撞击条件下分步压装装药的点火机理

Ignition Mechanism of Step Press Loading Charge under Impact Loading

利用大型落锤加载装置对不同密度分布状态的药柱进行了撞击加载试验,在分析试验前、后药柱中应力和密度分布状态变化的基础上,讨论了分步压装装药的点火机制。结果表明:药柱的力学响应与其内部密度分布情况密切相关,均匀密度药柱所能承受的最大载荷明显高于非均匀密度药柱。在撞击加载过程中,药柱内部径向密度差引起的剪切流动是导致分步压装装药点火的重要原因。

Impact tests of explosive samples with different density distributions were carried out using drop hammer. Based on the analysis of stress and density distribution before and after impact tests, ignition mechanism of step press loading charge was discussed. The results show that the mechanical response of explosive samples are dependent with the inner density distribution, uniform density sample with uniform density distribution can endure bigger load stress than sample with non-uniform density distribution. Shear flow caused by the radial density difference is one of the important reasons causing step press loading charge ignition during the impact loading.