1106 延性損傷破壊機構の理論的定式化とFCC単結晶のシミュレーション(OS11. 材料の組織・強度に関するマルチスケールアナリシス(2),オーガナイズドセッション講演)

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In the previous paper, dependence of the driving force of the deformation localization on the physical mechanisms of the elastic stiffness degradation caused by the plastic deformation, which is closely related to changes of ultrasonic wave velocities due to the plastic deformation, was examined in detail. Successively, the new model for ductile fracture initiation was proposed based on the new concept, i.e.. ductile fracture initiation is caused by the jump of wave velocity along the intersected crossing line between two different stationary discontinuity bands characterized by vanishing velocity of an acceleration wave. The micro-crack nucleation caused by the jump of the velocity along intersected crossing line between the two discontinuity bands was verified theoretically by the shock wave theory and analyzed numerically using the theory of ultrasonic wave velocity under the plastic deformation proposed by the author. In the present paper, ductile fracture progress of FCC single crystals characterized by four categories of damage levels, i.e., yielding, localized deformation, micro-crack nucleation and macro-crack and/or void nucleation, is simulated using the finite element crystal plasticity model (FEPM) with built in proposed criteria.
2010-09-23