蜂窝填充梯度吸能结构力学特性试验研究

Experimental study on mechanical properties of honeycomb-filled gradient energy absorption structure

为实现碰撞变形顺序有序可控,功能梯度思想在吸能结构设计逐渐得到应用。为减小某动车组吸能结构在冲击过程中变形顺序的不确定性,采用蜂窝结构尺寸、诱导结构和强化加强筋板的梯度化设计思想,提出一种蜂窝填充梯度吸能结构,通过准静态压缩试验、刚性墙撞击和吸能结构偏置对撞的台车冲击试验研究其耐撞性能。研究结果表明:冲击时蜂窝填充梯度结构从前至后产生稳定有序可控的变形,冲击力随压缩行程增加至508.07 mm时上升至最大值821.69 kN,呈现梯度上升的趋势,吸收冲击动能为244.1kJ,满足某动车组耐撞击性能需求。

In order to control the order of collision deformation,the idea of functional gradient was gradually applied in the design of energy absorbing structures.To improve the deformation under impact,a honeycomb filled gradient energy absorbing structure was proposed,which was designed by using the gradient of honeycomb structure size,induced structure and reinforced rib plate.At the same time,the quasi-static compression test of energy absorbing structure,the rigid wall impact test and offset collision test of energy absorbing structure were carried out to study the crashworthiness of powered car train-set.The results show that the honeycomb-filled gradient structure produces stable,orderly and controllable deformation from front to back during impact.The impact force increases to the maximum value of 821.69 kN when the compression stroke increases to 508.07 mm.It shows a gradient upward trend,absorbing 244.10 kJ of impact kinetic energy,which meets the impact resistance requirements of powered car train-set.