破片冲击起爆屏蔽装药的临界判据

Critical Criterion of Shock Initiation of Covered Explosive Impacted by Fragment

为研究破片对带盖板屏蔽装药的冲击起爆问题,通过理论计算得到等效破片的直径与速度,结合Held判据得到破片冲击起爆屏蔽装药临界判据。用已有的实验数据验证了判据的正确性,并利用AUTODYN软件进行仿真比较,得到不同材料破片的临界起爆速度。仿真结果表明:通过该临界判据计算出的屏蔽炸药临界起爆速度和数值模拟所得结果误差均小于2%,计算结果与实验数据计算结果基本一致。

In order to study the shock initiation of the fragment on the covered explosive,the equivalent diameter and velocity of the fragment were obtained through theoretical calculations,and the critical criterion for the shock initiation of explosive was obtained by combining the Held criterion.Existing experimental data were used to verify the correctness of the criterion,and the simulation comparison using AUTODYN software was performed to obtain the critical initiation velocity of fragments with different materials.The simulation results show that errors of the critical initiation velocity of the covered explosive obtained by numerical simulation and theory are less than 2%,and the calculated results are basically consistent with the experimental data.