船体構造用多結晶金属材料の繰返し塑性変形挙動の数値シュミレーションに関する研究 (その1) : 面心立方二次元モデルの計算

概要

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In order to improve a prediction method of the crack initiation or failure life, it is needed to develop a simulation method which estimate macroscopic deformation behavior from microstructural models. In this report, we analyze ununiform deformation of f.c.c. pollycrystalline using 2-Dimentioal FEM model, and evaluate propriety of models for movement and interaction of dislocations. Results of the analyses are summarized as follows: 1) It is possible to represent cyclic plastic behavior of real materials if dislocation structures generated during plastic deformation raise c.r.s.s. only by long-range stress or these structures disappear during unloading. 2) There is concentration of plastic strain on grain boundary of a crystal which faces free surface and is next to crystals with small plastic deformation. It is supposed that PSB (persistent slip band), which cause fatigue failure, appear in such regions.
1996-03-25