作者：石啸海, 戴开达, 陈鹏万, 崔云霄

作者单位：北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081

关键词：战斗部;PBX装药;动态损伤;内聚力裂纹模型;数值模拟

摘要：

为研究战斗部侵彻过程中PBX装药的动态力学性能及损伤情况，进行缩比弹侵彻半无限大混凝土靶板的数值模拟。PBX装药采用内聚力裂纹模型，通过计算PBX装药的损伤演化过程，获得单元裂纹宽度等关键参数，并分析过载、轴向应力及损伤程度，同时计算分析有机玻璃、聚四氟乙烯等材料作为缓冲层对装药动态损伤的影响。结果表明：1）基于内聚力裂纹模型的PBX装药自定义材料模型能很好地模拟装药的动态力学性能及损伤；2）使用缓冲层可以有效地保护战斗部内部装药；3）有机玻璃作缓冲材料用于改善装药力学环境的效果更加明显。

Numerical simulation of dynamic damage of PBX charge during the warhead penetration process

SHI Xiaohai, DAI Kaida, CHEN Pengwan, CUI Yunxiao

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Abstract: To study the dynamic mechanical response and damage of PBX charge in the process of warhead penetration,the numerical simulation of scaled projectile penetrating into semi-infinite concrete target is used.The cohesive crack model (CCM) is used to simulate PBX charge.The key parameters,such as the width of crack,were obtained by computing the damage evolution of PBX charge.Meanwhile,the overload,axial stress and damage degree were analyzed.Simultaneously,the effect of dynamic damage of buffer layer,such as PMMA and PTFE,on the charge is discussed.The results show that 1) the user defined material model based on CCM has good effect to simulate the dynamic mechanical properties and damage of PBX charge;2) the buffer layer can protect internal charge validly and 3) the PMMA is the best buffer material to improve mechanical environment of charge.

Keywords: warhead;PBX charge;dynamic damage;cohesive crack model;numerical simulation

2016, 42(10): 138-142  收稿日期: 2016-4-25;收到修改稿日期: 2016-6-2

基金项目: 

作者简介: 石啸海(1992-),男,山东德州市人,硕士研究生,专业方向为侵彻数值模拟。

参考文献

[1] 应国淼,王国庆. 半穿甲战斗部装药安定性分析[J]. 四川兵工学报,2009,30(5):66-68.
[2] 陈文,张庆明,胡晓东,等. 侵彻过程冲击载荷对装药损伤实验研究[J]. 含能材料,2009,17(3):321-325.
[3] LEFRANCOIS A, LAMBERT P, CHESNET P, et al. Microstructural analysis of HE submitted to penetration experiments:31st, International pyrotechnics seminar,2004[C]//International Pyrotechnics Society,2004.
[4] 许志峰,李亮亮,屈可朋. 缓冲装置对炸药装药抗过载安定性影响研究[J]. 科学技术与工程,2015,15(18):179-182.
[5] 贾宪振,李媛媛,郭洪卫,等. 弹体侵彻混凝土过程中炸药动态响应数值模拟[J]. 科学技术与工程,2012,12(11):2528-2531.
[6] 王伟力,黄雪峰,杨雨潼. 半穿甲战斗部侵彻过程中装药安定性研究[J]. 海军航空工程学院学报,2010,25(1):79-82.
[7] DUGDALE D S. Yielding of steel sheets containing slits[J]. Journal of the Mechanics and Physics of Solids,1960(8):100-104.
[8] BARENBLATT G I. The mathematical theory of equilibrium cracks in brittle fracture[J]. Advance in Applied Mechanics,1962(7):55-129.
[9] ELMARAKBI A M, HU N, FUKUNAGA H. Finite element simulation of delamination growth in composite materials using LS-DYNA[J]. Compos Sci Tech,2009,69(14):2383-2391.
[10] 王永刚,胡剑东,王礼立. 金属材料层裂破坏的内聚力模型[J]. 固体力学学报,2012,33(5):465-470.