裂纹奇异点附近点缺陷的应力驱动重分布

H. Rauh, R. Bullough
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引用次数: 3

摘要

提出了裂纹与点缺陷之间弹性相互作用能量中最重要的一项,并将其用于估计在II型载荷和滑移带撞击晶界汇时孤立裂纹应力场中点缺陷重分布的动力学。我们的分析表明,点缺陷应该只迁移到裂纹的尖端,而它们应该同时进入滑移带尖端和相邻的边界界面。得到了在瞬态耗尽和稳态辐照下分离的浓度、数量和通量分布以及总数的明确结果,并加强了先前关于应力驱动过程在材料断裂中的重要性的结论。
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The stress-driven redistribution of point defects in the vicinity of crack-like singularities
The most important term in the energy of the elastic interaction between a crack and a point defect is presented and used to estimate the kinetics of redistribution of point defects in the stress field of an isolated crack under mode II load and a slip band impinging against a grain boundary sink. Our analyses show that the point defects should migrate only to the tip of the crack, whereas they should enter both into the slip band tip and along the adjacent boundary interface. Explicit results are obtained for the concentrations, the number and flux distributions as well as the total numbers segregated in the transient depletion and the steady-state irradiation situation and serve to reinforce previous conclusions regarding the importance of such stress-driven processes in the fracture of materials.
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