冲击作用下HMX晶体孔洞塌缩热点生成机制的细观数值模拟  

Mesoscale Simulation of Cavity Collapse Hot Spot Mechanism in HMX under Shock Loading

作　　者：傅华[1] 赵峰[1] 谭多望[1] 王文强[1] 尚海林[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理国防科技重点实验室,四川绵阳621900

出　　处：《高压物理学报》2011年第1期8-14,共7页Chinese Journal of High Pressure Physics

基　　金：中国工程物理研究院科学技术重大基金(2005Z0101);国家自然科学基金(10772167);国防科技重点实验室基金(9140C6709020907)

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。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.

关 键 词：离散元法 热点 孔洞塌缩 细观数值模拟 

分 类 号：O347.1[理学—固体力学]