高应变率下纯铝损伤演化过程的数值模拟  

Simulation of Damage Evolution of Pure Aluminum Under High Strain-rate

作　　者：邓玉荣[1,2] 祁美兰[1] 

机构地区：[1]武汉理工大学理学院,武汉430070 [2]华中师范大学物理科学与技术学院,武汉430079

出　　处：《武汉理工大学学报》2009年第17期78-80,共3页Journal of Wuhan University of Technology

基　　金：国家自然科学基金NSAF项目(10876014);冲击波物理与爆轰物理重点实验室项目(9140C6701010701)

摘　　要：将纯铝样品在一级轻气炮(Φ100 mm)上进行动态冲击加载,用VISAR系统测量样品自由面的速度历史,获得纯铝在2种弹速下的自由面速度剖面;以实验为基础,从不同角度对纯铝材料进行了数值模拟,给出了材料的x-t图(特征线图)、样品内部微损伤分布与回收后损伤统计结果的对比以及材料内部微损伤随时间的演化等信息。结果表明:数值模拟结果很好地反映了材料在高应变加载下的损伤演化过程,其结果基本与实验结果吻合。Using light-gas gun loading and VISAR （Laser velocity Intervene instrument） technology, pure aluminum samples were shocked by a flyer with 236.3 m/s and 320 m/s velocity. The free-surface velocity curves of the sample under two velocities were obtained. Based on experiments, the numerical simulation of aluminum was finished. The x-t figure, the damage contrast between experiments and simulation, and the information of micro damage grows with time have been obtained. It shows that the simulation results have responsed the process of damage evolution under the high strain rate well, and the results were approximately in accordance with the experimental ones.

关 键 词：自由面速度 显微分析 损伤演化 层裂 数值模拟 

分 类 号：O346.1[理学—固体力学]