文章编号：1004－5422(2022)01－0058－07

DOI:10.3969/j.issn.1004-5422.2022.01.010

基材塑性模量对手性拉胀结构拉胀性能的影响

安文龙，吴　璇，江松辉，朱一林

（西南石油大学 土木工程与测绘学院，四川 成都 610500）

摘　要：针对两种经典手性拉胀结构（三节点反手性材料和六节点手性结构），系统考察了基体材料塑性模量对其拉胀性能（负泊松比行为）的影响.结果表明：塑性变形会抑制三节点反手性结构的拉胀性能，基体材料塑性模量越小，其拉胀性能越差；与之相反，塑性变形会促进六节点手性结构的拉胀性能，基体材料塑性模量越小，其拉胀性能越好.此外，在初始变形时，两种结构的负泊松比响应均为各向同性，但随着变形的增加，负泊松比响应转为具有旋转对称性的各向异性.

关键词：拉胀超材料；负泊松比；塑性模量；手性结构

中图分类号：TB34   文献标志码：A

Effects of Plastic Modulus of Base Material on Auxeticity of Chiral Auxetics

AN Wenlong,WU Xuan,JIANG Songhui,ZHU Yilin

(School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China)

Abstract：In this paper,the effects of plastic modulus of the base material on the auxeticity of two classical chiral auxetics (i.e.,antitrichiral and hexachiral auxetics) are investigated systematically.It is shown that the auxetic behavior of antitrichiral structure is restrained by the plastic deformation of the base material and lower base material plastic modulus hence leads to worse auxetic performance.On the contrary,plastic deformation of the base material facilitates the auxeticity of hexachiral structure and lower plastic modulus hence leads to better auxetic performance.In addition,the negative Possion’s ratio response of the two auxetics presents isotropy at the initial stage,which becomes anisotropy with rotational symmetry with the increment of deformation.

Key words：auxetics;NPR;plastic modulus;chiral structures