ORCID Profile
0000-0002-7302-9838
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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)
Mechanical Engineering | Composite and Hybrid Materials | Solid Mechanics | Engineering/Technology Instrumentation | Numerical Modelling and Mechanical Characterisation | Engineering And Technology Not Elsewhere Classified | Materials Engineering not elsewhere classified | Manufacturing Engineering | Mechanical Engineering | Infrastructure Engineering and Asset Management | Structural Engineering | Construction Materials | Civil Engineering | Textile Technology | Dynamics, Vibration and Vibration Control | Manufacturing Processes and Technologies (excl. Textiles) | Geomechanics and Resources Geotechnical Engineering | Interdisciplinary Engineering Not Elsewhere Classified | Metals and Alloy Materials | Heat and Mass Transfer Operations | Interdisciplinary Engineering |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Metals (e.g. Composites, Coatings, Bonding) | Scientific instrumentation | Air Safety | Other | Combined operations | Polymeric Materials (e.g. Paints) | Natural Fibres, Yarns and Fabrics | Synthetic Fibres, Yarns and Fabrics | Expanding Knowledge in Built Environment and Design | Fabricated Metal Products not elsewhere classified | Expanding Knowledge in Technology | Multimodal transport | Construction Materials Performance and Processes not elsewhere classified | Road Infrastructure and Networks | Cement Products and Concrete Materials
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Publications
Experimental characterization of multiple cracks in a cantilever beam utilizing transient vibration data following a probabilistic approach
Publisher: Elsevier BV
Date: 08-2007
Single-Plant Biocomposite from Ricinus Communis: Preparation, Properties and Environmental Performance
Publisher: Springer Science and Business Media LLC
Date: 27-07-2013
Flexural strength of weathered granites: Influence of freeze and thaw cycles
Publisher: Elsevier BV
Date: 12-2017
Probabilistic Damage Characterisation in Beams using Guided Waves
Publisher: Elsevier BV
Date: 2011
Closed crack imaging using time reversal method based on fundamental and second harmonic scattering
Publisher: Elsevier BV
Date: 11-2016
EXPERIMENTAL MEASUREMENT AND NUMERICAL SIMULATION OF FUNDAMENTAL ANTI-SYMMETRIC LAMB WAVE SCATTERING IN COMPOSITES
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3591858
Integrated piezoceramic transducers for imaging damage in composite laminates
Publisher: SPIE
Date: 25-07-2009
DOI: 10.1117/12.840150
Reflection of structural waves at a solid/liquid interface
Publisher: Elsevier BV
Date: 07-2003
DOI: 10.1016/S0041-624X(03)00122-7
Abstract: This paper investigates the reflection characteristics of structural or guided waves in rods at a solid/liquid interface. Structural waves, whose wavelengths are much larger than the diameter of the rod, are described in a first approximation by classical one-dimensional wave theory. The reflection characteristics of such waves at a solid/liquid (melting) interface has been reported by two different ultrasonic measurement techniques: first, measuring the fast regression rate of a melting interface during the burning of metal rod s les in an oxygen-enriched environment, and second, monitoring the propagation of the solid/liquid interface during the slow melting and solidification of a rod s le in a furnace. The second work clearly shows that the major reflection occurs from the solid/liquid interface and not the liquid/gas interface as predicted by plane longitudinal wave reflectivity theory. The present work confirms this observation by reporting on the results of some specially designed experiments to identify the main interface of reflection for structural waves in rods. Hence, it helps in explaining the fundamental discrepancy between the reflection characteristics at a solid/liquid interface between low frequency structural waves and high frequency bulk waves, and confirms that the detected echo within a burning metallic rod clearly represents a reflection from the solid/liquid interface.
Experimental and numerical analysis of drop-weight low-velocity impact tests on hybrid titanium composite laminates
Publisher: SAGE Publications
Date: 28-07-2016
Abstract: An experimental and numerical study on low-velocity impact responses on [Ti/0/90] s hybrid titanium composite laminates (HTCLs) is presented. Different energy levels from 10 to 40 J are investigated using a drop-weight instrument and post-impact inspection. An explicit finite element implementation provides a detailed analysis of impact response in composite and titanium layers, respectively. It accounts for interfacial debonding, progressive failure in composite plies and elastic–plastic deformation in titanium. The main failure modes are experimentally and numerically found to be debonding between titanium and composite, matrix cracking and interlaminar delamination. The principal energy-absorbing mechanism is plastic dissipation of the two titanium sheets. The low cost numerical model is able to effectively predict the overall impact response and major failure modes with good accuracy.
Local buckling of FRP thin-walled plates, shells and hollow sections with curved edges and arbitrary lamination
Publisher: Elsevier BV
Date: 11-2021
Pseudoelastic behaviour of cast magnesium AZ91 alloy under cyclic loading-unloading
Publisher: Elsevier BV
Date: 12-2003
Morphology of an interface between Polyetherimide and epoxy prepreg
Publisher: Trans Tech Publications, Ltd.
Date: 11-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.393-395.184
Abstract: The morphology of the interface between a commercial epoxy prepreg resin (HexPly M18/1) and Polyetherimide (PEI) is studied. Different cure cycles prescribed by the supplier were investigated to determine the influence of temperature and pressure on interface formation. Atomic Force Microscopy (AFM) was used as the main means of investigation. A phase-separated interphase spanning 9-10μm was observed for the PEI/epoxy prepreg interface. It was found that the temperature profile of the cure cycle strongly influences the formation of this interphase. Rapid formation of these relatively large interphase areas suggests that mechanisms other than diffusion are responsible for this phenomenon.
Microanalysis techniques for the investigation of interphases formed between thermoset and thermoplastic polymers: Scanning electron microscopy and energy dispersive x-ray analysis
Publisher: Trans Tech Publications, Ltd.
Date: 02-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.471-472.309
Abstract: Prepreg resin systems are typically of complex composition and require very specific manufacturing conditions. These characteristics restrict the use of some commonly used micro analysis techniques. This paper investigates the use of low acceleration voltage scanning electron microscopy and energy dispersive x-ray analysis for the characterization of diffused polymer interfaces. It is shown that, by operating at the dynamic charge balance, high resolution secondary electron images of polymer interfaces can be obtained and that conductive coating is not required. In addition, the effect of acceleration voltage on the interaction volume in EDX analysis is discussed using Monte Carlo simulation. X-ray intensity measurements in combination with afore mentioned Monte Carlo simulation is used to define practically obtainable spatial resolution limits. It is shown that by reducing the acceleration voltage below 5kV spatial resolution higher the 500nm can be obtained.
Analytical and numerical modelling of wave scattering by a linear and nonlinear contact interface
Publisher: Elsevier BV
Date: 09-2019
Evaluation of the mechanical compatibility of additively manufactured porous Ti–25Ta alloy for load-bearing implant applications
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.JMBBM.2019.05.019
Abstract: Integrating porous networks in load-bearing implants is essential in order to improve mechanical compatibility with the host tissue. Additive manufacturing has enabled the optimisation of the mechanical properties of metallic biomaterials, notably with the use of novel periodic regular geometries as porous structures. In this work, we successfully produced solid and lattice structures made of Ti-25Ta alloy with selective laser melting (SLM) using a Schwartz primitive unit-cell for the first time. The manufacturability and repeatability of the process was assessed through macrostructural and microstructural observations along with compressive testing. The mechanical properties are found to be suitable for bone replacement applications, showing significantly reduced elastic moduli, ranging from 14 to 36 GPa depending on the level of porosity. Compared to the conventionally used biomedical Ti-6Al-4V alloy, the Ti-Ta alloy offers superior mechanical compatibility for the targeted applications with lower elastic modulus, similar strength and higher ductility, making the Ti-25Ta alloy a promising candidate for a new generation of load-bearing implants.
Modelling the input–output behaviour of piezoelectric structural health monitoring systems for composite plates
Publisher: IOP Publishing
Date: 25-09-2003
Guided wave damage characterisation in beams utilising probabilistic optimisation
Publisher: Elsevier BV
Date: 12-2009
Transient bending of a piezoelectric circular plate
Publisher: Elsevier BV
Date: 12-2004
Analysis of flexural waves excited by rectangular contact type transducers
Publisher: Elsevier BV
Date: 09-2001
Ultrasonic in-situ determination of the regression rate of the melting interface in burning metal rods
Publisher: Acoustical Society of America (ASA)
Date: 03-1999
DOI: 10.1121/1.426741
Abstract: Results of tests in which metallic rods are burned in oxygen enriched atmospheres often include the determination of the regression rate of the melting interface for the burning test specimen. This regression rate is used as an indication of a metallic material’s relative flammability and its general ability to sustain burning under the test conditions. This paper reports on the development and first application of an ultrasonic measurement system that enables in situ measurement of the regression rate of the melting interface in burning metal rods. All other methods currently used for determining this parameter are based on posttest, visual interrogation, which is costly and often inaccurate. The transducer and associated equipment used to drive and record the transducer’s output signal are described and typical results for iron rods burning in pure oxygen at different gauge pressures are given along with a comparison of these results with regression rates obtained from visual interrogation. The excellent sensitivity, accuracy and reliability of the new ultrasonic transducer are demonstrated, thus indicating the transducer’s great potential.
Critical Aspects of Experimental Damage Detection Methodologies Using Nonlinear Vibro-ultrasonics
Publisher: Elsevier BV
Date: 2017
Statistical data for the tensile properties of natural fibre composites
Publisher: Elsevier BV
Date: 06-2017
A progressive analysis of matrix cracking-induced delamination in composite laminates using an advanced phantom node method
Publisher: SAGE Publications
Date: 22-12-2016
Abstract: Matrix cracking-induced delamination in composite laminates is qualitatively and quantitatively investigated in a finite element framework. The phantom node method is extended to incorporate breakable interfaces at transverse matrix crack tips. New user-defined element types in Abaqus improve the numerical stability in a geometrically nonlinear analysis. The new formulation allows for accurate prediction of matrix crack density and stiffness reduction in a number of composite laminates. Furthermore, the advanced phantom node method is able to simulate progressive matrix cracking-induced delamination with good accuracy.
The mechanical properties of natural fibre composite laminates: A statistical study
Publisher: Elsevier BV
Date: 07-2017
Mechanical and Tribological Performances of Thermoplastic Polymers Reinforced with Glass Fibres at Variable Fibre Volume Fractions
Publisher: MDPI AG
Date: 30-01-2023
Abstract: High wear rates and frictional coefficients have always been the primary reasons for limiting the service life of critical elements such as pumps, couplings, bushings, bearings and gears. The premature and erratic failures are costing the industries extensive amounts of money every year. Additionally, under severe service conditions, the wear resistance requirements are higher, which greatly hinders the application of neat thermoplastics in different sectors. Hence, it is vital to enhance the tribological characteristics of thermoplastics. The mechanical and tribological properties of Polyamide 6, Thermoplastic Polyurethane, and glass fibre reinforced (GFR) Polyadmide 6 Composites of variable fibre volume fractions were investigated. Pin specimens of Polyamide 6 reinforced with (25%, 33%, and 50%) by volume of fibres were fabricated by an injection moulding process. The specimens were tested for tensile, compression, hardness, and wear under dry abrasive conditions using a pin-on-disc setup. Furthermore, the s les were scanned using micro-computed tomography (micro-CT), and the worn-out s les were analysed using field emission scanning electron microscopy. The experimental results showed that the fibre volume fraction was inversely proportional to the wear resistance of the prepared composite materials. This research will enable the industry partners to supply cutting-edge technologies to the global oil and gas industry that not only minimizes the well running cost but also improves the well resilience.
Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates
Publisher: Acoustical Society of America (ASA)
Date: 03-2011
DOI: 10.1121/1.3533741
Abstract: An analysis of the scattering characteristics of the fundamental anti-symmetric (A0) Lamb wave at a delamination in a quasi-isotropic composite laminate is presented. Analytical solutions for this problem do not exist due to the anisotropic nature and multilayer characteristics of composite laminates. This study uses a three-dimensional finite element (FE) method and experimental measurements to provide physical insight into the scattering phenomena. Good agreement is found between simulations and experimental measurements. The results show that the A0 Lamb wave scattering at a delamination in composite laminates is much more complicated than the scattering at a defect in isotropic plates. Scatter litudes and scatter directivity distributions depend on the delamination size to wavelength ratio and the through-thickness location of the delamination damage. The study also investigates the feasibility of the common experimental practice of simulating delamination damage by bonding masses to the surface of composite laminates for guided wave damage detection and characterization methodologies verifications. The results suggest that care is required to use bonded masses to simulate delamination damage for verifying and optimizing damage characterization techniques. In summary, the results of the investigation help to further advance the use of the A0 Lamb wave for damage detection and characterization.
Measurements of interface fracture strength between fiber-reinforced composite laminates and thin surface films using the blister test
Publisher: Trans Tech Publications, Ltd.
Date: 02-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.471-472.315
Abstract: The blister test is a promising test method to determine the interface fracture toughness of thin films adhering to rigid fibre reinforced plastics. In this paper nonlinear finite element analysis is used to determine a suitable layout for both the shaft loaded and the pressurised blister test. On the ex le of a PET film adhering to a quasi-isotropic fibre reinforced plastic, it is shown that energy release rates in a range of 0-1500N/m can be obtained for a 0.5mm thick film if test parameters are carefully selected. The two main causes for deviations of the analytic solution from the FEA results is attributed to infringement of the membrane limit condition and plastic deformation in the film.
Influence of stacking sequence on scattering characteristics of the fundamental anti-symmetric Lamb wave at through holes in composite laminates
Publisher: Acoustical Society of America (ASA)
Date: 03-2011
DOI: 10.1121/1.3533742
Abstract: This paper investigates the scattering characteristics of the fundamental anti-symmetric (A0) Lamb wave at through holes in composite laminates. Three-dimensional (3D) finite element (FE) simulations and experimental measurements are used to study the physical phenomenon. Unidirectional, bidirectional, and quasi-isotropic composite laminates are considered in the study. The influence of different hole diameter to wavelength aspect ratios and different stacking sequences on wave scattering characteristics are investigated. The results show that litudes and directivity distribution of the scattered Lamb wave depend on these parameters. In the case of quasi-isotropic composite laminates, the scattering directivity patterns are dominated by the fiber orientation of the outer layers and are quite different for composite laminates with the same number of laminae but different stacking sequence. The study provides improved physical insight into the scattering phenomena at through holes in composite laminates, which is essential to develop, validate, and optimize guided wave damage detection and characterization techniques.
Experimental investigation of the acousto-ultrasonic transfer characteristics of adhesively bonded piezoceramic transducers
Publisher: IOP Publishing
Date: 02-2000
Modelling of Lamb waves in composite laminated plates excited by interdigital transducers
Publisher: Elsevier BV
Date: 10-2002
APPLICATION OF BAYESIAN APPROACH FOR DAMAGE CHARACTERIZATION IN BEAMS UTILIZING GUIDED WAVES
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3591918
Efficient Simulations of the Nonlinear Wave Modulation Induced by a Closed Crack Using Local Contact Modelling
Publisher: Elsevier BV
Date: 2017
Demodulation technique to identify nonlinear characteristics of vibro-acoustic NDT measurements
Publisher: Elsevier BV
Date: 02-2020
Modified time reversal imaging of a closed crack based on nonlinear scattering
Publisher: SPIE
Date: 15-04-2016
DOI: 10.1117/12.2219393
Fluorine mobility during SEM-EDX analysis: A challenge for characterizing epoxy/fluoropolymer interfaces
Publisher: American Chemical Society (ACS)
Date: 08-08-2013
DOI: 10.1021/JP403314T
The hyperelastic and failure behaviors of skin in relation to the dynamic application of microscopic penetrators in a murine model
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.ACTBIO.2016.10.021
Abstract: In-depth understanding of skin elastic and rupture behavior is fundamental to enable next-generation biomedical devices to directly access areas rich in cells and biomolecules. However, the paucity of skin mechanical characterization and lack of established fracture models limits their rational design. We present an experimental and numerical study of skin mechanics during dynamic interaction with in idual and arrays of micro-penetrators. Initially, micro-indentation of in idual skin strata revealed hyperelastic moduli were dramatically rate-dependent, enabling extrapolation of stiffness properties at high velocity regimes (>1ms The mechanics of skin penetration by dynamically-applied microscopic tips is investigated using a combined experimental-computational approach. A FE model of skin is parameterized using indentation tests and a ductile-failure implementation validated against penetration assays. The simulations shed light on skin elastic and fracture properties, and elucidate the interaction with microprojection arrays for vaccine delivery allowing rational design of next-generation devices.
Analysis of acousto-ultrasonic characteristics for contact-type transducers coupled to composite laminated plates
Publisher: Elsevier BV
Date: 06-2001
Prediction and Measurement of Lamb Wave from Debondings at Structural Features in Composite Laminates
Publisher: Trans Tech Publications, Ltd.
Date: 06-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.558.139
Abstract: The interaction of the fundamental anti-symmetric Lamb wave (A 0 ) with debondings at structural features is investigated using experimental data and finite element (FE) simulations. In this study explicit three-dimensional (3D) FE simulations are employed, which allows the study of the scattered wave along different propagation directions. Good agreement between the FE predictions and the measurements are obtained that demonstrates that the 3D FE scattering model is able to accurately predict the Lamb wave scattering characteristics at debondings. The study show that the characteristics of Lamb wave reflected from the debondings at the structure feature is much more complicated than that from defects in flat composite laminates. Parameter studies show that the backward and forward scattering coefficient of Lamb wave is a function of debonding size to wavelength ratio and debonding location. This shows the potential of employing Lamb wave to identify the size and monitor the growth of the debondings. The findings of the study provide improved physical insights into the scattering phenomena, which are important to further advance damage detection techniques for complex structures made by composite laminates.
Particle swarm optimization for optimal sensor placement in ultrasonic SHM systems
Publisher: SPIE
Date: 08-04-2016
DOI: 10.1117/12.2219396
Buckle interaction in deep subsea pipelines
Publisher: Elsevier BV
Date: 11-2013
Time reversal invariance for a one-dimensional model of contact acoustic nonlinearity
Publisher: Elsevier BV
Date: 04-2017
Failure Modes in Hybrid Titanium Composite Laminates
Publisher: ASME International
Date: 09-08-2017
DOI: 10.1115/1.4037273
Abstract: Hybrid titanium composite laminates (HTCLs) combine the benefits of thin titanium sheets and fiber-reinforced polymer (FRP) composite laminates to design high performance light-weight materials with optimized impact resistance, fracture toughness, durability, and/or thermal performance. This paper starts with a detailed review of typical failure modes observed in HTCLs. The critical manufacturing process of thin grade II titanium sheets combined with HexPly G947/M18 carbon fiber-reinforced polymer laminates is described in detail. This includes the evaluation of titanium surface preparation techniques, which guarantee good adhesive bonding. A systematic experimental study of different HTCL configurations under tensile loading confirms that the major failure modes are debonding between the titanium sheet and the FRP laminate, matrix cracking in the 90 deg plies of the FRP laminate and interlaminar delamination. The results show that HTCLs made from woven carbon FRP plies show higher ultimate strengths and strain at breaks than HTCLs containing a cross-ply composite core made from unidirectional (UD) prepreg.
An experimental and finite element poroelastic creep response analysis of an intervertebral hydrogel disc model in axial compression
Publisher: Springer Science and Business Media LLC
Date: 07-2005
DOI: 10.1007/S10856-005-2538-0
Abstract: A hydrogel intervertebral disc (IVD) model consisting of an inner nucleus core and an outer anulus ring was manufactured from 30 and 35% by weight Poly(vinyl alcohol) hydrogel (PVA-H) concentrations and subjected to axial compression in between saturated porous endplates at 200 N for 11 h, 30 min. Repeat experiments (n=4) on different s les (N=2) show good reproducibility of fluid loss and axial deformation. An axisymmetric nonlinear poroelastic finite element model with variable permeability was developed using commercial finite element software to compare axial deformation and predicted fluid loss with experimental data. The FE predictions indicate differential fluid loss similar to that of biological IVDs, with the nucleus losing more water than the anulus, and there is overall good agreement between experimental and finite element predicted fluid loss. The stress distribution pattern indicates important similarities with the biological IVD that includes stress transference from the nucleus to the anulus upon sustained loading and renders it suitable as a model that can be used in future studies to better understand the role of fluid and stress in biological IVDs.
A simple resonant method that can simultaneously measure elastic modulus and density of thin films
Publisher: Elsevier BV
Date: 09-2012
Analytical and finite element prediction of Lamb wave scattering at delaminations in quasi-isotropic composite laminates
Publisher: Elsevier BV
Date: 10-2012
A Lamb-wave-based technique for damage detection in composite laminates
Publisher: IOP Publishing
Date: 15-06-2009
Time reversal invariance for a nonlinear scatterer exhibiting contact acoustic nonlinearity
Publisher: Elsevier BV
Date: 03-2018
The influence of backward wave transmission on quantitative ultrasonic evaluation using Lamb wave propagation
Publisher: Acoustical Society of America (ASA)
Date: 2000
DOI: 10.1121/1.428348
Abstract: In view of the various novel quantitative ultrasonic evaluation techniques developed using Lamb wave propagation, the influence of an important related phenomenon, backward transmission, is investigated in this paper. Using the discrete layer theory and a multiple integral transform method, the surface displacement and velocity responses of isotropic plates and cross-ply laminated composite plates due to the Lamb waves excited by parabolic- and piston-type transmitting transducers are evaluated. Analytical expressions for the surface displacement and velocity frequency response functions are developed. Based on this a large volume of calculations is carried out. Through examining the characteristics of the surface displacement and velocity frequency response functions and, especially, the different propagation modes’ contributions to them, the influence of the backward wave transmission related to quantitative ultrasonic nondestructive evaluation applications is discussed and some important conclusions are drawn.
Scattering characteristics of Lamb waves from debondings at structural features in composite laminates
Publisher: Acoustical Society of America (ASA)
Date: 07-2012
DOI: 10.1121/1.4728192
Abstract: This article investigates the scattering characteristics of Lamb waves from a debonding at a structural feature in a composite laminate. This study specifically focuses on the use of the low frequency fundamental antisymmetric (A0) Lamb wave as the incident wave for debonding detection. Three-dimensional finite element (FE) simulations and experimental measurements are used to investigate the scattering phenomena. Good agreement is obtained between the FE simulations and experimental results. Detailed parameter studies are carried out to further investigate the relationship between the scattering litudes and debonding sizes. The results show that the litude of the scattered A0 Lamb wave is sensitive to the debonding size, which indicates the potential of using the low frequency A0 Lamb wave as the interrogating wave for debonding detection and monitoring. The findings of the study provide improved physical insights into the scattering phenomena, which are important to further advance damage detection techniques and optimize transducer networks.
Determination of the regression rate of a fast moving solid/liquid interface using ultrasonics
Publisher: Elsevier BV
Date: 04-2001
DOI: 10.1016/S0041-624X(00)00067-6
Abstract: This paper reports on an ultrasonic measurement system and its application for in situ real-time measurement of very fast regression rates (>200 mm/s) of the melting interface (RRMI) produced when burning particular metals such as aluminium at high pressures. The RRMI is referred to as the rate at which a solid/liquid interface moves along a metallic rod while burning in an oxygen-enriched atmosphere. The ultrasonic transducer and associated equipment used to drive and record the transducer's output signal and conversion of this output into a regression rate is described. Aluminium rods were burned in pure gaseous oxygen at pressures up to 69 MPa (10,000 psia) where the RRMI was calculated at 204+/-2 mm/s. Other tests with a variety of s le materials, geometric shapes and test conditions were also conducted. The resulting RRMI's calculated with the ultrasonic measurement system compare excellently with rates obtained using a visual review of the same tests and with published results (where available).
Finite element analysis of porous commercially pure titanium for biomedical implant application
Publisher: Elsevier BV
Date: 05-2018
Flexural waves transmitted by rectangular piezoceramic transducers
Publisher: IOP Publishing
Date: 18-07-2001
Influence of nonlinearities on the accuracy of the analytical solution for the shaft loaded blister test
Publisher: Elsevier BV
Date: 05-2011
Composite Springs for Mooring Tensioners: A Systematic Review of Material Selection, Fatigue Performance, Manufacturing, and Applications
Publisher: MDPI AG
Date: 12-09-2022
DOI: 10.3390/JMSE10091286
Abstract: Ocean energy is an underutilized renewable energy source compared with hydropower and wind power. Therefore, the development of economical and efficient wave energy converters (WECs) is important and crucial for offshore power generation. The mooring tensioner is a critical device that can be used in point-absorber-type WECs, semisubmersible floats for oil and gas drilling, and floating wind turbines. A mooring tensioner is a system used to create, reduce, or maintain tension within the mooring lines by applying a force to the mooring line. Composite springs as mooring tensioners have several advantages compared to metal springs, such as corrosion resistance, high specific strain energy, appropriate fatigue performance, and the ability to flexibly adjust the spring constant without changing the overall dimensions. This paper reviews in detail the fatigue performance, seawater durability, and manufacturing methods of different composite materials as well as the current and potential applications of composites springs. In addition, recommendations for future research and opportunities for composite mooring tensioners are presented.
Forced Response Analysis of Supercritical CO2 Radial Inflow Turbine Designed for Concentrating Solar Power
Publisher: American Society of Mechanical Engineers
Date: 13-06-2016
DOI: 10.1115/GT2016-58144
Abstract: The forced response of high-pressure sCO2 radial-inflow turbine blisk is studied with regards to internal mistuning and inherent characteristics of supercritical Brayton cycle. A novel preliminary meanline analysis led to the generation of turbine designs for the sCO2 Brayton cycle with respect to concentrating solar power (CSP) applications. Details of mentioned study are published in a separate paper. The sCO2 turbine with a pressure ratio of 2.2 and the mild inlet temperature of 560 C is studied for rotational speed ranging between 75000 and 125000 RPM. Aiming to achieve an enhanced understanding of the fluid-structure-interaction in sCO2 radial-inflow turbine, a numerical method capable of predicting the forced responses of tuned and intentionally mistuned blisks due to aerodynamic excitation is presented. The numerical work involves the simulation of the transient flow field, and then the unsteady aerodynamic excitation forces on the blades are determined by modelling various resonance condition, including the influence of the operating condition and stator number. Performing the forced response of the structure, the transient and spatially resolved pressure distribution is used as a boundary condition in an FE model. As a result, the response lifications of sCO2 turbines are eventually compared. The similar geometrical turbine was designed and manufactured to be operated in subcritical state for the sake of validation. The results of the subcritical turbine are derived by means of experimental and numerical analyses. To update the effect of mistuning in the FE model, blade by blade measurements using the ex le of a subcritical turbine blisk is performed and results of well correlated FRFs are used as inputs to adjust the blade in idual Young’s modulus. The tendency of results is approved by previous works done in subcritical state. The structural d ing information to be considered in the update process is taken from results of an experimental modal analysis and the aerodynamic d ing induced by blade vibration is computed using an energy balance technique. It has been found that increase of the maximum forced response beyond that of the sCO2 turbine with higher rotational speed is not significant due to the existence of high pressure-density sCO2. This implies an occurrence of high aerodynamic d ing which would cause a low vibrational litude in case of a mistuned blisk. Considering aeroelastic coupling, in supercritical turbine with small mistuning, no change of maximum response magnitudes is achieved for the fundamental bending mode however, with large mistuning pattern, aerodynamic d ing can cause significantly better response level. This result indicates considerable contrast with responses obtained from subcritical model which would be expressed by either characteristic or state of working fluid.
Modulated high frequency excitation approach to nonlinear ultrasonic NDT
Publisher: Elsevier BV
Date: 04-2019
The elastic modulus of cast Mg-Al-Zn alloys
Publisher: Elsevier BV
Date: 02-2002
A novel Top Surface Analysis method for Mode I interface characterisation using Digital Image Correlation
Publisher: Elsevier BV
Date: 03-2017
Single mode Lamb waves in composite laminated plates generated by piezoelectric transducers
Publisher: Elsevier BV
Date: 11-2002
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