ORCID Profile
0000-0003-4285-5181
Current Organisations
Københavns Universitet
,
Australian Nuclear Science and Technology Organisation
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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)
Nanomaterials | Crop and Pasture Nutrition | Crop and Pasture Production
ANZSRC Socio-Economic Objective (SEO)
Related Links
Publications
Evaluation of surface treatments on 5052-H32 aluminum alloy for enhancing the interfacial adhesion of thermoplastic-based fiber metal laminates
Publisher: Elsevier BV
Date: 04-2018
Numerical investigation of the impact behaviour of bioinspired nacre-like aluminium composite plates
Publisher: Elsevier BV
Date: 05-2014
Grain size dependent microstructure and texture evolution during dynamic deformation of nanocrystalline face-centered cubic materials
Publisher: Elsevier BV
Date: 09-2021
Effect of structurally-induced lateral confinement on split Hopkinson pressure bar test specimens of concrete-like materials
Publisher: EDP Sciences
Date: 2015
Experimental and numerical determination of mechanical properties of polygonal wood particles and their flow analysis in silos
Publisher: Springer Science and Business Media LLC
Date: 17-09-2013
Ballistic performance of thermoplastic composite laminates made from aramid woven fabric and polypropylene matrix
Publisher: Elsevier BV
Date: 06-2012
Mechanical Characterization of Foamed Concrete Reinforced with Natural Fibre
Publisher: Materials Research Forum LLC
Date: 30-10-2018
Inferring More from Less: Prospector as a Photometric Redshift Engine in the Era of JWST
Publisher: American Astronomical Society
Date: 02-2023
Abstract: The advent of the James Webb Space Telescope (JWST) signals a new era in exploring galaxies in the high- z universe. Current and upcoming JWST imaging will potentially detect galaxies at z ∼ 20, creating a new urgency in the quest to infer accurate photometric redshifts (photo- z ) for in idual galaxies from their spectral energy distributions, as well as masses, ages, and star formation rates. Here we illustrate the utility of informed priors encoding previous observations of galaxies across cosmic time in achieving these goals. We construct three joint priors encoding empirical constraints of redshifts, masses, and star formation histories in the galaxy population within the Prospector Bayesian inference framework. In contrast with uniform priors, our model breaks an age–mass–redshift degeneracy, and thus reduces the mean bias error in masses from 0.3 to 0.1 dex, and in ages from 0.6 to 0.2 dex in tests done on mock JWST observations. Notably, our model recovers redshifts at least as accurately as the state-of-the-art photo- z code EAzY in deep JWST fields, but with two advantages: tailoring a model based on a particular survey is rendered mostly unnecessary given well-motivated priors obtaining joint posteriors describing stellar, active galactic nuclei, gas, and dust contributions becomes possible. We can now confidently use the joint distribution to propagate full non-Gaussian redshift uncertainties into inferred properties of the galaxy population. This model, “ Prospector - β ,” is intended for fitting galaxy photometry where the redshift is unknown, and will be instrumental in ensuring the maximum science return from forthcoming photometric surveys with JWST. The code is made publicly available online as a part of Prospector 9 9 The version used in this work corresponds to the state of the Git repository at commit d-j rospector/commit/820ad72363a1f9c22cf03610bfe6e361213385cd . .
A Technique for the Elimination of Stress Waves Overlapping in the Split Hopkinson Pressure bar
Publisher: Springer Science and Business Media LLC
Date: 03-04-2017
High Strain Rate Compressive Behaviour of Selective Laser Melted Ti-6Al-4V
Publisher: Trans Tech Publications, Ltd.
Date: 03-2017
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.890.323
Abstract: Ti-6Al-4V alloy is one of the most important engineering alloys, combining attractive properties with inherent workability. The aim of this study is to investigate the effect of strain rate on the compressive mechanical properties of Ti6Al4V alloy manufactured by a selective laser melting process. The mechanical tests were performed by means of a compression split Hopkinson pressure bar apparatus under high strain rate ranging from 1400 s -1 to 4500 s -1 . The true stress-strain curves obtained from static and dynamic compressive tests show strain rate sensitivity from quasi-static (peak strength 1300MPa) to high strain rate (peak 1500 MPa). Within the high strain rate range tested, the strain rate sensitivity is not remarkable. The fractographic analysis shows a relatively smooth and smeared fractured surface along with a dimple like structure. The observation of elongated dimples confirms the operation of a dynamic shear failure mechanism for the additively manufactured Ti-6Al-4V parts.
Megapixel imaging of (micro)nutrients in mature barley grains
Publisher: Oxford University Press (OUP)
Date: 05-09-2010
DOI: 10.1093/JXB/ERQ270
FEM-CFD Simulation and Experimental Study of Compound Parabolic Concentrator (CPC) Solar Collectors with and without Fins for Residential Applications
Publisher: MDPI AG
Date: 20-04-2021
DOI: 10.3390/APP11083704
Abstract: Compound parabolic concentrator (CPC) solar collectors are widely used for solar energy systems in industry however, CPC collectors for residential applications have not been fully investigated. In this work, the thermal performance of non-tracking, small-size and low-cost CPC collectors with an absorber with and without segmented fins was studied experimentally and by means of a proposed numerical methodology that included ray tracing simulation and a coupled heat transfer finite element method (FEM)-computational fluid dynamics (CFD) simulation, which was validated with experimental data. The experimental results showed that the CPC with a finned absorber has better thermal performance than that of the CPC with absorber without fins, which was attributed to the increase in thermal energy on the absorber surface. The numerical results showed that ray tracing simulation can be used to estimate the heat flux on the absorber surface and the FEM-CFD simulation can be used to estimate the heat transfer from the absorber to the water running through the pipe along with its temperature. The numerical results showed that mass flow rate is an important parameter for the design of the CPC collectors. The numerical methodology developed in this work was capable of describing the thermal performance of the CPC collectors and can be used for the modeling of the thermal behavior of other CPCs solar systems.
Static friction between rigid fractal surfaces
Publisher: American Physical Society (APS)
Date: 17-09-2015
Foliar application of zinc sulphate and zinc EDTA to wheat leaves: differences in mobility, distribution, and speciation
Publisher: Oxford University Press (OUP)
Date: 21-06-2018
DOI: 10.1093/JXB/ERY236
Hard projectile penetration and trajectory stability
Publisher: Elsevier BV
Date: 10-2011
Tensile Behavior of 3D Printed Polylactic Acid (PLA) Based Composites Reinforced with Natural Fiber
Publisher: MDPI AG
Date: 23-09-2022
Abstract: Natural fiber-reinforced composite (NFRC) filaments for 3D printing were fabricated using polylactic acid (PLA) reinforced with 1–5 wt% henequen flour comprising particles with sizes between 90–250 μm. The flour was obtained from natural henequen fibers. NFRCs and pristine PLA specimens were printed with a 0° raster angle for tension tests. The results showed that the NFRCs’ measured density, porosity, and degree of crystallinity increased with flour content. The tensile tests showed that the NFRC Young’s modulus was lower than that of the printed pristine PLA. For 1 wt% flour content, the NFRCs’ maximum stress and strain to failure were higher than those of the printed PLA, which was attributed to the henequen fibers acting as reinforcement and delaying crack growth. However, for 2 wt% and higher flour contents, the NFRCs’ maximum stress was lower than that of the printed PLA. Microscopic characterization after testing showed an increase in voids and defects, with the increase in flour content attributed to particle agglomeration. For 1 wt% flour content, the NFRCs were also printed with raster angles of ±45° and 90° for comparison the highest tensile properties were obtained with a 0° raster angle. Finally, adding 3 wt% content of maleic anhydride to the NFRC with 1 wt% flour content slightly increased the maximum stress. The results presented herein warrant further research to fully understand the mechanical properties of printed NFRCs made of PLA reinforced with natural henequen fibers.
Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates
Publisher: Wiley
Date: 11-11-2019
DOI: 10.1002/APP.48701
Mechanical Properties of Natural Fiber Reinforced Foamed Concrete
Publisher: MDPI AG
Date: 08-07-2020
DOI: 10.3390/MA13143060
Abstract: The mechanical characterization of plain foamed concrete (PFC) and fiber-reinforced foamed concrete (FRFC) with a density of 700 kg/m3 was performed with compression and tension tests. FRFC was reinforced with the natural fiber henequen (untreated or alkaline-treated) at volume fractions of 0.5%, 1% and 1.5%. Polypropylene fiber reinforcement was also used as a reference. For all FRFCs, the inclusion of the fibers enhanced the compressive and tensile strengths and plastic behavior, which was attributed to the increase of specimen integrity. Under compressive loading, after the peak strength, there was no considerable loss in strength and a plateau-like regime was observed. Under tensile loading, the fibers significantly increased the tensile strength of the FRFCs and prevented a sudden failure of the specimens, which was in contrast to the brittle behavior of the PFC. The tensile behavior enhancement was higher when treated henequen fibers were used, which was attributed to the increase in the fiber–matrix bond produced by the alkaline treatment. The microscopic characterization showed that the inclusion of fibers did not modify the air-void size and its distribution. Higher energy absorption was observed for FRFCs when compared to the PFC, which was attributed to the enhanced toughness and ductility by the fibers. The results presented herein warrant further research of FRFC with natural henequen fibers for engineering applications.
Discrete element simulation of dynamic behaviour of partially saturated sand
Publisher: Springer Science and Business Media LLC
Date: 13-08-2016
The effect of microstructure and welding-induced plasticity on the strength of Ni–Mo–Cr alloy welds
Publisher: Elsevier BV
Date: 06-2021
Photoelastic and numerical analyses of the stress distribution around a fiber in a pull‐out test for a thermoplastic fiber/epoxy resin composite
Publisher: Wiley
Date: 29-12-2017
DOI: 10.1002/PC.24709
Shaking Table Test of U-Shaped Walls Made of Fiber-Reinforced Foamed Concrete
Publisher: MDPI AG
Date: 03-06-2020
DOI: 10.3390/MA13112534
Abstract: Fiber-reinforced foamed concrete (FRFC) is a lightweight material that has the potential to perform well in seismic applications due to its low density and improved mechanical properties. However, studies focused on the seismic assessment of this material are limited. In this work, U-shaped wall specimens, made of FRFC reinforced with henequen fibers and plain foamed concrete (PFC) with a density of 900 kg/m3, were subjected to shaking table tests. PFC and FRFC were characterized using compression and tension tests. FRFC exhibited enhanced mechanical properties, which were attributed to the fibers. The dynamic tests showed that U-shaped walls made of FRFC performed better than those made of PFC. The time period prior to the collapse of the FRFC U-shaped walls was longer than that of the PFC specimens, which was attributed to the enhanced specimen integrity by the fibers. Finite element simulations of the shaking table test allowed for the prediction of the stress concentration and plastic strain that may lead to the failure of the U-shaped wall. These results showed that U-shaped walls made of FRFC have the potential to perform well in seismic applications, however, these results are preliminary and further studies are needed to support the findings of this work.
Structural behaviour of composite sandwich panels with plain and fibre-reinforced foamed concrete cores and corrugated steel faces
Publisher: Elsevier BV
Date: 04-2012
Experimental and Numerical Study of the Mechanical Behavior of a Commercial Polypropylene Woven Fabric
Publisher: Materials Research Forum LLC
Date: 30-10-2018
Photoelastic evaluation of fiber surface-treatments on the interfacial performance of a polyester fiber/epoxy model composite
Publisher: Elsevier BV
Date: 08-2011
A numerical study of bioinspired nacre-like composite plates under blast loading
Publisher: Elsevier BV
Date: 08-2015
Mechanical Characterization of Plaster Reinforced with Recycled Cellulose Fiber from Multi-Layer Packaging Waste for Construction Applications
Publisher: Materials Research Forum LLC
Date: 30-10-2018
Optimising the foliar uptake of zinc oxide nanoparticles: Do leaf surface properties and particle coating affect absorption?
Publisher: Wiley
Date: 09-09-2020
DOI: 10.1111/PPL.13167
Foliar‐applied manganese and phosphorus in deficient barley: Linking absorption pathways and leaf nutrient status
Publisher: Wiley
Date: 07-2022
DOI: 10.1111/PPL.13761
Abstract: Foliar fertilization delivers essential nutrients directly to plant tissues, reducing excessive soil fertilizer applications that can lead to eutrophication following nutrient leaching. Foliar nutrient absorption is a dynamic process affected by leaf surface structure and composition, plant nutrient status, and ion physicochemical properties. We applied multiple methods to study the foliar absorption behaviors of manganese (Mn) and phosphorus (P) in nutrient‐deficient spring barley ( Hordeum vulgare ) at two growth stages. Nutrient‐specific chlorophyll a fluorescence assays were used to visualize leaf nutrient status, while laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) was used to visualize foliar absorption pathways for P and Mn ions. Rapid Mn absorption was facilitated by a relatively thin cuticle with a low abundance of waxes and a higher stomatal density in Mn‐deficient plants. Following absorption, Mn accumulated in epidermal cells and in the photosynthetically active mesophyll, enabling a fast (6 h) restoration of Mn‐dependent photosynthetic processes. Conversely, P‐deficient plants developed thicker cuticles and epidermal cell walls, which reduced the penetration of P across the leaf surface. Foliar‐applied P accumulated in trichomes and fiber cells above leaf veins without reaching the mesophyll and, as a consequence, no restoration of P‐dependent photosynthetic processes was observed. This study reveals new links between leaf surface morphology, foliar‐applied ion absorption pathways, and the restoration of affected physiological processes in nutrient‐deficient leaves. Understanding that ions may have different absorption pathways across the leaf surface is critical for the future development of efficient fertilization strategies for crops in nutrient‐limited soils.
Study of the porosity of calcified chicken eggshell using atomic force microscopy and image processing
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.MICRON.2018.12.008
Abstract: In this work, the porosity of the layers of calcified chicken eggshell (vertical crystal layer VCL, palisade layer PL and mammillary layer ML) was evaluated using atomic force microscopy (AFM) and image processing (IP). AFM topographic images were obtained from different locations for each layer and along the cross-section of calcified eggshell. Roughness parameters, surface area values, pore size and shape, surface porosity, area occupied by pores and pore density were obtained from AFM and IP. It was observed that the thickest layer (PL) exhibited the highest degree of porosity (surface porosity = 2.75 ± 1.68%, pore density = 162 ± 60 pores/μm
NUMERICAL SIMULATIONS OF QUASI-STATIC INDENTATION AND LOW VELOCITY IMPACT OF ROHACELL 51 WF FOAM
Publisher: World Scientific Pub Co Pte Ltd
Date: 11-2014
DOI: 10.1142/S0219876213440040
Abstract: Numerical simulations of quasi-static indentation and low velocity impact of low density polymethacrylimide (PMI) Rohacell 51 WF foam using indenters with different nose shapes (conical, truncated-conical, hemi-spherical and flat) were carried out using the finite element code LS-DYNA. A 2D axisymmetric model was generated. A strain-rate dependent material model and r-adaptive remeshing were used for low velocity impact simulations. Numerical predictions matched the available experimental data very well. Moreover, the predicted resistance force closely matched the empirical results. The results demonstrated the ability of the model to reproduce the deformation mechanisms of the penetration process of Rohacell 51 WF foam.
Modelling wrinkling interactions produced by patterned defects in metal thin films
Publisher: Elsevier BV
Date: 09-2015
Ballistic Behavior of Bioinspired Nacre-like Composites
Publisher: MDPI AG
Date: 08-2023
DOI: 10.3390/BIOMIMETICS8040341
Abstract: In this paper, the ballistic performance of a multilayered composite inspired by the structural characteristics of nacre is numerically investigated using finite element (FE) simulations. Nacre is a natural composite material found in the shells of some marine mollusks, which has remarkable toughness due to its hierarchical layered structure. The bioinspired nacre-like composites investigated here were made of five wavy aluminum alloy 7075-T651 (AA7075) layers composed of ~1.1-mm thick square tablets bonded together with toughened epoxy resin. Two composite configurations with continuous layers (either wavy or flat) were also studied. The ballistic performance of the composite plates was compared to that of a bulk monolithic AA7075 plate. The ballistic impact was simulated in the 300–600 m/s range using two types of spherical projectiles, i.e., rigid and elastoplastic. The results showed that the nacre plate exhibited improved ballistic performance compared to the bulk plate and the plates with continuous layers. The structural design of the nacre plate improved the ballistic performance by producing a more ductile failure and enabling localized energy absorption via the plastic deformation of the tablets and the globalized energy dissipation due to interface debonding and friction. All the plate configurations exhibited a better ballistic performance when impacted by an elastoplastic projectile compared to a rigid one, which is explained by the projectile plastic deformation absorbing some of the impact energy and the enlarged contact area between the projectile and the plates producing more energy absorption by the plates.
Thermal and mechanical properties of PLA-based multiscale cellulosic biocomposites
Publisher: Elsevier BV
Date: 05-2022
Losses of essential mineral nutrients by polishing of rice differ among genotypes due to contrasting grain hardness and mineral distribution
Publisher: Elsevier BV
Date: 09-2012
Low velocity impact behaviour and mechanical properties of sandwich panels with cores made from Tetra Pak waste
Publisher: Elsevier BV
Date: 2023
Numerical analysis of the effect of weld-induced residual stress and plastic damage on the ballistic performance of welded steel plate
Publisher: Elsevier BV
Date: 06-2012
Finite element analysis of indentation of aluminium foam and sandwich panels with aluminium foam core
Publisher: Elsevier BV
Date: 04-2014
Finite-Element Modelling of the Impact Behaviour of Aluminium Nacre-Like Composite
Publisher: Trans Tech Publications, Ltd.
Date: 06-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.566.457
Abstract: The demand for energy-absorbing lightweight structures for impact applications in automotive, aerospace and defence industry is rapidly growing, posing a challenge for innovative engineering design to maintain lightweight without reducing damage tolerance and impact and shock absorption. In this context, biological materials offer a source of inspiration for the design of new materials. Nacre, commonly known as the mother-of-pearl, is a biological material that exhibits outstanding mechanical properties due to its hierarchical structure, which includes a brick-like pattern, layer waviness and interface. Although nacre is made of 95% of aragonite, a brittle material, its toughness is about 3000 larger than that of aragonite. Research addressing the behaviour of nacre-like engineering composites is limited and this work intends to contribute to the understanding of such materials under impact loading. In this paper, the study of the impact behaviour of layered nacre-like plates made of 1-mm thick tablets of aluminium alloy 7075 glued with toughened epoxy resin is performed using Abaqus/Explicit. A 9-mm steel spherical projectile with initial impact velocities in the range of 400-900 m/s is used. The epoxy material is modelled using a user-defined cohesive element that accounts for the experimentally observable increase in both strength and toughness in compression. Target thicknesses of 5 and 7 mm are modelled. The ballistic performance of bulk plates made of bulk Al-7075 is compared with that of nacre-like composite plates of the same thickness. It is found that the nacre-like structures performed slightly better than the bulk plate for high impact velocities with a reduction of about 9% in the residual velocity however, for lower impact velocities close to the ballistic limit, nacre-like plates performed worse than the bulk plate. The higher performance at higher impact velocities of the nacre-like composites is attributed to the hierarchical structure that enables both localized energy absorption by deformation of the metallic tablet and tablet interlocking due to the waviness and inter-layered delamination, which allows plastic deformation further away from the impact zone. It is concluded that nacre-like aluminium composite plates should be further investigated for their potential in designing protective structures because they could enable substantial improvements in weight-savings and in the ballistic performance of the structure. However, a quantitative assessment of their benefit warrants further numerical and experimental research.
Mechanical properties in crumple-formed paper derived materials subjected to compression
Publisher: Elsevier BV
Date: 06-2017
Effect of Recycled Polystyrene/Limonene Coating on the Mechanical Properties of Kraft Paper: A Comparative Study with Commercial Coatings
Publisher: Springer Science and Business Media LLC
Date: 02-04-2020
Experimental study of the indentation of sandwich panels with carbon fibre-reinforced polymer face sheets and polymeric foam core
Publisher: Elsevier BV
Date: 07-2011
Progressive fracture testing of Carbon–Carbon composites
Publisher: Elsevier BV
Date: 02-2023
Ballistic performance of multi-layered metallic plates impacted by a 7.62-mm APM2 projectile
Publisher: Elsevier BV
Date: 12-2011
The use of DGT for prediction of plant available copper, zinc and phosphorus in agricultural soils
Publisher: Springer Science and Business Media LLC
Date: 13-05-2011
Degradation of Elastic Modulus of Progressively Crushable Foams in Uniaxial Compression
Publisher: SAGE Publications
Date: 09-2008
Abstract: The degradation of apparent modulus in progressively crushable foams in uniaxial compression is studied in this article based on an analysis of the measurement of engineering strain. It shows that the deformation mechanism of the progressive collapse of the foam causes the non-uniform deformation in the foam during uniaxial compression, which leads to the decrease of apparent elastic modulus with the increase of strain in the plateau stress regime. Theoretical predictions are compared with experimental results for different closed-cell polymeric foams with satisfactory agreement. It is also shown that this method is not applicable to the in-plane compression of honeycombs and the numerical modeling based on macroscopic constitutive equation is incapable of predicting the degradation of apparent modulus in progressively crushable foams.
A brief note on the counter-intuitive region of a square plate
Publisher: Elsevier BV
Date: 02-2011
Indentation into polymeric foams
Publisher: Elsevier BV
Date: 08-2010
Ballistic performance of bioinspired nacre-like aluminium composite plates
Publisher: Elsevier BV
Date: 11-2019
Experimental and Numerical Study of Plain-Woven Aramid Fabric
Publisher: Trans Tech Publications, Ltd.
Date: 12-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.856.74
Abstract: In this paper, the tensile properties of plain-woven aramid fabric style 724 (Kevlar ® 129 fibre, 1000 denier, 24×24 yarns per inch) and the tensile properties of in idual aramid yarn extracted from the fabric are presented. It was found that this fabric is balanced with less than 5% difference in strength between the warp and weft directions. The mechanical properties of the in idual yarns were found to be lower than those reported for Kevlar ® 129 fibre, which is explained by the fact that the yarns were damaged during the extraction process or weaving process. A 3D finite-element model of the tensile testing of plain-woven fabric was built at the mesoscale in Abaqus/Explicit by modelling in idual crimped yarns and taking into account friction. Material properties and yarn geometry for the model were obtained from experimental observations. An orthotropic elastic model with failure criterion based on the yield stress was used. Numerical results were analysed and compared with experimental results. It was found that the numerical model can reproduce the physical experimental observations, the yield strength and the failure strain.
Numerical study of the hydrodynamic drag force in atomic force microscopy measurements undertaken in fluids
Publisher: Elsevier BV
Date: 11-2014
DOI: 10.1016/J.MICRON.2014.05.004
Abstract: When atomic force microscopy (AFM) is employed for in vivo study of immersed biological s les, the fluid medium presents additional complexities, not least of which is the hydrodynamic drag force due to viscous friction of the cantilever with the liquid. This force should be considered when interpreting experimental results and any calculated material properties. In this paper, a numerical model is presented to study the influence of the drag force on experimental data obtained from AFM measurements using computational fluid dynamics (CFD) simulation. The model provides quantification of the drag force in AFM measurements of soft specimens in fluids. The numerical predictions were compared with experimental data obtained using AFM with a V-shaped cantilever fitted with a pyramidal tip. Tip velocities ranging from 1.05 to 105 μm/s were employed in water, polyethylene glycol and glycerol with the platform approaching from a distance of 6000 nm. The model was also compared with an existing analytical model. Good agreement was observed between numerical results, experiments and analytical predictions. Accurate predictions were obtained without the need for extrapolation of experimental data. In addition, the model can be employed over the range of tip geometries and velocities typically utilized in AFM measurements.
Mechanical characterization of fiber metal laminate based on aramid fiber reinforced polypropylene
Publisher: Elsevier BV
Date: 07-2017
The Effect of Microstructure and Welding-Induced Plasticity on the Strength of Ni–Mo–Cr Alloy Welds
Publisher: Elsevier BV
Date: 2020
DOI: 10.2139/SSRN.3721067
Microstructure and mechanical properties of hard Acrocomia mexicana fruit shell
Publisher: Springer Science and Business Media LLC
Date: 25-06-2018
DOI: 10.1038/S41598-018-27282-8
Abstract: Fruit and nut shells can exhibit high hardness and toughness. In the peninsula of Yucatan, Mexico, the fruit of the Cocoyol palm tree ( Acrocomia mexicana ) is well known to be very difficult to break. Its hardness has been documented since the 1500 s, and is even mentioned in the popular Maya legend The Dwarf of Uxmal. However, until now, no scientific studies quantifying the mechanical performance of the Cocoyol endocarp has been found in the literature to prove or disprove that this fruit shell is indeed “very hard”. Here we report the mechanical properties, microstructure and hardness of this material. The mechanical measurements showed compressive strength values of up to ~150 and ~250 MPa under quasi-static and high strain rate loading conditions, respectively, and microhardness of up to ~0.36 GPa. Our findings reveal a complex hierarchical structure showing that the Cocoyol shell is a functionally graded material with distinctive layers along the radial directions. These findings demonstrate that structure-property relationships make this material hard and tough. The mechanical results and the microstructure presented herein encourage designing new types of bioinspired superior synthetic materials.
Structural effects on compressive strength enhancement of concrete-like materials in a split Hopkinson pressure bar test
Publisher: Elsevier BV
Date: 11-2017
Mechanical behaviour of composite sandwich panels with foamed concrete core reinforced with natural fibre in four-point bending
Publisher: Elsevier BV
Date: 12-2021
Micromechanical analysis of the kink‐band performance at the interface of a thermoplastic composite under tensile deformation
Publisher: Wiley
Date: 16-02-2010
DOI: 10.1002/PC.20973
Finite-Element Modelling of Ballistic Impact of Plain-Woven Aramid Fabric
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.769
Abstract: In this work, a 3D finite-element model of the ballistic impact of a multi-layered plain-woven aramid fabric style 720 (Kevlar ® 129 fibre, 1420 denier, 20×20 yarns per inch) impacted by a 6.7-mm spherical projectile was built at the mesoscale in Abaqus/Explicit by modelling in idual crimped yarns. Material properties and yarn geometry for the model were obtained from reported experimental observations. An orthotropic elastic model with a failure criterion based on the tensile strength of the yarns was used. Numerical predictions were compared with available experimental data. It was found that the finite-element model can reproduce the physical experimental observations, such as the straining of primary yarns and pyramidal-shaped deformation after perforation. The permanent deformation of fabric targets predicted by the numerical simulations was compared with available experimental results. It was found that the model fairly predicted the permanent deformation with a difference of about 21% when compared with experiments.
Low velocity impact response of fibre metal laminates based on aramid fibre reinforced polypropylene
Publisher: Elsevier BV
Date: 07-2019
“A Terrible Beauty”: Iris Murdoch’s Irish Novel, The Red and the Green
Publisher: Informa UK Limited
Date: 17-11-2019
Nanomaterials as fertilizers for improving plant mineral nutrition and environmental outcomes
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EN00971J
Abstract: Nanomaterials can potentially be used as fertilizers to improve both plant nutrition and environmental outcomes.
Bioimaging Techniques Reveal Foliar Phosphate Uptake Pathways and Leaf Phosphorus Status
Publisher: Oxford University Press (OUP)
Date: 15-06-2020
DOI: 10.1104/PP.20.00484
Related Organisations
Lunds University & Royal Veterinary And Agricultural University
Location: Sweden
Australian Nuclear Science And Technology Organisation
Location: Australia
Related Funding Activities
Linkage Projects - Grant ID: LP130100741
Start Date: 10-2013
End Date: 06-2018
Amount: $241,604.00
Funder: Australian Research Council
View Funded Activity