Composites with auxetic inclusions showing both an auxetic behavior and enhancement of their mechanical properties

详细信息	查看全文 | 推荐本文 |

• 作者：Mohamed Assidi^a ; ^{mohamed.assidi@gmail.com} ; Jean-Franç ; ois Ganghoffer^b
• 关键词：Auxetic composite ; Architectured inclusions ; Numerical homogenization ; Asymptotic homogenization
• 刊名：Composite Structures
• 出版年：2012
• 期刊代码：15_02638223
• 类别：ms
• 出版时间：July, 2012
• 卷：94
• 期：8
• 页码：2373-2382
• 文件大小：822 K

摘要

Composite materials made of auxetic inclusions and giving rise overall to negative Poisson鈥檚 ratio are considered, adopting a two-steps micromechanical approach for the calculation of their effective mechanical properties. The inclusions consist of periodic beam lattices, whose equivalent mechanical properties are calculated by a discrete homogenization scheme in a first step. The hexachiral and hexagonal reentrant lattices are considered as representative of the two main deformation mechanisms responsible for auxeticity. In a second step, the equivalent properties of the composite are calculated from numerical homogenization using the finite element method. It is shown that both an auxetic behavior and enhanced moduli can be obtained for not too slender micro-beams.