铝合金圆波纹夹芯板对半球形体的低速冲击响应特性及失效机制

Response on the Characteristics and Failure Mechanism of Aluminum Alloy Circular Corrugated Sandwich Panels Under Low Velocity Impact

为研究铝合金圆波纹夹芯板在低速冲击下的吸能特性、变形情况和失效机理,利用落锤进行低速冲击试验,揭示冲击位置和初始冲击能量对圆波纹夹芯板低速冲击响应特性的影响。冲击位置分别为波纹夹芯板的节点和基座,冲击能量范围为120~400 J。实验结果表明,夹芯板主要发生拉伸断裂失效,冲击能量和位置对夹芯板动态载荷响应存在显著的影响。夹芯板的最大冲击载荷随着冲击能量增加而增加,并且节点冲击的最大载荷高于基座冲击的最大载荷,两者的差距随冲击能量增加而减小。夹芯板节点位置冲击的载荷可以迅速达到峰值,而基座位置冲击的载荷需要经过一个过程才能达到峰值。

In order to study the energy absorption characteristics,deformation and failure mechanism of aluminum alloy circular corrugated sandwich panel under low velocity impact,low velocity impact tests were carried out by using drop weight to reveal the influence of impact position and initial impact energy on the low velocity impact response characteristics of circular corrugated sandwich panel.The impact positions are the node and pedestal of corrugated sandwich panel,and the impact energy is in the range 120—400 J.The experimental results show that the dominant failure mode of the sandwich panel is tensile fracture failure,and the impact energy and position have significant effects on the dynamic load response of the sandwich panel.The maximum impact load of the sandwich panel increases with the increase of impact energy,and the maximum impact load of node is higher than that of pedestal,the difference between them decreases with the increase of impact energy.The impact load at the node of sandwich panel can reach the peak quickly,while the impact load at the pedestal needs a process to reach the peak.