Design of planar isotropic negative Poisson's ratio structures

被引：170

作者：

Shan, Sicong ^{[1
]}

Kang, Sung H. ^{[1
,2
,3
]}

Zhao, Zhenhao ^{[1
,4
]}

Fang, Lichen ^{[1
,4
]}

Bertoldi, Katia ^{[1
,5
]}

机构：

[1] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[2] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[3] Johns Hopkins Univ, Hopkins Extreme Mat Inst, Baltimore, MD 21218 USA

[4] Tsinghua Univ, Sch Aerosp, Beijing 100084, Peoples R China

[5] Harvard Univ, Wyss Inst Biol Inspired Engn, Cambridge, MA 02138 USA

来源：

EXTREME MECHANICS LETTERS | 2015年 / 4卷

关键词：

Poisson's ratio; Auxetic; Isotropic;

D O I：

10.1016/j.eml.2015.05.002

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Most of the auxetic materials that have been characterized experimentally or studied analytically are anisotropic and this limits their possible applications, as they need to be carefully oriented during operation. Here, through a combined numerical and experimental approach, we demonstrate that 2D auxetic materials with isotropic response can be easily realized by perforating a sheet with elongated cuts arranged to form a periodic pattern with either six-fold or three-fold symmetry. Moreover, we also show that the auxetic behavior can be easily tuned by varying the length of the cuts and that it is retained even under large levels of applied deformation beyond the limit of small strains. This novel, simple and scalable design can serve as an important guideline for designing and fabricating isotropic auxetic materials that can have a significant impact on a wide range of applications. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：96 / 102

页数：7

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