高速冲击条件下玻璃材料的破坏分析

Analysis of Failure Behaviors in Glass under Shock Loading

分析了玻璃材料在高速冲击条件下的破坏波现象 ,对破坏波的传播机制及其动态特征以及破坏层的性质进行了研究。在实验分析的基础上提出了一种由偏应力冲量决定的损伤累积模型 ,并采用Heaviside函数来描述材料内部的破坏迟滞现象 ;数值模拟了破坏波的传播过程、破坏层的横向应力和纵向压缩应变的演化特征 。

The failure wave phenomena in glass media under shock loading are analyzed. The propagating mechanism and dynamic characteristics of failure wave and the property of failure layer are revealed. On the basis of experimental analysis, a damage accumulating model determinated by partial stress impulse is proposed, which describes the phenomenon of failure delay in materials being done with the Heaviside function. The propagating procedure, the evolution characters of transverse stress and longitudinal compression strain in failure layer are simulated. Furthermore a phenomenon is revealed that the failure wave velocity decreases after reflection of rarefaction wave at the boundary of failure layer.