填药柱壳在内部爆炸载荷下的变形和破坏  

Simulation of the deformation and failure of explosive-filled cylinder under internal explosion

作　　者：范书群[1] 李永池[1] 董杰[1] 朱志刚[1] 

机构地区：[1]中国科学技术大学力学和机械工程系,合肥230027

出　　处：《计算力学学报》2009年第1期66-71,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(10272097);国家自然科学联合基金(60776821);教育部博士点基金(20070358037)资助项目

摘　　要：采用一种计及三轴因子的损伤模型,以本构关系的内变量理论为基础得到了热塑性本构关系的普适显式表达式;得到了改进的Johnson-Cook本构模型的增量形式;考虑温度和损伤对材料参数的影响,计入温度和损伤对材料塑性变形发展的耦合作用,给出完备的计算方程组;用Lagrange显示差分的方法对填药柱壳在内部爆炸载荷下的变形和破坏进行了数值模拟,并对结果进行分析,与实验结果进行了比较。The paper considers the cylinder deformation and fragmentation under the internal explosion. A damage model that considers the stress triaxiality is introduced to the cylinder constitutive model based on continuum damage mechanics. The description of the general thermo-viscoplastic constitutive relations is derived based on the internal variable theory and with the modified Johnson-Cook model the specific incremental thermal-plastic constitutive relations are obtained to describe the constitutive relations of the steel cylinder. Damage and temperature effects are coupled to the material parameters so that they influenced the plastic deformation process. The governing equations and the discrete method are given. The governing equations were given out. Numerical simulations are carried out with Lagrange explicit difference method to simulate the deformation and failure of explosive-filled cylinder under internal explosion. Results are obtained and analyzed, which give detailed desc damage process of the cylinder under the load of the internal explosion. with the experimental results and show a good agreement with them. rip A tion of the deformation and nd the results are compared

关 键 词：内部爆炸 破坏 数值模拟 损伤 

分 类 号：O348[理学—固体力学]