Deformation mechanisms in negative Poisson's ratio materials: structural aspects |
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Authors: | R Lakes |
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Affiliation: | (1) Departments of Biomedical Engineering, and Mechanical Engineering, and Center for Laser Science and Engineering, University of Iowa, 52242 Iowa City, IA, USA |
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Abstract: | Poisson's ratio in materials is governed by the following aspects of the microstructure: the presence of rotational degrees of freedom, non-affine deformation kinematics, or anisotropic structure. Several structural models are examined. The non-affine kinematics are seen to be essential for the production of negative Poisson's ratios for isotropic materials containing central force linkages of positive stiffness. Non-central forces combined with pre-load can also give rise to a negative Poisson's ratio in isotropic materials. A chiral microstructure with noncentral force interaction or non-affine deformation can also exhibit a negative Poisson's ratio. Toughness and damage resistance in these materials may be affected by the Poisson's ratio itself, as well as by generalized continuum aspects associated with the microstructure. |
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