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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Kočí, Jan | Prague |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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Alderson, Andrew
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Topics
Publications (8/8 displayed)
- 2023Superhydrophobicity of Auxetic Metamaterials
- 2021Shear modulus of conventional and auxetic open-cell foamcitations
- 2021Effect of Compressive Strain Rate on Auxetic Foamcitations
- 2020Auxetic orthotropic materials: Numerical determination of a phenomenological spline-based stored density energy and its implementation for finite element analysiscitations
- 2020Auxetic orthotropic materials: Numerical determination of a phenomenological spline-based stored density energy and its implementation for finite element analysis.citations
- 2020The use of auxetic materials in tissue engineeringcitations
- 2013Piezomorphic materialscitations
- 2011In situ 3D X-ray microtomography study comparing auxetic and non-auxetic polymeric foams under tensioncitations
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article
In situ 3D X-ray microtomography study comparing auxetic and non-auxetic polymeric foams under tension
Abstract
X-ray microtomography has been used to study in situ the uniaxial tensile response of low-density polyurethane foam. Two variants have been examined, one before and one after treatment to generate auxetic behaviour. For both variants, microstructurally faithful finite element (FE) models have been constructed from the initial tomographs. For each variant a series of tomographs have been collected during progressive straining. Poisson's ratios of 0.30 (conventional, non-auxetic) and -0.22 (auxetic) have been measured for the two variants by digital image correlation (DIC) between successive images. By comparison, the FE models exhibited Poisson's ratio's of 0.5 and -0.3, respectively. Key micromechanical mechanisms responsible for the auxetic effect have been observed during straining, such as the straightening of bent ribs and rotation of nodes (joints), compared to changes in the angles between essentially straight struts for the non-auxetic variant. The microstructurally faithful FE models confirm the mechanisms observed in the experiments and enable characteristic rib and node behaviour to be followed in greater detail. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.