冲击波叠加效应对组合式多爆炸成型弹丸成形的影响研究

为探明组合式多爆炸成形弹丸（MEFP）弹丸的成形机理、研究形成良好弹丸的关键因素，运用LS-DYNA显式动力学软件对同时起爆和时差起爆条件下组合式MEFP成形过程进行了数值模拟计算，并对多个子装药爆轰场冲击波叠加效应进行了理论分析。研究表明：导致中心弹丸易于断裂、速度较快，周边弹丸形状不对称的主要原因是侧壁和罩顶反射冲击波的叠加作用；选用低密度吸能效果较好的填充介质可以减小反射波的强度从而减弱其叠加效应；当起爆时差超过5µs，中心子装药的药型罩会出现过度压垮的现象，不利于弹丸的成形。研究成果为战斗部填充介质的选取、合理装药间距的确定、多点起爆器材精度的确定等关键技术提供了理论依据

Superposition effect of shock waves on formation of a grouped multiple explosive formed projectile

To investigate the forming mechanism of a multiple explosive formed projectile(MEFP)and find the key factors forming a good projectile,LS-DYNA was used to simulate the forming process of a grouped MEFP under conditions of simultaneous and asynchronous detonation.Also the superposition effect of shock waves was theoretically analyzed.The study indicated that the superposition of the shock waves reflected by the parietal and the side wall of the charge is the main reason of the center projectile tending to break with a bigger velocity and the projectile perimeter having an asymmetrical shape;choosing a low density filled material with a good energy absorption ability can minimize the intensity of the reflected waves and the superposition effect;when the detonating delay is more than 5μs,the liner of the center charge will be over-collapsed,it is harmful to the formation of the projectile.The conclusions provided a theoretic basis for choosing a proper filled material,determining the space between the charges and adjusting precision of a multi-point detonating equipment.