研究动能块对屏蔽B炸药冲击起爆机制与临界起爆速度。采用AutoDyn-3D仿真软件,对钨合金动能块撞击不同盖板厚度屏蔽装药仿真计算,获得着角0°~80°动能块引爆屏蔽装药临界起爆速度,拟合获得速度与着角函数关系。结果表明,临界起爆速度在盖板不同厚度条件下随着角增大非线性变化。着角大于40°起爆阈值速度随角度增加而增大,但增速不同;着角小于40°盖板厚度大于10mm速度随着角增大而减小,盖板厚度10mm屏蔽装药临界起爆速度具有随机性。

The critical velocity for ignition and shock initiation mechanism of kinetic energy block to shielded explosive of Comp. B was described. The tungsten-alloy kinetic energy block impacting different covered explosive was simulated by using Ansys AutoDyn-3D simulation software, and critical velocity for ignition of kinetic energy block detonating covered explosive at the angle of 0 to 80 was obtained. Through fitting, the functional relationship between velocity and collision angle was also obtained. The results showed that critical velocity for ignition changed nonlinearly with the increase of impact angle under conditions of different cover thickness. When impact angle was more than 40°, critical velocity for ignition of covered explosive increased with the increase of impact angle, but the growth rate was different. When impact angle was 40° or less and cover thickness was greater than 10 mm, critical velocity for ignition decreased with the increase of impact angle, and when the cover thickness was 10 mm, the critical velocity for ignition had characteristics of randomness.