Journal
ACTA MATERIALIA
Volume 57, Issue 3, Pages 875-880Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.10.043
Keywords
Statistical; Mechanics; Heterogeneity; Anisotropy; Auxetic
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To date, microstructural modelling of auxetic materials has relied mainly on the assumption of both a regular and a homogeneous microstructure present throughout the bulk material. The disorder within a material is seen as something undesirable, with the expectation that disorder or heterogeneity will tend to reduce the range of properties available. In this work the presence of short-range variations in the elastic Moduli are considered together with the resulting effect on a material's Poisson's ratio. It is shown that such variations alone can Cause a Material with a mean positive Poisson's ratio to become negative (auxetic). In addition, anisotropic variations can enhance the magnitude of a negative Poisson's ratio. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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