破片撞击起爆柱面带壳装药的临界速度修正判据

为获得适用于柱面带壳装药的冲击起爆修正判据，以Picatinny工程判据为基础加入修正项进行修正。采用AUTODYN-3D软件对破片撞击柱面带钢壳的B炸药进行数值计算，获得了破片入射角、装药曲率半径对炸药临界起爆速度的影响规律；通过拟合得到修正项表达式，建立了考虑破片入射角、柱壳装药形状函数的炸药起爆临界速度修正判据。判据计算值与实验数据和数值计算值吻合较好，该判据能较好的预测柱形带壳装药的冲击起爆条件。

Critical detonation velocity calculation model of cylindrical covered charge impacted by fragment

In this work, to obtain the critical detonation velocity calculation model about the cylindrical covered charge impacted by fragments, we added the correction terms to the velocity calculation based on the Picatinny engineering criterion. We found out about the influence of the fragment impact angle and the charge curvature radius on the critical detonation velocity using the AUTODYN software through simulating the tungsten fragment impact cylindrical steel casing filled with B explosive. Based on the fitting expression, we established the critical velocity calculation model of the explosive initiation considering the impact angle and the charge shape function. The model calculation values are in good agreement with the experimental data and the simulation results, thereby suggesting that the model can provide a better prediction of the impact initiation of the cylindrical covered charge.