Innovative 3D chiral metamaterials under large deformation: Theoretical and experimental analysis

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:202

Article

Qi, Dexing¹  Zhang, Peng¹  Wu, Wenwang^1,2  Xin, Kehao³  Liao, Haitao¹  Li, Ying¹  Xiao, Dengbao¹  Xia, Re⁴ 

[1] Beijing Inst Technol, Inst Adv Struct Technol, Beijing Key Lab Lightweight Multifunct Composite, Beijing 100081, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Dept Engn Mech, Shanghai 200240, Peoples R China

[3] Beijing Inst Space Long March Vehicle, Beijing 100076, Peoples R China

[4] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan 430072, Peoples R China

关键词: Chiral metamaterials;    Auxetic and rotation effects;    Large deformation;    Homogenization theory;    Mechanical properties;   

DOI  :  10.1016/j.ijsolstr.2020.06.047

来源: Elsevier

【 摘 要 】

In this paper, making use of the coupled deformation features of reentrant and tetrachiral lattices, innovative 3D chiral metamaterials are designed, in which their mechanical properties and deformation mechanisms are explored in details. Firstly, three types of innovative 3D chiral metamaterials are designed based on geometry topology in the (x) over bar(y) over bar plane, namely: tetrachiral, anti-tetrachiral and hybrid-tetrachiral, respectively. Secondly, the coupled tension and rotation deformation mechanisms of innovative 3D chiral metamaterials are investigated based on large deformation theories of representative unit cell. The theoretical formulas for extension stress, Poisson's ratio and rotation angle of the square loop are derived, it is found that wide range of negative Poisson's ratio can be obtained with the proposed 3D chiral metamaterials. Afterwards, tensile experiments are performed, and good agreements between theoretical, finite element and experimental results are presented, verifying the reliability of the theoretical models. Finally, influences of the geometry parameters on the mechanical behaviors of the proposed 3D auxetic metamaterials are also studied. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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