含能破片冲击引爆屏蔽炸药研究

Initiation of Shielded High Explosive Impacted by Energetic Fragment

基于一维冲击波理论和Walker与Wasley的冲击起爆能量判据,对含能破片冲击屏蔽炸药过程进行了理论与数值分析。分别考虑了破片类型、破片尺寸和屏蔽壳厚度对冲击起爆的影响。结果显示,钢壳破片起爆能力优于铝壳破片,临界起爆速度随着含能材料直径的增长和屏蔽壳厚度的减小而降低;理论模型与数值计算结果吻合较好。由实验研究发现,与普通惰性破片的毁伤作用机理不同,含能破片主要是利用冲击波能量引发含能物质反应,反应释放的化学能与冲击波能量叠加对目标进行毁伤;能量输出方式主要为化学反应能。

Based on the one-dimensional shock wave theory and the Wasley＇s shock initiation energy criterion,the process of energetic fragment impacted shielded high explosives is theoretically and numerically analyzed.Fragment styles,fragment sizes and shielded plate thicknesses are considered respectively.The results show that the critical initiation velocity of the steel shell fragments is larger than that of the aluminum shell fragments,and with the increase of the diameter of energetic materials and the decrease of the shielding,the critical velocity decreases.The theoretically calculated results agree well with those of the corresponding numerical simulation.The different damage mechanism of energetic fragments and inert fragments is found.The damage mechanism of inert fragments is a kinetic energy of impact,but that of the energetic fragment is an explosive chemical reaction energy.The explosive chemical reaction energy is caused by impacted shock waves.