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利用二维离散位错动力学方法,研究了边界条件对计算机模拟疲劳Cu单晶位错花样的影响,结果表明:边界条件在模拟位错花样这类多体问题时是非常重要的;在其它模拟机制均完全相同的情况下,不同边界条件会形成不同的模拟结果,自由空间边界条件是最简单、也是最不现实的边界条件,模拟结果与实验结果相差甚远;而一维最近邻周期性边界条件与二维近邻周期性边界条件的模拟结果基本相同,与Cu单晶早期疲劳位错花样的实验比较吻合。
The effects of boundary conditions on computer simulation of fatigue Cu single crystal dislocation patterns were studied by two-dimensional discrete dislocation dynamics. The results show that the boundary conditions are very important in simulating multi-body problems such as dislocation patterns. Under the condition that the simulation mechanisms are all the same, different boundary conditions will result in different simulation results. The free space boundary conditions are the simplest and most unrealistic boundary conditions, and the simulation results are far from the experimental ones. One-dimensional nearest neighbor cycles The simulation results of the boundary conditions are almost the same as those of the periodic boundary conditions of two-dimensional neighbors, which are in good agreement with the experiment of early fatigue dislocation patterns in Cu single crystals.