不同起爆方式对聚焦战斗部性能影响的数值模拟

Numerical Simulation of Effect of Different Initiation Positions on a Certain Focusing Fragment Warhead

利用LS/DYNA软件,采用中心和偏心两种起爆方式引爆聚焦战斗部进行全模型三维数值模拟,得到该战斗部两种状态下的破片初速及其分布规律;在仿真模型中加入靶板,得到距战斗部中心6 m处的破片分布,结果显示破片在两种起爆方式下都能在靶板上形成聚焦带。通过统计得出,偏心起爆能使破片速度增益为20.3%,破片在6 m处带宽为1 m的密度增益为9.6%,飞散角和方向角基本一致。

To increase fragment warhead performance,aimable fragment warheads were widely designed and developed to obtain high lethality against air target. A certain focusing fragment warhead driven by two different places of detonation respectively, were numer- ically simulated by using DYNA3D. To obtain the fragment distribution density ,target was modeled numerically at 6 m far away from the fragment warhead. The simulation results show that the fragments can focus on the target, and the fragment ejection angle and azimuth angle agree with each other. The velocity of directional fragment under two asymmetric points initiation is 20.3% faster than that under the center initiation ,and the fragment distribution density under two asymmetric points initiation is 9.6% greater than that under the center initiation. Simulation results could be used for the initiation system of focusing fragment warhead in engineering practice