基于偏心起爆的战斗部形状对破片密度的增益研究

Enhancement of warhead shape on fragments density based on eccentric initiation

为寻求同时解决定向战斗部对破片速度和杀伤密度增益的方法,以普通圆柱形战斗部为对照组,建立正六棱柱战斗部的三维模型。利用LS-DYNA对二者破片在端面中心、沿母线方向的偏心四点、八点3种起爆方式下的驱动过程进行模拟,评价破片的分散程度。结果表明:棱柱形战斗部的破片在目标方向的密度显著提升,是等径等高圆柱形战斗部的1.76倍;结合修正的格尼公式对棱柱形战斗部破片初速的估算,以及对破片单元速度数据的统计,分析得出偏心四点、八点起爆对棱柱形战斗部破片平均速度的增益分别为10.4%、21.2%;六棱柱战斗部与圆柱形战斗部在同一起爆方式下速度增益的效果相近。

In order to seek the methods to enhance the velocity and density of fragment simultaneously,the 3D model of regular hex style warheads was created and cylinder type was set as control group. The driving processes of fragments generated by 2types of warheads in three different conditions,whose initiation position is one point at center end-face,4 off-centered points along one generatrix and 8 points along two generatrices,were simulated by LS-DYNA. The level of dispersion was evaluated.The results show that the the fragments density of hex style warhead can be improved remarkably,which is higher than the cylindrical warhead by 1.76 times. Then the fragment velocity at directional region was obtained by modified gurney formulas. Gain of velocity was confirmed after the fragment elements data of both types at directional area were collected. Its concluded that the 4points and 8 points initiation can increase enhancement to 10.4% and 21.2%,respectively,and the enhancement level of the fragment velocity of these 2 types is similar.