冲击压缩下玻璃样品后自由表面速度的过冲现象  

Velocity Overshoot of Rear Free-surfaces of Glass under Impact

作　　者：赵剑衡[1] 孙承纬[1] 赵峰[1] 文尚刚[1] 刘仓理[1] 段祝平[2] 

机构地区：[1]中物院流体物理研究所,四川绵阳621900 [2]中国科学院力学研究所,北京100080

出　　处：《爆炸与冲击》2002年第1期72-78,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目 (19772 0 48;中国工程物理研究院基金项目 (980 10 3)

摘　　要：实验发现当飞片碰撞玻璃样品产生的冲击载荷超过一定值后 ,玻璃样品后自由表面速度时程曲线上有“过冲现象” ,即速度上升到最大值后 ,立即开始下降 ,其时间的开始部分类似于三角波。通过高速摄影和VISAR等测试手段对这一现象进行了较系统的研究 ,发现其与玻璃样品后自由表面附近的破碎有关 ,建立了描述这一破坏现象的损伤演化方程 ,并进行了数值模拟。计算结果和实验结果吻合 ,表明对这个现象的解释是合理的。When glass samples were impacted by flyers,the velocity of its rear free surface firstly increased to its maximum,and then began to decrease.The phenomenon was investigated in details using VISAR and high speed photography in this work.The experimental results revealed that the overshoot was suggested to be connected with fragmentation(destruction wave)on rear free surface of glass sampls during shock wave reflection.A theoretical model was suggested to explain this phenomenon,and a related numerical simulation was carried out too.The results from the simulation with the suggested model is in good agreement with the experimental results.This demonstrates that the modle about the overshoot is reasonable.

关 键 词：过冲现象 冲击波 破坏波 冲击压缩 玻璃样品 后自由表面速度 高速摄影 数值模拟 

分 类 号：O347.3[理学—固体力学]