中文摘要：

热点的形成、点火以及成长过程是理解非均匀炸药冲击起爆的关键。采用离散元法,对冲击作用下含孔洞的HMX晶体进行了细观数值模拟。计算结果表明：在较低冲击作用下,孔洞边缘发生了较大的剪切变形,粘塑性功形成热点;而在较高冲击作用下,孔洞塌缩产生射流,汇聚流动,冲击下游炸药形成热点,并获得了孔洞塌缩和热点生成演化的细观过程。

英文摘要：

The origin,ignition,growth of hot spot are the factors to understand shock initiation in heterogeneous explosive.The process of cavity collapse in HMX under shock loading was simulated using discrete element method.The results showed that the visco-plastic deformation formed hot spot mechanism and there was serious shear distortion around cavity under low impact.It was also found that the micro-jetting formed hot spot under high impact.The mesoscale process of hot spot formation and cavity collapse were gained.