杆式弹对厚壁壳体装药冲击起爆机制模拟分析

In order to study the initiation mechanisms of the explosive charge covered with a thick shell impacted by a high- velocity rod projectiles, the shock physical explicit Eulerian dynamic software SPEED was applied to numerically simulate the interactions beween the tungsten rod projectiles with different diameters and lengths and the Comp-B charge covered with a thick shell, the up-down method was used to obtain the critical impact velocity and the change of the detonation position, and the effects of the projectile diameter and length on the critical impact velocity were obtained. The initiation mechanisms of the Comp-B charge detonated by the projectile at the critical impact velocity were analyzed in depth, and the effects of the projectile impact velocity on the initiation mechanism and the detonation position were obtained. The research results show that the critical impact velocity decreases significantly as the projectile diameter increases, the critical impact velocity first decreases and then gradually changes as the projectile length increases. When the Comp-B charge is detonated by the projectile at the critical impact velocity, there are two initiation mechanisms, namely the macro-shear initiation mechanism after the projectile penetrates the shell and the low-velocity impact initiation mechanism without penetrating the shell. The mechanisms will transform as the projectile impact velocity continues to increase above the critical impact velocity. If the macro-shear initiation mechanism dominates when the Comp-B charge is detonated by the projectile at the critical impact velocity, it will transform into the high-velocity impact initiation mechanism; if the low-velocity impact initiation mechanism dominates at this time, it will first transform into the macro-shear initiation mechanism, and then transform into the high-velocity impact initiation mechanism. The detonation position is at a certain distance from the interface between the explosive and the shell, the distance decreases as the impact velocity of the projectile increases if the initiation mechanism remains the same.