OS0514 繰返し負荷を受ける双結晶における振幅依存性に関する結晶塑性解析(微視構造を有する材料の変形と破壊,オーガナイズドセッション)

概要

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Strain-amplitude-dependent cyclic loading behavior of compatible type FCC bi-crystal is investigated by crystal plasticity finite element analysis. Bi-crystal models without and with subgrain (slight mis-orientation in each grain of the bi-crystal) are used to evaluate accumulations of geometrically necessary dislocations (GNDs) during cyclic loading with constant strain amplitudes. The result of the analysis shows that GNDs norm density distribution and the increase in the average GNDs norm density are affected by the crystal orientation. Comparing to the result of bi-crystal model without subgrain, additional increase in the average GNDs norm density can be found in the result of bi-crystal model with subgrain. The result also shows the qualitatively different increase in the average GNDs norm density during cyclic loading depending on the strain amplitude. The difference is discussed from the viewpoint of the strain-amplitude-dependent activation of secondary slip system.
2009-07-24