Mechanical design and analysis of bio-inspired reentrant negative Poisson’s ratio metamaterials with rigid-flexible distinction  

作　　者：Xinchun Zhang Junyu Wang Qidong Sun Jingyang Li Sheng Zhou Junfeng Qi Ran Tao 

机构地区：[1]Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding,China [2]Institute of Advanced Structure Technology,Beijing Institute of Technology,Beijing,China [3]Beijing Spacecrafts Manufacturing Factory,Beijing,China

出　　处：《International Journal of Smart and Nano Materials》2024年第1期1-20,共20页国际智能和纳米材料杂志（英文）

基　　金：supported by the Natural Science Foundation of Hebei Province of China(Grant No.A2020502005);the Independent Research and Development Project of China Aerospace Science and Technology Corporation(Grant No.0337000000003);the National Natural Science Foundation of China(Grant No.12272045).

摘　　要：Aiming at achieving tunable reentrant structures with rigidity and uniformity,respectively,the C-shaped and S-shaped reentrant metamaterials were proposed by the bionic design of animal structures.Utilizing beam theory and energy methodology,the analytical expressions of the equivalent elastic modulus of the metamaterials were derived.Differences in deformation modes,mechanical properties,and energy absorption capacities were characterized by using experiments and the finite element analysis method.The effects of ligament angle and thickness on the mechanical characteristics of two novel metamaterials were investigated by using a parametric analysis.The results show that the stiffness,deformation mode,stress-strain curve,and energy absorption effects of three metamaterials are significantly different.This design philosophy can be extended from 2D to 3D and is applicable at multiple dimensions.

关 键 词：Re-entrant mechanical metamaterials negative poisson’s ratio enhanced stiffness rigid-flexible distinction energy absorption 

分 类 号：TB34[一般工业技术—材料科学与工程]