摘要展开式定向杀伤战斗部是一种依靠战斗部展开来增加破片定向密度增益的战斗部，其展开过程需要借助辅装药的爆轰能量，当战斗部展开到最佳角度后主装药才被引爆。为了防止主装药在展开过程中发生殉爆，需研究各设计参量对主装药殉爆的影响规律。本文主要从隔爆层的厚度、隔爆层的材料类型、主装药的类型这三个方面来研究其对冲击波衰减的影响规律。通过LS-DYNA软件建立了展开式定向战斗部的简化模型，对辅装药的爆轰驱动过程进行了数值仿真，并对传入到主装药内的压力进行了理论计算。将数值仿真与理论计算的结果分析对比，结合炸药的冲击起爆临界压力判据，得到了影响主装药殉爆的主要因素，找出最合适的主装药类型和隔爆层的参数，为战斗部总体设计提供依据。61551

研究结果显示，隔爆层厚度的增加，会使传入到主装药内的压力减小，厚度越大，对冲击波压力的衰减的斜率越小。隔爆层的材料不同，对冲击波压力的衰减也不同。在一定厚度范围内，聚氨酯泡沫的隔爆性能最好，环氧树脂次之，钢板和铝板最差，所以隔爆层材料应该选择聚氨酯泡沫。主装药的选择不仅要考虑主装药分界面上初始参数的影响，还要考虑主装药的临界起爆压力。其中8701炸药时对冲击波的衰减最明显，COMP-B次之，PBX9404最不明显。但是因为8701的临界起爆压力比PBX9404小，所以主装药选择PBX9404炸药。

毕业论文关键词  爆炸力学 展开式定向战斗部  殉爆  数值仿真  LS-DYNA   Matlab

毕业设计说明书（论文）外文摘要

Title  Study of the Sympathetic Detonation for the Main Charge of the Evolvable Aimed Warhead

Abstract  The Evolvable Aimed Warhead is a warhead which increases the gain in fragment mass rely on the warhead’s expansion.Its Main Charge was detonated when the warhead expanded into ideal angle of space.In order to prevent the Sympathetic Detonation of the Main Charge when the Auxiliary Charge detonated.This paper mainly studied the law of which affected the shock wave attenuation from three aspects,which meaned proof layer thickness,the type of the material of proof layer and the donor explosive charge.Firstly, a simplified model for the Evolvable Aimed Warhead through the software LS-DYNA was established for the numerical simulation.Secondly,Matlab was used for theoretical calculations.Then numerical simulations were compared with theoretical analysis.Combined with the critical pressure criterion of explosive’s impact detonating,the main factors affecting the sympathetic detonation for the Main Charge were obtained. Afterwards,the most appropriate type of the Main Charge and the parameters of proof layer were found, in order to provide evidence to design the evolvable aimed warhead.

   The results showed that the pressure of the Main Charge was decreased along with the thickness of proof layer increases.But the attenuation potency dimension of the shock wave pressure was less obvious.Besides,It’s different from the attenuation of the shock wave pressure when the type of the material of proof layer was different.In a reasonable range of the thickness,the Polyurethane Foam’s proof performance was best,follow by the Epoxy,the steel and aluminum was worst.So the proof layer material should be selected the Polyurethane Foam.In addition ,the effect of the shock wave attenuation was found to be most obvious when the Main Charge is 8701,COMP-B followed,and the PBX9404 was not obvious.However the critical pressure of the 8701 was smaller than the PBX9404,So we chose the PBX9404 as the Main Charge of the Evolvable Aimed Warhead.

Keywords   Evolvable  Aimed  Warhead   sympathetic detonation    theoretical analysis    LS-DYNA    Matlab