多组分PBX炸药细观结构冲击点火数值模拟  

Numerical simulation for analyzing shock to ignition of PBXs with different compositions in meso-structural level

作　　者：王晨[1,2] 陈朗[1] 刘群[1] 皮铮迪 胡晓棉[2] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《爆炸与冲击》2014年第2期167-173,共7页Explosion and Shock Waves

摘　　要：建立了炸药颗粒自由堆积三维计算模型,考虑了炸药颗粒尺寸和位置的随机分布、粘结剂对炸药颗粒的包覆和不同组分炸药颗粒间的级配;采用非线性有限元方法,对炸药颗粒由自由堆积到密实装药的压药过程进行模拟,构建了PBX炸药细观结构模型;对多元PBX炸药(HMX+TATB+Estane)细观结构冲击点火过程进行了计算,考虑冲击作用下炸药内部热力耦合作用和自热反应,计算不同组分比例混合炸药的冲击点火性能,分析了炸药组分对冲击点火的影响。研究表明TATB含量增加,混合炸药冲击感度降低。By considering the particle size, location in random distribution and the composite content, a three-dimensional computation model was developed for explosive particles in free deposition. The pressing process of the explosive particles from free deposition to molded explosives was numerically simulated by using the non-linear finite element method. Based on the above, the meso-structural models of PBXs （HMX＋TATB＋ Estane） were established. Thereby, numerical simulations were conducted to analyze the shock-to-ignition processes of the PBXs with different compositions in the meso-structural level. In the above numerical simulations, the thermo-mechanical coupling effect and the self-sustained thermal reaction within the PBXs were taken into account. The influences of the composition contents on the shock-to-ignition performances of the PBXs were discussed. The simulated results show that the composite explosives containing HMX and TATB become less sensitive as the TATB content in them increases.

关 键 词：爆炸力学 细观结构模型 三维计算模型 PBX炸药 冲击点火 

分 类 号：O381[理学—流体力学]