A novel auxetic chiral lattice composite: Experimental and numerical study

被引:156
作者
Zhang, Xue Gang [1 ]
Ren, Xin [1 ]
Jiang, Wei [1 ]
Zhang, Xiang Yu [1 ]
Luo, Chen [1 ]
Zhang, Yi [1 ]
Xie, Yi Min [2 ]
机构
[1] Nanjing Tech Univ, Coll Civil Engn, Nanjing 211816, Jiangsu, Peoples R China
[2] RMIT Univ, Ctr Innovat Struct & Mat, Sch Engn, Melbourne, Vic 3001, Australia
基金
中国国家自然科学基金;
关键词
Auxetic lattices; Negative Poisson's ratio; Stiffness; Energy absorption; Chiral; Composites; NEGATIVE POISSONS RATIO; MECHANICAL-PROPERTIES; SANDWICH STRUCTURES; ELASTIC-CONSTANTS; IMPACT RESPONSE; DESIGN; HONEYCOMB; BEHAVIOR; DEFORMATION; COMPRESSION;
D O I
10.1016/j.compstruct.2021.115043
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Auxetic materials and structures have many potential applications due to their counter-intuitive deformation behavior and desirable mechanical properties. However, auxetic structures have some drawbacks, such as relatively low stiffness and stability. To improve their mechanical performance, one common method is to fill soft materials in auxetic frames, i.e., auxetic two-phase composites. In this paper, a novel method to further enhance the mechanical properties of auxetic composites has been proposed, which is implemented by designing joints of frames. Mechanical properties and deformation characteristics of these novel composites and their conventional counterparts are investigated experimentally and numerically. The results of finite element analysis and experiments exhibit a good agreement. The energy absorption capacity and auxeticity of the proposed composites could be enhanced by optimizing the design of joints. Subsequently, parametrical studies are conducted to quantify the effects of the geometrical parameters and the volume fraction of the frame.
引用
收藏
页数:11
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