摘要
高聚物粘结炸药(PBX)安全性评估离不开对其力学响应和损伤破坏的刻画。为了准确捕捉PBX炸药的力学行为,以Karagozian&Case模型框架为基础,开展了PBX炸药力学行为数值刻画的研究。修改Karagozian&Case模型中的损伤演化方式,考虑PBX炸药模量、损伤演化模式等压力依赖特性。结合法国原子能委员会Picart等给出的一系列试验数据,修正Karagozian&Case模型中的应变率效应,分析不同压力下PBX炸药拉压子午线之比的取值,处理结构损伤破坏过程中变形局部化的问题,提出数值计算中拉伸失效单元的处理方法。得到的模型很好地刻画了Steven试验中炸药试件的成坑形貌,并成功捕捉到了炸药试件中的拉伸、剪切破坏图像。
The safety assessment of PBX explosive is inseparable from the characterization of its mechanical response and damage. In order to accurately capture the mechanical behavior of PBX explosive, the numerical characterization method of PBX explosive mechanical behavior is studied based on Karagozian & Case (K&C) model framework. The damage evolution mode in the K&C model is modified, and the pressure- dependent characteristics of PBX explosive modulus and damage evolution mode are considered. Based on a series of published experimental data, the strain rate effect in the K&C model was corrected, the ratio of tension to compression meridian of PBX under different pressures was discussed, the deformation localization in the process of structural damage was dealt with, and the treatment of the tensile failure unit in the calculation was presented. The proposed model can be used to well depict the cratering morphology of explosive specimen in the Steven test, and successfully capture the tensile and shear failure images of explosive specimen.
作者
魏强
黄西成
陈刚
陈鹏万
WEI Qiang;HUANG Xicheng;CHEN Gang;CHEN Pengwan(State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2019年第7期1381-1389,共9页
Acta Armamentarii
基金
国家自然科学基金项目(11472257、U1330202、11521062)
关键词
高聚物粘结炸药
拉伸、压缩子午线之比
应变率效应
变形局部化
拉伸失效
polymer bonded explosive
ratio of tensile to compression meridian
strain rate effect
strain localization
tensile failure
