycling
Publisher: Elsevier BV
Date: 07-2020
Influence of cross-sectional thickness on fatigue crack growth
Publisher: Wiley
Date: 05-1999
On cache prefetching strategies for integrated infostation-cellular network
Publisher: IEEE
Date: 11-2006
Bonded repairs for carbon/BMI composite at high operating temperatures
Publisher: Elsevier BV
Date: 07-2010
Hierarchical mode I and mode II interlaminar toughening of Z-pinned composites using 1D and 2D carbon nanofillers
Publisher: Elsevier BV
Date: 09-2019
Dual functionalisation of polyurethane foam for unprecedented flame retardancy and antibacterial properties using layer-by-layer assembly of MXene chitosan with antibacterial metal particles
Publisher: Elsevier BV
Date: 09-2022
On the utilisation of nonlinear plasticity models in military aircraft fatigue estimation: A preliminary comparison
Publisher: Elsevier BV
Date: 12-2017
Topological design of pentamode lattice metamaterials using a ground structure method
Publisher: Elsevier BV
Date: 04-2021
An Investigation of Wool Hydrolysis in Conventional Carbonizing
Publisher: SAGE Publications
Date: 04-1989
DOI: 10.1177/004051758905900407
Abstract: We have investigated the extent of wool hydrolysis in the carbonizing steps of acid izing, delay between acidizing and drying, baking, and delay between baking and neutralizing. We have also examined the roles played by oxygen and sorbed water. We found that wool was hydrolyzed by 5% (w/v) sulfuric acid solution even at room temperature during the delay time between the acidizing and drying steps. The drying of acidized wool can be ided into two stages. In the first stage of drying, the rate of wool hydrolysis changes with drying time, but remains constant in the second stage of drying. We observed critical temperature points at 70°C in drying and at 120°C in baking, above which wool hydrolysis increases significantly. The results suggest that in the absence of water, virtually no wool hydrolysis will occur under acid conditions however, no amount of drying will curtail wool hydrolysis because of powerful water retention by the sulfuric acid. Oxygen does not appear to play any significant role in wool hydrolysis during carbonizing.
Enabling contactless rapid on-demand debonding and rebonding using hysteresis heating of ferrimagnetic nanoparticles
Publisher: Elsevier BV
Date: 11-2021
Life prediction techniques for variable amplitude multiaxial fatigue—Part 2: Comparison with experimental results
Publisher: ASME International
Date: 07-1996
DOI: 10.1115/1.2806822
Abstract: An extensive multiaxial random fatigue test programme was conducted at room temperature using tubular specimens. Experiments were performed under combined tension/torsion and triaxial loading, covering proportional and nonproportional variable litude loading cases. The two proposed life prediction methods discussed in Part 1 are evaluated using the experimental results, demonstrating that these two methods provide satisfactory predictions.
Life prediction techniques for variable amplitude multiaxial fatigue—Part 1: Theories
Publisher: ASME International
Date: 07-1996
DOI: 10.1115/1.2806821
Abstract: Fatigue life prediction under multiaxis random loading is an extremely complex and intractable topic only a few methods have been proposed in the literature. In addition, experimental results under multiaxis random loading are also scarce. In part one of this two-part paper, a multiaxial non-proportional cycle counting method and fatigue damage calculation procedure are proposed, which is compared with one published damage-searching method. Both theories are based on critical plane concepts, one being an extension of the local strain approach for uniaxial variable litude loading and the other employing a new counting algorithm for multiaxis random loading. In principle, these two methods can be considered as bounding solutions for fatigue damage accumulation under multiaxis random loading.
Multifunctional MXene/natural rubber composite films with exceptional flexibility and durability
Publisher: Elsevier BV
Date: 05-2020
Effects of adherend thickness and taper on adhesive bond strength measured by portable pull-off tests
Publisher: Elsevier BV
Date: 07-2013
MXene/chitosan nanocoating for flexible polyurethane foam towards remarkable fire hazards reductions
Publisher: Elsevier BV
Date: 2020
DOI: 10.1016/J.JHAZMAT.2019.120952
Abstract: MXene/chitosan nanocoating for flexible polyurethane foam (PUF) was prepared via layer-by-layer (LbL) approach. MXene (Ti
Synergies of vertical graphene and manganese dioxide in enhancing the energy density of carbon fibre-based structural supercapacitors
Publisher: Elsevier BV
Date: 2021
On plastic deformation and fatigue under multiaxial loading
Publisher: Elsevier BV
Date: 03-1996
Multi-scale toughening of fibre composites using carbon nanofibres and z-pins
Publisher: Elsevier BV
Date: 08-2016
Development of flame-retarding elastomeric composites with high mechanical performance
Publisher: Elsevier BV
Date: 06-2018
Hybrid Polymer Composites for High Strain Rate Applications
Publisher: Elsevier
Date: 2016
High-performance hierarchical MnO2/CNT electrode for multifunctional supercapacitors
Publisher: Elsevier BV
Date: 10-2021
Experimental investigation of damage progression and strength of countersunk composite joints
Publisher: Elsevier BV
Date: 02-2012
Expanding the Use of the Rapid Ninhydrin Test Method
Publisher: SAGE Publications
Date: 11-1989
DOI: 10.1177/004051758905901107
Abstract: The rapid ninhydrin test method established for measuring wool damage in car bonizing has been expanded to examine wool hydrolysis in various wet treatments. bleaching, and exposure to light and to dry heat. The pH range from about 3 to 8.5 was safe for wet treatments, but the extent of hydrolysis damage in wet treatments at 100°C for 1 hour, even in the safe pH range, was greater than that with carbonizing. If the temperature of the wet treatments could be reduced to 90°C. the extent of hydrolysis would reduce to half of its value at 100°C. Wool was highly sensitive to hydrolysis under the action of light, but the action of dry heat did not appear to yield ninhydrin-positive extractable material.
Plasticity induced crack closure in adhesively bonded joints under fatigue loading
Publisher: Elsevier BV
Date: 2015
Recent advances in carbon-based nanomaterials for flame retardant polymers and composites
Publisher: Elsevier BV
Date: 05-2021
Prediction of short fatigue crack propagation behaviour by characterization of both plasticity and roughness induced crack closures
Publisher: Elsevier BV
Date: 05-2002
Hierarchical strengthening of carbon fibre composite T-joints using nanoparticles and Z-pins
Publisher: Elsevier BV
Date: 03-2022
An effective method to optimise plasma immersion ion implantation: Sensitivity analysis and design based on low-density polyethylene
Publisher: Wiley
Date: 28-02-2022
Abstract: The performance of polymer surface treatment using plasma immersion ion implantation (PIII) depends on many operating parameters, such as treatment duration, radiofrequency power, pulsed bias voltage and pulse repetition rate, and the ion fluence applied on the polymer surface. Currently, the identification of optimal operating parameters to achieve specific performance targets is heavily based on trail and error with extensive experimental testing. Herein, we present an optimisation method based on sensitivity analysis using polynomial chaos expansion and experimental design with Kriging surrogate model to greatly reduce the amount of experiments. The combined effects of PIII operating parameters on low‐density polyethylene surface modifications are investigated, demonstrating the validation and effectiveness of the method and design. The new approach offers highly accurate and computationally efficient way for achieving optimum radical density, wettability and optical transmittance that are important for biomedical applications.
Interaction of laminate damage and adhesive disbonding in composite scarf joints subjected to combined in-plane loading and impact
Publisher: Elsevier BV
Date: 02-2012
A Method for determining the elastic-plastic response ahead of a notch tip
Publisher: ASME International
Date: 07-1999
DOI: 10.1115/1.2812380
Abstract: The stress distribution ahead of a notch tip is the prerequisite to calculating the driving force for cracks emanating from notches. This article first examines whether two commonly used engineering methods, which are often employed to determine the response at a notch tip, can be applied to evaluate the elastic-plastic response ahead of a notch tip. It is found that both methods would significantly underestimate the stress-strain distribution ahead of a notch tip. Based deformation theories of plasticity, and analytical method is then developed, taking into account of the effects of stress redistribution induced by notch plasticity and the in-plane and through-thickness constraints near the notch root. Predictions are shown to be in close correlation with finite element results.
Predicting the fire spread rate of a sloped pine needle board utilizing pyrolysis modelling with detailed gas-phase combustion
Publisher: Elsevier BV
Date: 10-2018
Aerogels based on carbon nanomaterials
Publisher: Springer Science and Business Media LLC
Date: 11-07-2016
Rapidly cured epoxy/anhydride composites: Effect of residual stress on laminate shear strength
Publisher: Elsevier BV
Date: 11-2016
Phase structure dependence of magnetic behaviour in iron oxide nanorods
Publisher: Elsevier BV
Date: 2020
A Handheld Hydraulic Soft Robotic Device With Bidirectional Bending End-Effector for Minimally Invasive Surgery
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2023
Analytical and numerical modelling of non-collinear wave mixing at a contact interface
Publisher: Elsevier BV
Date: 03-2020
Effect of interface modification on PMMA/graphene nanocomposites
Publisher: Springer Science and Business Media LLC
Date: 28-05-2014
The electric field alignment of short carbon fibres to enhance the toughness of epoxy composites
Publisher: Elsevier BV
Date: 03-2018
Experimental testing of BMI laminates with stress concentrations and the evaluation of SIFT to predict failure
Publisher: Elsevier BV
Date: 11-2008
A synthetic time-reversal imaging method for structural health monitoring
Publisher: IOP Publishing
Date: 11-03-2004
A comparison and extensions of algorithms for quantitative imaging of laminar damage in plates. I. Point spread functions and near field imaging
Publisher: Elsevier BV
Date: 11-2015
Out-of-plane crashworthiness of bio-inspired self-similar regular hierarchical honeycombs
Publisher: Elsevier BV
Date: 06-2016
Functional Ultra‐High Molecular Weight Polyethylene Composites for Ligament Reconstructions and Their Targeted Applications in the Restoration of the Anterior Cruciate Ligament
Publisher: MDPI AG
Date: 28-05-2022
Abstract: The selection of biomaterials as biomedical implants is a significant challenge. Ultra-high molecular weight polyethylene (UHMWPE) and composites of such kind have been extensively used in medical implants, notably in the bearings of the hip, knee, and other joint prostheses, owing to its biocompatibility and high wear resistance. For the Anterior Cruciate Ligament (ACL) graft, synthetic UHMWPE is an ideal candidate due to its biocompatibility and extremely high tensile strength. However, significant problems are observed in UHMWPE based implants, such as wear debris and oxidative degradation. To resolve the issue of wear and to enhance the life of UHMWPE as an implant, in recent years, this field has witnessed numerous innovative methodologies such as biofunctionalization or high temperature melting of UHMWPE to enhance its toughness and strength. The surface functionalization/modification/treatment of UHMWPE is very challenging as it requires optimizing many variables, such as surface tension and wettability, active functional groups on the surface, irradiation, and protein immobilization to successfully improve the mechanical properties of UHMWPE and reduce or eliminate the wear or osteolysis of the UHMWPE implant. Despite these difficulties, several surface roughening, functionalization, and irradiation processing technologies have been developed and applied in the recent past. The basic research and direct industrial applications of such material improvement technology are very significant, as evidenced by the significant number of published papers and patents. However, the available literature on research methodology and techniques related to material property enhancement and protection from wear of UHMWPE is disseminated, and there is a lack of a comprehensive source for the research community to access information on the subject matter. Here we provide an overview of recent developments and core challenges in the surface modification/functionalization/irradiation of UHMWPE and apply these findings to the case study of UHMWPE for ACL repair.
THE EFFECT OF PLY ORIENTATION ON THE PERFORMANCE OF ANTENNAS IN OR ON CARBON FIBER COMPOSITES
Publisher: The Electromagnetics Academy
Date: 2011
DOI: 10.2528/PIER11031512
Sensitivity and optimisation of the Chaboche plasticity model parameters in strain-life fatigue predictions
Publisher: Elsevier BV
Date: 03-2017
Waste-derived low-cost mycelium composite construction materials with improved fire safety
Publisher: Wiley
Date: 29-05-2018
DOI: 10.1002/FAM.2637
A scale distortion invariant pattern recognition with fractional matching filter correlation
Publisher: SPIE
Date: 26-01-2007
DOI: 10.1117/12.725957
Multimodal Capacitive and Piezoresistive Sensor for Simultaneous Measurement of Multiple Forces
Publisher: American Chemical Society (ACS)
Date: 17-04-2020
Active control of a flexible smart beam using a system identification technique based on ARMAX
Publisher: IOP Publishing
Date: 25-09-2003
Utilising genetic algorithm to optimise pyrolysis kinetics for fire modelling and characterisation of chitosan/graphene oxide polyurethane composites
Publisher: Elsevier BV
Date: 02-2020
Quantitative fractography and modelling of fatigue crack propagation in high strength AerMet®100 steel repaired with a laser cladding process
Publisher: Elsevier BV
Date: 2017
Nano-toughening of transparent wearable sensors with high sensitivity and a wide linear sensing range
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA05129B
Abstract: A new highly sensitive and stretchable strain sensor with excellent linearity and optical transparency has been developed by toughening of microcracks within the thin conductive films.
Increasing crack growth resistance for through-thickness matrix cracking and its role in suppressing ply cracking in thin-ply laminates
Publisher: Elsevier BV
Date: 12-2022
Fatigue Crack Growth Analysis of Repaired Structures
Publisher: Elsevier
Date: 2002
Crashworthiness of bionic fractal hierarchical structures
Publisher: Elsevier BV
Date: 11-2018
A generalized plane-strain theory for transversally isotropic plates
Publisher: Springer Science and Business Media LLC
Date: 03-2003
A Review on Additive Manufacturing of Shape-Memory Materials for Biomedical Applications
Publisher: Springer Science and Business Media LLC
Date: 23-01-2020
Self-similar analysis of plasticity-induced closure of small fatigue cracks
Publisher: Elsevier BV
Date: 02-2001
Computational Analysis of the Structural Integrity of Self-Healing Composites
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.2576
Abstract: This paper presents a computational and experimental investigation of the influence of self-healing micro-vessels on the structural properties of laminated composites. Embedded self-healing system is rapidly emerging as an important technology for improving the damage resistance of laminated composites. Introduction of hollow fibres or hollow spheres can, however, potentially weaken the structure and lead to excessive reduction in mechanical performance of composites. In this research, computational simulation is carried out to investigate the effect of embedded microvascular vessels on the mechanical properties of self-healing composite, focusing on the stress concentrations around self-healing vessels and delamination cracking.
Modelling complex progressive failure in notched composite laminates with varying sizes and stacking sequences
Publisher: Elsevier BV
Date: 03-2014
Unidirectional, highly linear strain sensors with thickness-engineered conductive films for precision control of soft machines
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA02064E
Abstract: By drop-casting conductive inks onto the soft 3D printed surfaces, strain sensors of spatially-varying thickness mimicking the inherent surface undulation of the substrate are fabricated with a gauge factor of 151 over a linear strain range of ε = 97%.
Interactions of fatigue cracks with elastic obstacles
Publisher: Springer Science and Business Media LLC
Date: 2001
Fatigue crack closure analysis of bridged cracks representing composite repairs
Publisher: Wiley
Date: 06-2000
Self-healing of delamination fatigue cracks in carbon fibre-epoxy laminate using mendable thermoplastic
Publisher: Springer Science and Business Media LLC
Date: 17-02-2012
Improving the delamination resistance of fibre reinforced polymer composites using 3D woven metal Z-Filaments
Publisher: Elsevier BV
Date: 09-2012
Improving the structural properties of composite T-joints by z-weaving of continuous metallic filaments
Publisher: Elsevier BV
Date: 03-2021
Delamination toughening and healing performance of woven composites with hybrid z-fibre reinforcement
Publisher: Elsevier BV
Date: 07-2018
Stretchable strain sensors based on PDMS composites with cellulose sponges containing one- and two-dimensional nanocarbons
Publisher: Elsevier BV
Date: 08-2018
Efficient Simulations of the Nonlinear Wave Modulation Induced by a Closed Crack Using Local Contact Modelling
Publisher: Elsevier BV
Date: 2017
Direct 3D Printing of Highly Anisotropic, Flexible, Constriction-Resistive Sensors for Multidirectional Proprioception in Soft Robots
Publisher: American Chemical Society (ACS)
Date: 04-03-2020
A predictive creep model for un-stitched and stitched woven composites
Publisher: Elsevier BV
Date: 02-2000
Plastic yielding of a film adhesive under multiaxial stresses
Publisher: Elsevier BV
Date: 04-2000
Development of polymer composites using modified, high-structural integrity graphene platelets
Publisher: Elsevier BV
Date: 2014
Non-collinear shear wave mixing at a contact interface: Analytical modelling and parametric investigation
Publisher: DEStech Publications, Inc.
Date: 02-2028
A strain-based Dugdale model for cracks under generally yielding conditions
Publisher: Springer Science and Business Media LLC
Date: 2002
Inverse methods for quantitative assessment of delamination damage based on vibrational response
Publisher: SAGE Publications
Date: 07-2015
Abstract: A novel two-step approach for quantifying laminar damages, such as delaminations in composites, is presented. This new approach first employs the gapped smoothing method to locate the edges of damage from the vibrational curvature data, followed by an inverse method to determine the through-thickness location of delaminations that provide the best match with the local reduction in bending stiffness over the damaged region. Practical aspects of the implementation of this procedure are discussed, and the approach is demonstrated using both simulated and experimental data. The role of s le spacing on the accuracy of damage location is investigated systematically and it is shown that an optimum spacing exists for experimental data containing noise. The inverse method is found to be able to provide detailed information of delaminations when the searching space is limited, and it can also be used to determine the effective flexural stiffness for complex delamination damage.
Healing of carbon fibre-epoxy composites using thermoplastic additives
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3PY00459G
Ply-interleaving technique for joining hybrid carbon/glass fibre composite materials
Publisher: Elsevier BV
Date: 05-2016
The implementation of a constitutive model with weighted dynamic recovery and its application
Publisher: Springer Science and Business Media LLC
Date: 07-2003
A study of the crack wake closure/opening behaviour of short fatigue cracks and its influence on crack growth
Publisher: Elsevier BV
Date: 10-2005
Deformation and fracture of Macadamia nuts - Part 2: Microstructure and fracture mechanics analysis of nutshell
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1007/BF00032189
On the design methodology of scarf repairs to composite laminates
Publisher: Elsevier BV
Date: 2008
Deformation and fracture of Macadamia nuts - Part 1: Deformation analysis of nut-in-shell
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1007/BF00032188
Structural supercapacitor electrodes for energy storage by electroless deposition of MnO2 on carbon nanotube mats
Publisher: Elsevier BV
Date: 06-2023
Filling natural microtubules with triphenyl phosphate for flame-retarding polymer composites
Publisher: Elsevier BV
Date: 12-2018
Highly sensitive, stretchable and durable strain sensors based on conductive double-network polymer hydrogels
Publisher: Wiley
Date: 26-09-2020
DOI: 10.1002/POL.20200567
Strain Sensors with Adjustable Sensitivity by Tailoring the Microstructure of Graphene Aerogel/PDMS Nanocomposites
Publisher: American Chemical Society (ACS)
Date: 07-09-2016
Abstract: Strain sensors with high elastic limit and high sensitivity are required to meet the rising demand for wearable electronics. Here, we present the fabrication of highly sensitive strain sensors based on nanocomposites consisting of graphene aerogel (GA) and polydimethylsiloxane (PDMS), with the primary focus being to tune the sensitivity of the sensors by tailoring the cellular microstructure through controlling the manufacturing processes. The resultant nanocomposite sensors exhibit a high sensitivity with a gauge factor of up to approximately 61.3. Of significant importance is that the sensitivity of the strain sensors can be readily altered by changing the concentration of the precursor (i.e., an aqueous dispersion of graphene oxide) and the freezing temperature used to process the GA. The results reveal that these two parameters control the cell size and cell-wall thickness of the resultant GA, which may be correlated to the observed variations in the sensitivities of the strain sensors. The higher is the concentration of graphene oxide, then the lower is the sensitivity of the resultant nanocomposite strain sensor. Upon increasing the freezing temperature from -196 to -20 °C, the sensitivity increases and reaches a maximum value of 61.3 at -50 °C and then decreases with a further increase in freezing temperature to -20 °C. Furthermore, the strain sensors offer excellent durability and stability, with their piezoresistivities remaining virtually unchanged even after 10 000 cycles of high-strain loading-unloading. These novel findings pave the way to custom design strain sensors with a desirable piezoresistive behavior.
Stepped Flush Repairs for Primary Composite Structures
Publisher: Informa UK Limited
Date: 05-09-2014
Investigation of short fatigue cracks in nickel-based single crystal superalloy SC16 by in-situ SEM fatigue testing
Publisher: Elsevier BV
Date: 05-2001
Aluminum alloy 7075 ratcheting and plastic shakedown evaluation with the multiplicative armstrong-frederick model
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 07-2017
DOI: 10.2514/1.J055833
Numerical analysis of damage progression and strength of countersunk composite joints
Publisher: Elsevier BV
Date: 2012
Modulated high frequency excitation approach to nonlinear ultrasonic NDT
Publisher: Elsevier BV
Date: 04-2019
Nanoparticles of polydopamine for improving mechanical and flame-retardant properties of an epoxy resin
Publisher: Elsevier BV
Date: 04-2020
Minimum-Weight Sandwich Structure Optimum Design Subjected to Torsional Loading
Publisher: Springer Science and Business Media LLC
Date: 05-01-2011
Size-stable, smart impact-protective material fabricated via dual-network strategy with impact-hardening effect and self-healing ability
Publisher: Elsevier BV
Date: 06-2022
Toughening polymer adhesives using nanosized elastomeric particles
Publisher: Springer Science and Business Media LLC
Date: 11-03-2014
DOI: 10.1557/JMR.2014.34
Three-dimensional linear elastic distributions of stress and strain energy density ahead of V-shaped notches in plates of arbitrary thickness
Publisher: Springer Science and Business Media LLC
Date: 06-2004
Self-healing of delamination cracks in mendable epoxy matrix laminates using poly[ethylene-co-(methacrylic acid)] thermoplastic
Publisher: Elsevier BV
Date: 08-2012
Ultrasensitive and Stretchable Strain Sensors Based on Mazelike Vertical Graphene Network
Publisher: American Chemical Society (ACS)
Date: 26-09-2018
Abstract: Here, we report a new type of strain sensors consisting of vertical graphene nanosheets (VGNs) with mazelike network, sandwiched between poly(dimethylsiloxane) (PDMS) substrates. The new sensors outperform most graphene thin-film-based sensors reported previously and show an outstanding combination of high stretchability of ∼120%, excellent linearity over the entire detection range, and high sensitivity with a gauge factor of ∼32.6. The sensitivity can be tuned by controlling the thickness of VGNs, with sensors consisting of thicker VGNs showing higher sensitivity but slightly lower stretchability (the maximum gauge factor is ∼88.4 with a maximum detection strain of ∼55%). Detailed microscopic examinations reveal that the ultrahigh sensitivity stems from the formation of microcracks initiated in the buffer layer. These microcracks are bridged by strings of graphene/PDMS, enabling the conductive network to continue to function up to a strain level significantly higher than that of previously reported graphene thin-film-based sensors. Furthermore, the present sensors have been found to be insensitive to temperatures and various liquids, including water and 0.1 mol L
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University Of Sheffield
Location: United Kingdom of Great Britain and Northern Ireland
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