轴向增强战斗部端部惰性填充物对端部破片飞散特性的影响

在当前破片战斗部动态毁伤场设计中，中心盲区效应被视为影响战斗部毁伤效率提高的关键因素。轴向增强战斗部作为消除战斗部动态中心盲区的重要手段，越来越受到相关研究人员的重视。本文中基于光滑粒子流体力学计算方法，建立了一系列轴向增强战斗部（端部分别含有惰性聚氨酯填充物、尼龙填充物和爆炸填充物）在爆炸载荷作用下的破碎和碎片散布过程的数值模型，并用于研究战斗部前端填充物特性对壳体动态响应的影响。数值模拟结果表明，填充物对战斗部前部破片的速度影响显著，但对破片飞散角度影响较弱。通过比较特定碎片的速度历史曲线，分析了惰性填料对碎片速度的影响机理。研究结果表明，聚氨酯泡沫填充物可以显著延缓爆炸冲击波对前破片的加速过程，并在一定程度上降低爆炸载荷，尼龙填充物可以在一定程度上降低前向破片和侧向破片的加速度，从而表明爆炸载荷被引导均匀分布在末端位置周围。结合战斗部自身的牵连速度，使用低密度和低质量填料代替头部装药具有相同的动态毁伤效果，可以提高轴向增强战斗部的能量利用效率。

Influence of end non-reactive fillers on the dispersion of the fragments in an axially-enhanced warhead

In the current design of the dynamic damage field of the fragment warheads, the central blind area effect is regarded as an essential factor affecting the warhead damage efficiency improvement. The axially-enhanced warhead has become an important design means to eliminate the dynamic central blind area of the warhead, which attracts more and more attention from relevant researchers. In the present paper, based on the smoothed particle hydrodynamics (SPH) computation method, a series of numerical models for the shell breaking and fragment dispersion processes of axially-reinforced warheads with non-filler, polyurethane filler nylon filler and explosive filler, respectively, at the end under the explosive loadings are established, and used to study the influence of the characteristics of the fillers in the front of the warhead on the dynamic response of the shell. It is found from the numerical simulations that the filler has a significant influence on the velocity of the fragments in the front of the warhead but a minor influence on the dispersion angle of the fragments. The mechanism of the influence of the non-reactive filler on the fragment velocity is analyzed by comparing the velocity history curves of the specific fragments. The results show that the polyurethane foam filling can significantly delay the acceleration process of the explosive shock wave to the forward fragment and reduce the explosive load to a certain extent. The nylon filler can reduce the acceleration of the forward fragment and the acceleration of the lateral fragment to a certain extent. Thus, the explosion loading is guided to be evenly distributed around the circumference of the end position. Considering the synthesis of the involved velocity of the warhead, using low-density and low-mass filler instead of head charge has the same dynamic damage effect of improving the energy utilization efficiency of the axially-enhanced warhead. The numerical models established in this paper and the research finding can provide some reference for the dynamic damage field design of conventional fragment warheads.