Dynamic responses and energy absorption properties of honeycombs with negative Poisson's ratio

被引：0
作者：
Han H. [1 ]
Zhang X. [1 ]
Wang P. [1 ]
机构：
[1] Department of Mechanical Engineering, North China Electric Power University, Baoding, 071003, Hebei
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2019年 / 39卷 / 01期
关键词：
Cellular materials; Energy absorption; Negative Poison's ratio (NPR); Plateau stress enhancement effect;
D O I：
10.11883/bzycj-2017-0281
中图分类号：
学科分类号：
摘要：
In this work, for the traditional square honeycombs, we obtained a joint-based hierarchical honeycomb model with the negative Poisson's ratio (NPR) by replacing the structural nodes of the original honeycombs having smaller inner concave structures. We numerically investigated the dynamic responses and energy absorption characteristics of these honeycombs with NPR under in-plane crushing using the explicit dynamic finite element analysis (DFEA), revealing that, apart from the impact velocity and the relative density, the in-plane dynamic properties of the honeycombs also depend upon the cell micro-structure. Compared with those of the square honeycombs, the dynamic strengths and energy absorption abilities of these honeycombs are obviously improved. Under low or moderate velocity crushing, the specimens exhibit the obvious "neck shrinkage" phenomenon of auxetic materials, and show the unique plateau stress enhancement effect. Based on the energy absorption efficiency method and the one-dimensional shockwave theory, the empirical formulae of densification strain and dynamic plateau stress were given to predict the dynamic load-bearing capacity of the honeycombs with NPR. Our study can serve as a guidance for the multi-objective optimal dynamic design of auxetic cellular materials. © 2019, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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