水下爆炸冲击波作用下屏蔽装药的冲击引爆理论和仿真研究

针对水下爆炸冲击波对屏蔽装药的冲击引爆问题展开研究。从理论上建立了水下爆炸冲击波对屏蔽装药的冲击压力计算方法,结合炸药起爆判据,可确定炸药冲击引爆的临界条件;采用AUTODYN仿真软件,对水下爆炸冲击波冲击引爆屏蔽装药的过程进行了数值模拟;分析了主发药量和屏蔽板厚度对炸药临界起爆的影响;采用最小二乘法得到了临界理论起爆判据的参数n、K,与文献中的起爆判据进行对比,在一定范围内符合较好。结果表明:理论计算与数值模拟误差不超过6.75%,说明所建立的理论计算方法是有效的;相同条件下,随着主发药量的增加和屏蔽挡板厚度的减小,水下爆炸冲击波对屏蔽装药的临界起爆距离随之降低。

Initiation theory of shield explosive impacted by underwater explosion shock wave and its simulation

The initiation problem of shielded explosive impacted by underwater explosion shock wave was studied? The method of calculating the impact pressure of underwater explosion shock wave on shielded charge was established theoretically. Combining the explosive initiation criterion, the critical condition for explosive impact initiation was determined. The simulation software AUTODYN was used to numerically simulate the process of underwater explosion shock wave impacting and initiating shielded charge. The effects of main dose and shield baffle thickness on explosive critical initiation were analyzed. The least square method was used to obtain parameters n and K of the theoretical critical initiation criterion, and they were compared with those of the initiation criterion published in literature. The results showed that the theoretical results agree well with those published in literature within a certain range;the error between theoretical calculation results and numerical simulation ones is not more than 6. 75%, so the established theoretical calculation method is effective;under the same conditions, with increase in main dose and decrease in shield baffle thickness, the critical initiation distance of shield explosive impacted by underwater explosion shock wave drops.