破片对聚能装药战斗部冲击引爆数值模拟分析

针对二次破片引爆车内弹药毁伤效能难评估问题,分析了基于热点学说的冲击引爆临界速度准则. 利用数值模拟方法,以反应度为引爆判断参数,进行了冲击引爆过程中炸药内部压力与状态分析,验证了热点引爆学说;得到了聚能装药撞击位置、破片尺寸、破片材料等参数对冲击引爆影响规律,直径相同时,柱形破片的临界起爆速度比球形破片低;聚能装药残余弹体或二次破片完全有可能引爆车体内弹药,从而导致严重的二次效应,钢质破片有效尺寸约14 cm、速度约1800 m/s,或者钨质破片有效尺寸约14 cm、速度约1500 m/s就能发生冲击引爆. 

Numerical Simulation on Shock Detonation of Fragment to Shaped Charge

For the difficult to assessment armored vehicle detonation resulted from behind armor debris, the shaped charge warhead was taken as research object, to analyze critical detonation velocity criterion based on hotspot theory. The explosive inner pressure and state during the shock detonation were analyzed by numerical simulation, taking reaction as detonating parameter, to verify the hotspot detonation theory. Influence rules of such factors as shaped charge impact place, fragment dimension and fragment material on shock detonation were obtained. Under the condition of same diameter, critical detonation velocity of cylindrical fragment is lower than of spherical fragment. Residual shaped charge or behind armor debris can completely detonate ammunitions inside armored vehicles, which results in serious secondary damage effect. There will be shock detonation of explosive hit by the steel fragment with effective dimension of 14 cm and velocity of 1 800 m/s or tungsten fragment with 14 cm and 1 500 m/s.