奥克托今基战斗部装药与壳体匹配关系的数值模拟

自然破片战斗部装药与壳体之间的匹配关系对破片的形成起着至关重要的作用，破片的数量直接影响战斗部的毁伤威力。本文以某HMX基浇注PBX炸药作为杀爆战斗部主装药，为研究主装药与壳体材料及厚度之间的匹配关系，建立简化缩比战斗部有限元模型，选取30CrMnSi、4340钢、45钢三种材质作为壳体材料，并设置每种壳体的厚度分别为5 mm、5.5 mm、6 mm、6.5 mm、7 mm，采用AUTODYN软件中的Stochastic随机破坏模型对自然破片战斗部的爆炸过程进行模拟。结果表明，当主装药浇注PBX炸药爆炸时，壳体厚度为6.5 mm的4340钢作产生的有效破片数量最多，为325 个，并且有效破片占破片总数的比例较优，达到43.10%；其动能大于98 J的破片数量最多，为276 个。研究结果可以为杀爆战斗部的设计提供一定理论支撑。

Numerical Simulation of Matching Relationship between HMX Base Warhead Charge and Shell

The matching relationship between the charge and the shell of the natural fragment warhead plays a crucial role in the formation of fragments, and the number of fragments directly affects the damage power of the warhead.In order to study the matching relationship between the main charge and the shell material and thickness,a simplified scaled warhead finite element model was established with a certain HMX-based cast PBX composition as the main charge of the anti-explosive warhead. Three materials of 30CrMnSi,4340 steel, and 45 steel are set as the shell materials of the model, and the thickness of each shell is set to 5 mm,5.5 mm, 6 mm, 6.5 mm, and 7 mm, respectively.And the Stochastic failure model in AUTODYN is used to simulate the explosion process of the natural fragment warhead. The results show that when the explosion simulation with main charge of PBX composition is completed, the simulation with 6.5 mm thick 4340 steel as the shell produces the most effective fragments (325), the proportion of the effective fragments to the total fragments is better (43.10%), and the quantity of fragments which kinetic energy is greater than 98 J is the most(276).The research results can provide some theoretical support for the design of an explosive killing warhead.