期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 72, 期 15, 页码 1848-1854出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2012.07.020
关键词
Structural composites; Mechanical properties; Finite element analysis (FEA); Negative Poisson's ratio
资金
- Research Grants Council of Hong Kong Special Administrative Region Government [PolyU 5158/12E]
Materials with negative Poisson's ratio (NPR) effects have been studied for decades. However, the studies have mainly focused on 2D periodic structures which only have NPR effects in certain in-plane directions. In this paper, a novel concept is proposed to develop composite structures with isotropic NPR effects using NPR random inclusions. The study starts from a finite element analysis of deformation mechanisms of two 2D representative cells which are embedded with a re-entrant square and a re-entrant triangle. respectively. Based on the analysis results, the re-entrant triangles are selected as random inclusions into a matrix to form 2D composite structures. Four such composite structures are built with different numbers of inclusions through a parametric model, and their NPR effects and mechanical behaviors are analyzed using the finite element method. The results show that the isotropic NPR effects of composites can be obtained with high random re-entrant inclusions. Thus, the novel concept proposed is numerically proved by this study. (C) 2012 Elsevier Ltd. All rights reserved.
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