滑移爆轰作用下内爆柱形钢壳层裂的数值研究

NUMERICAL SIMULATION ON THE SPALLATION OF A STEEL CYLINDRICAL SHELL IMPLODED UNDER SLIPPING DETONATION

等发表了滑移爆轰作用下内爆柱形钢壳层裂实验的回收试件测量结果,也给出了相应的数值模拟结果,但两者的差别较大。本文利用损伤度函数方法,对上述实验做了数值研究,所得到的回收试件尺寸数值结果与实验结果十分相符。这说明,损伤度函数方法对研究动态断裂问题有一定的普适性。本文还对实验的柱形钢壳内爆运动过程进行了数值模拟,讨论了临界损伤度α_0取值对断裂面位置、钢层运动轨迹及钢壳运动速度历史的影响,指出了在分析界面不稳定性问题时要注意α_0取值的影响。

The spallation experiment of a steel cylindrical shell imploded under slipping detonation was reported by et al., but the measured and calculated results, showed in that paper, are not in accord very well in values. In this paper, we utilized the method of damage-level function to carry out the numerical studies for the above ex- perimem. The calculated spall locations are quite in accord with that of the 's experiment. It is illustrated that the method of damage-level function we adopted has a certain universal applicability for studying the dynamic fracture problems. The implosion processes of the steel cylindrical shell used in the 's experiments were also analyzer numerically in this paper. The influences of the critical damage-level αc values adopted on the spall locations, the implosion trajectories, and the shell velocity histories were discussed,and the importance of reasonable selection of αc value for analyzing the interface-instability problems was also illustrated.