Dynamic crushing responses of bio-inspired re-entrant auxetic honeycombs under in-plane impact loading

By Xin-chun Zhang, C. An, Zhen-feng Shen, He-Xiang Wu, Wengen Yang, Jiang-pan Bai. 2020

186 citations recorded by the source corpus.

Abstract In order to improve the impact energy absorption abilities and maintain good crushing load uniformity of auxetic honeycombs, a re-entrant arc-shaped honeycomb (RAH) model is proposed according to the concept of bio-inspired structure design. The in-plane impact resistances and absorbed-energy characteristics of bio-inspired auxetic RAHs subjected to a constant velocity crushing are numerically studied by using ABAQUS/EXPLICIT. It is shown that due to the introduction of re-entrant arc-shaped structures, the dynamic response curves of bio-inspired RAHs have better crushing load uniformity than conventional re-entrant honeycombs. Except for the relative density and impact velocity, the dynamic crushing behaviors of bio-inspired RAHs also depend upon the cell micro-structure parameters (e.g., the curvature). Based on the one-dimensional (1D) shock theory and absorbed-energy efficiency method, an empirical equation is deduced to evaluate the dynamic plateau stress of bio-inspired RAHs. The finite element (FE) results coincide well with those calculated by the empirical formulas. Moreover, the specific energy absorption (SEA) and energy dissipation rules of bio-inspired RAHs are discussed, which are also dependent on the curvature. These researches will provide technical support for the innovative structure design and dynamic optimization design of auxetic cellular structures.

Subfields: Mechanical Engineering, Polymers and Plastics, Pulmonary and Respiratory Medicine

View Paper: https://www.semanticscholar.org/paper/dcdcfcf5d359166825188fb0a95543918291c717