Hybrid materials with negative Poisson's ratio inclusions

被引:32
|
作者
Shufrin, Igor [1 ,2 ]
Pasternak, Elena [1 ]
Dyskin, Arcady V. [2 ]
机构
[1] Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia
[2] Univ Western Australia, Sch Civil & Resource Engn, Crawley, WA 6009, Australia
基金
澳大利亚研究理事会;
关键词
Auxetic materials; Sphere-reinforced composites; Negative Poisson's ratio inclusions; Finite element modelling of cubic inclusions; Differential scheme for composite materials; EFFECTIVE ELASTIC PROPERTIES; AUXETIC BEHAVIOR; THERMAL-EXPANSION; COMPOSITES; STIFFNESS; MICROSTRUCTURE; MODULUS; SOLIDS; SIZE;
D O I
10.1016/j.ijengsci.2014.12.006
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We consider hybrid materials consisting of auxetic (material with negative Poisson's ratio) and non-auxetic phases. The auxetic phase is represented by either spherical or cubic inclusions. We analyse the effective characteristics (the Young's and shear moduli and the Poisson's ratio) computed using either the differential scheme for the effective moduli of composites or the direct finite element simulations. The results are verified through Hashin-Shtrikrnan bounds. We demonstrate that by creating hybrids from auxetic and non-auxetic phases one can obtain considerable increase in stiffness over the stiffnesses of the phases. The stiffening effect is controlled by the value of the Poisson's ratios of the phases, shape of the auxetic inclusions and their concentration. Depending upon the concentration, the hybrid can be made both auxetic and non-auxetic. Even when the inclusions are cubic the hybrid is still nearly isotropic; it becomes truly orthotropic only when the Poisson's ratio of the auxetic phase is very close to the thermodynamic limit of -1. These findings can be applied directly in designing a new class of hybrid materials with enhanced stiffness. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:100 / 120
页数:21
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