爆炸载荷下双层泡沫铝动态响应和能量吸收

Dynamic Response and Energy Absorption of Double-layered Aluminum Foam under Blast Loading

对爆炸载荷下双层泡沫铝动态响应和能量吸收进行了试验和仿真研究。通过试验研究了正梯度和负梯度泡沫层组合条件下试样的压实变形特性。采用随机Voronoi技术对双层泡沫压实过程进行了数值模拟。研究结果表明:对正梯度泡沫试样依次压实,压实过程中吸收的能量和传递到背板的冲量最多;负梯度泡沫试样的两层泡沫前端均出现压实波,压实过程中吸收的能量和传递到背板的冲量最小;泡沫试样能量吸收能力随着梯度程度和爆炸载荷的增加而增加。本研究为层状泡沫在爆炸防护方面的应用提供参考。

Dynamic response and energy absorption of double-layered aluminum foams with a front-plate are investigated experimentally and numerically. Blasting experiments are carried out to investigate the deformation of aluminum foams with positive and negative gradients. The compacting process of aluminum foams is numerically simulated performed using the periodic Voronoi structures. The results show that the greater the foam gradient is,the higher the energy dissipates; however,the layered foam with higher energy absorption transmits more impulse to the protected structure. When a compacted wave appears in the front end of two layer foams with a negative density gradient,the energy absorption and transmitted impulse are the lowest. The energy absorption capacity of layered foam increases with blast pressure due to higher dynamic plateau stress and crushed displacement at higher blast pressure.