泡沫铝夹芯板重复击穿塑性响应及失效破坏

Plastic Response and Failure of Aluminum Foam Sandwich Plates Under Repeated Impacts

文中基于泡沫铝夹芯板的重复冲击实验,研究了冲头形状对夹芯板塑性响应及失效破坏的影响,并分析了其变形累积和能量耗散特性.结果表明:冲头直径与夹芯板边长比α直接影响夹芯板的变形模式,进而影响夹芯板的失效破坏模式.当α为0.2时,夹芯板主要产生局部凹陷,芯层通过局部压缩耗散能量,正面板首先发生破坏;当α达到0.4时,夹芯板主要产生整体弯曲和拉伸,芯层通过整体压缩耗散能量,背面板首先发生破坏.α越大,碰撞力峰值越大,碰撞时间越短,夹芯板的抗击穿次数越大.冲击能量越大,夹芯板在重复冲击下的能量恢复系数越小.

Based on the repeated impact test of aluminum foam sandwich panel,the influence of punch shape on plastic response and failure of sandwich panel was studied,and its deformation accumulation and energy dissipation characteristics were analyzed.The results show that the ratio of punch diameter to side length of sandwich panelαdirectly affects the deformation mode of sandwich panel,and then affects the failure mode of sandwich panel.Whenαis 0.2,the sandwich panel mainly produces local depression,the core layer dissipates energy through local compression,and the front panel is destroyed first.Whenαreaches 0.4,the sandwich panel mainly bends and stretches as a whole,and the core layer dissipates energy through integral compression,and the back panel is destroyed first.The greaterαis,the greater the peak value of collision force is,the shorter the collision time is,and the greater the number of times the sandwich panel can resist penetration.The greater the impact energy,the smaller the energy recovery coefficient of sandwich panel under repeated impact.