The influence of cell micro-structure on the in-plane dynamic crushing of honeycombs with negative Poisson's ratio

被引:142
|
作者
Zhang, Xin-Chun [1 ]
An, Li-Qiang [1 ]
Ding, Hai-Min [1 ]
Zhu, Xiao-Yan [1 ]
El-Rich, Marwan [2 ]
机构
[1] North China Elect Power Univ, Dept Mech Engn, Baoding 071003, Peoples R China
[2] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB, Canada
基金
中国国家自然科学基金;
关键词
Reentrant honeycombs; micro-structure; plateau stress; in-plane dynamic crushing; negative Poisson's ratio; AUXETIC MATERIALS; FINITE-ELEMENT; PART II; STRENGTH; BEHAVIOR; FOAMS;
D O I
10.1177/1099636214554180
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The in-plane dynamic crushing behaviors and energy-absorbed characteristics of honeycombs with negative Poisson's ratio (NPR) have been studied by means of explicit dynamic finite element analysis (DFEA) using ANSYS/LS-DYNA. First, the honeycomb models filled with different reentrant cells by the variation of micro-cell configuration parameters (cell-wall angle and shape ratio) are established. The respective influences of micro-structure and impact velocities on the deformation behaviors, the dynamic plateau stresses and the absorbed energy of reentrant honeycombs are explored in detail. It is shown that owing to the variation of cell micro-structure, reentrant honeycombs display different macro-/micro- deformation properties during the crushing. For the given impact velocity, the dynamic plateau stresses are related to the shape ratio by a power law and to the cell-wall angle by least-square curves. And they are also proportional to the square of impact velocities for a high impact velocity. Based on the finite element simulated results and one-dimensional shock wave theory, an empirical formula for auxetic honeycomb to predict the dynamic plateau stress is derived in terms of relative density and impact velocity.
引用
收藏
页码:26 / 55
页数:30
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