复合型含能破片冲击波起爆特性研究

为了解释冲击波对复合型含能破片内装药的起爆机理,建立了含能破片反射波冲击起爆理论模型,对含能破片的起爆阈值速度进行理论计算。对含能破片的撞靶过程进行数值模拟,分析了不同头部厚度、装药长度和破片直径对含能材料入射波和反射波起爆的影响。分析结果表明:含能破片反射冲击波起爆阈值速度比入射波低;破片壳体头部厚度只影响2种起爆方式的阈值速度,不决定装药的起爆方式,装药长度和破片直径之比k决定含能材料的起爆方式;不同的含能材料具有不同的临界值,当k小于临界值时,含能破片的临界起爆速度由反射波强度决定。2种起爆方式的毁伤模式有一定的差异,同时起爆方式也对释能时间有一定影响。

Shock Initiation Characteristics of Compound Energetic Fragment

To comprehend the initiation mechanism of the energetic fragments in impact penetration process,the theory model of reflected-wave initiation was established,and the initiation threshold velocity of incident-wave and reflected-wave was theoretically calculated. The impact penetration process of energetic fragment was numerically simulated. The effects of different shell-head-thickness and different ratios of length to diameter on the initiation by reflected-wave and incident-wave were analyzed. The results show that the threshold velocity of initiation by reflected-wave is lower than that of initiation by incident-wave. The shell head thickness doesn’t decide the initiation way,which only has an impact on initiation threshold velocity of two initiation ways,and the initiation way is decided by the ratio of length to diameter ( k ) . The theoretical-calculation critical-value of k is decided by different energetic materials. While k is lower than critical value, the initiation threshold velocity is decided by reflected-wave. Two initiation ways show the different damage effects and release time.