Mesoscale Simulation of Cavity Collapse Hot Spot Mechanism in HMX under Shock Loading
-
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。Abstract: 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.
-
Key words:
- discrete element method /
- hot spot /
- cavity collapse /
- mesoscale simulation
-
Campell A W, Davis W G, Travis J R. Shock Initiation of Detonation in Liquid Explosives [J]. Physics of Fluids, 1961, 4(4): 498. Zhang G R, Chen D N. The Initiation Dynamics in Condensed Explosives [M]. Beijing: National Defense Industry Press, 1991. (in Chinese) 章冠人, 陈大年. 凝聚炸药起爆动力学 [M]. 北京: 国防工业出版社, 1991. Sun J S, Zhu J S. Theory Detonation Physics [M]. Beijing: National Defense Industry Press, 1995. (in Chinese) 孙锦山, 朱建士. 理论爆轰物理 [M]. 北京: 国防工业出版社, 1995. Sun C W, Wei Y Z, Zhou Z K. Application Detonation Physics [M]. Beijing: Science Press, 2000. (in Chinese) 孙承伟, 卫玉章, 周之奎. 应用爆轰物理 [M]. 北京: 科学出版社, 2000. Dienes J K, Middleditch J, Kershner J D, et al. Progress in Statistical Crack Mechanics: An Approach to Initiation [A]//Proceedings of the 12th Symposium (International) on Detonation [C]. San Diego, 2002. DienesJ K, Kershner J D. Multiple-Shock Initiation via Statistical Crack Mechanics [A]//Proceedings of the 11th Symposium (International) on Detonation [C]. Colorado, 1998: 717-724. Dey T N, Kamm J R. Numerical Modeling of Shear Band Formation in PBX-9501 [A]//Proceedings of the 11th Symposium (International) on Detonation [C]. Colorado, 1998: 725-734 . Chitanvis S M. Hotspot Mechanisms in Shock-Melted Explosives [J]. AIP Conf Proc, 2004, 706: 319-322. Tang Z P, Horie Y, Psakhie S G. Discrete Meso-Element Dynamic Simulation of Shock Response of Reactive Porous Solids [J]. AIP Conf Proc, 1996, 370: 657-660. Tang Z P, Horie Y, Psakhie S G. Discrete Meso-Element Modeling of Shock Processes in Powders [A]//High-Pressure Shock Compression of Solids Ⅳ [C]. New York: Springer-Verlag, 1997: 143-176. Tang Z P, Horie Y, Psakhie S G. Discrete Meso-Element Modeling of Shock Processes in Powders, Vol. 1-Theory and Model Calculations [R]. Hefei: NCSU, 1995: Wang W Q. The Discrete Element Method and Its Application in Material and Structure Mechanics [D]. Hefei: USTC, 2000. (in Chinese) 王文强. 离散元方法及其在材料和结构力学响应分析中的应用 [D]. 合肥: 中国科学技术大学, 2000.
点击查看大图
计量
- 文章访问数: 8213
- HTML全文浏览量: 557
- PDF下载量: 484