炸药落锤试验点火机理的数值分析

Numerical analysis on the ignition mechanism of explosive in drop-weight test

炸药在低速撞击条件下发生点火爆炸,给炸药爆炸装置带来了安全管理上的隐患。若确定可能发生炸药点火的条件,可以采取一些预防措施,避免事故的发生。一种低速撞击行为发生在炸药落锤感度试验中,撞击速度一般小于20 m/s。利用Lagrange数值程序LEX2D,对落锤试验装置中所造成的炸药点火爆炸进行了初步分析,得到了炸药样品中应力和速度的变化历史,计算了炸药内部由于摩擦做功生热所引起炸药颗粒的分解过程。在一定程度上,可以预报落锤试验中炸药发生点火爆炸的可能性。

The ignition and explosion of explosives on the condition of low-velocity impact bring out the concern on the for the possible safety opera ignition of tion towards the devices with explosive charges. If the conditions are known explosives, it is avoidable of the occurrence of accidents due to the precautions made in advance. One situation of low-velocity impact behavior takes place in the drop-weight test. The impact velocity is commonly less than 20 m/s. An initial analysis is made to the ignition and explosion of explosive during drop-weight test by the use of Lagrangian numerical software LEX2D. The histories of the stress and particle velocity are obtained by the calculation. On the basis of such information, the decomposition of the explosive particulate due to the friction is calculated. It is shown that the methodology of this analysis can be applicable to predict the possibility of the ignition and explosion of explosives in drop-weight test.