Numerical Simulation on the Spallation of a Steel Cylindrical Shell Imploded under Slipping Detonation
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摘要: Иванов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Иванов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Иванов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c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c取值的影响。Abstract: The spallation experiment of a steel cylindrical shell imploded under slipping detonation was reported by Иванов 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 experiment. The calculated spall locations are quite in accord with that of the Ивановs 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 Ивановs experiments were also analyzed numerically in this paper. The influences of the critical damage-level c values adopted on the spall locations, the implosion trajectories, and the shell velocity histories were discussed, and the importance of reasonable selection of c value for analyzing the interface-instability problems was also illustrated.
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