大质量弹体冲击下带壳装药起爆特性数值分析

Numerical analysis of the detonation characteristicsof cased charges under mass impact

为探讨新型抗导弹防护结构,采用非线性动力学软件LS-DYNA,建立典型形状大质量弹体对圆柱形带壳装药结构的冲击起爆数值分析模型,计算分析了不同质量、形状与倾斜角的钨合金块体低速撞击下带壳B装药冲击起爆特性,获得了临界冲击速度,冲击起爆过程及压力变化。结果表明:弹体质量越大,装药内部形成的透射压力波影响范围越广,持续时间越长;质量在0.1~30 kg范围内,弹体冲击起爆带壳装药的性能与弹体的初始动能有关,端盖厚度为20、40、60 mm的B装药发生冲击起爆的弹体临界动能分别为250、930、1 600 kJ;弹体的临界起爆速度随倾斜角φ变化的规律受弹体形状影响,φ≤15°时,圆柱形弹体临界起爆速度最低,φ>15°时,球形弹体临界起爆速度最低。

In order to explore the mechanism of the new anti-missile protection structure,nonlinear dynamics software LS-DYNA was used to establish a large typical projectile on the cylindrical shell charge structure of the impact detonation numerical analysis model.Tungsten alloy projectile of different masses,shapes and tilt angles under the low-velocity impacting the shell B charge were calculated to obtain the critical impact velocity,the process of the detonation and the pressure change.The results show that:the larger the mass of the projectile,the wider the surface of the transmitted pressure wave formed inside the charge,and the longer the duration;In the 0.1~30 kg mass range,the projectile impact detonation of shelled charge performance is related to the initial kinetic energy.The critical kinetic energy of B charge with 20 mm,40 mm and 60 mm end caps under impact initiation is about 250 kJ,930 kJ and 1600 kJ respectively;Projectile tilt impact charge detonation orientation with the change in tilt angleφ.Asφ≤15°,the lowest critical impact velocity is by cylindrical projectile;Asφ>15°,the lowest critical impact is by velocity spherical projectile.