基于内聚裂纹模型的高聚物粘结炸药模拟材料动态巴西实验的数值模拟  

Numerical Simulation of Dynamic Brazilian Test of Polymer Bonded Explosive Simulant Based on Cohesive Crack Model

作　　者：崔云霄[1,2] 陈鹏万[1] David A.Cendon 戴开达[1] 钟方平[2] CUI Yun-xiao CHEN Peng-wan David A. Cendon DAI Kai-da ZHONG Fang-ping(State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 10081, China Northwest Institute of Nuclear Technology, Xi＇an 710024, Shaanxi, China Technical University of Madrid, Madrid 28040, Spain)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]西北核技术研究所,陕西西安710024 [3]马德里理工大学,西班牙马德里28040

出　　处：《兵工学报》2016年第9期1639-1645,共7页Acta Armamentarii

基　　金：国家自然科学基金项目(11202027、11221202、U1330202)

摘　　要：高聚物粘结炸药(PBX)是战斗部的关键组成部分,其动态力学行为,特别是动态断裂特性关系到战斗部的安全性和使用可靠性。基于内聚裂纹模型,对PBX模拟材料(PBX-M)的动态巴西实验进行数值模拟,对比霍普金森杆实验中测得的拉伸应力曲线,以及高速摄像结合数字图像相关方法得到的试样表面位移场和应变场。对比结果发现,拉伸应力峰值的数值模拟结果比实验结果小约5%,拉应变集中带的数值模拟结果与实验结果的偏差小于15%,验证了内聚裂纹模型的有效性。根据数值模拟结果,探讨了PBX-M试样在动态巴西实验过程中的起裂和裂纹扩展规律,给出了裂纹宽度的定量化信息。Polymer bonded explosive （PBX） is the key component of warhead. The dynamic behaviors of PBX, especially dynamic fracture behavior, are crucial issues on the safety and reliability of warhead. By introducing cohesive crack model （CCM） , the dynamic explicit software LS-DYNA is used to simulate the dynamic Brazilian experiment on polymer bonded explosive simulant （PBX-M）. By comparing with time history of tensile stress obtained by the strain gauge glued on the Hopkinson bar, the displacement fields and strain fields obtained by digital image correlation and high-speed camera, it is found that the tensile stress peak value obtained by numerical simulation is 5% smaller than the experimental result, and the deviation of the concentration zone of tensile strain from experimental data is less than 15%. Thus the validity of CCM is confirmed. The law of crack initiation and propagation of PBX-M sample during dynamic Brazilian experiment is studied from the results of numerical simulation. The quantitative information about crack width in sample is given.

关 键 词：兵器科学与技术 内聚裂纹模型 动态巴西实验 高聚物粘结炸药 数字图像相关方法 

分 类 号：O347.3[理学—固体力学] TQ560.71[理学—力学]