蜂窝材料在面内压缩下的动力坍塌(英文)

基于我们近年来的实验研究和数值模拟,主要概述了蜂窝材料受面内压缩时的准静态和动态坍塌行为.在准静态加载条件下,对圆胞蜂窝材料的方形试件施行了面内的双向等量压缩实验,观察到非均匀变形模式的发生和演化.为了研究加载速率的影响,对此过程也进行了有限元模拟,揭示了当加载速度增加到某一临界速度时,试件的变形由总体坍塌模式向渐进坍塌模式(即冲击波模式)转化.最后,将根据几种模型所作数值模拟得到的临界冲击速度同波的陷阱理论作了比较.

Dynamic Collapse of Honeycombs under In-plane Compressions

Based on our experimental and numerical studies,the present paper mainly describes our findings in the quasi-static and dynamic collapse of honeycombs under in-plane compression.In quasi-static experiments,in-plane equi-biaxial compression was applied to a square block of circular honeycomb,while the onset and evolution of inhomogeneous deformation were observed.To explore the effects of the loading speed,a finite element simulation on the collapse process of a circular honeycomb block under biaxial dynamic compression is carried out.The simulation reveals the transition from a global collapse mode to a progressive collapse mode(i.e.a shock mode).The critical loading velocity,which marks this mode transition,is further studied numerically by various models and compared with the prediction from the wave trapping theory.