三点起爆同步误差对尾翼EFP成型性能的影响

针对三点起爆同步误差对尾翼爆炸成型弹丸(EFP)成型的影响问题,利用LS-DYNA有限元软件,分析了三点起爆同步误差引起的爆轰波不对称碰撞以及药型罩在复合爆轰波作用下的压垮过程,研究了三点起爆同步误差对EFP的尾翼形成及飞行速度的影响。结果表明,三点起爆同步误差造成三叉形高压区和三叉形中心超高压区偏离药型罩中心,使EFP尾翼成型不规则;三点起爆成型装药形成较佳尾翼EFP应满足的最大起爆同步误差为100ns,且尽量使中间起爆点起爆同步误差约为最大同步误差的一半,有利于降低尾翼EFP的水平分速度,提高飞行稳定性。

Effects of Three-point Initiation Synchronization Error on Formation Performance of EFP with Fins

LS-DYNA software was employed to investigate the asymmetric collision of detonation wave, empennage formation and velocity of explosively formed projectile(EFP) which are caused by three-point initiation synchronization error. Meanwhile, the distortion characters of the liner formed by the composite detonation waves were analyzed. Results indicate that the deviation of trigeminal high-pressure and central ultrahigh-pressure area from liner center are attributed to the error of three-point initiation, which lead to the irregularly formation of EFP empennage. It is noted that a better empennage formation can be obtained when the synchronization error is less than 100 ns. In addition, it will decrease the velocity in the horizontal direction and increase the flight stability of EFP with fins when the middle initiation point synchronization error is about half of the max.