OS2133 Prediction of Cyclic Softening and Fatigue Crack Initiation Life of Rolled Steel for Welded Structures (SM400B)

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  • OS2133 溶接構造用圧延鋼材(SM400B)の繰返し軟化挙動と疲労き裂発生寿命の予測

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The plastic deformation within a yield surface has to be described to simulate mechanical fatigue phenomena under macroscopically elastic condition. In this study, a phenomenological plasticity model is proposed for the description of the cyclic softening behavior observed for some carbon steels during so-called the high-cycle fatigue subjected to stresses lower than the yield stress. The model is formulated based on the unconventional plasticity model and is applied for materials obeying isotropic and kinematic hardening law. The mechanical responses and capability for evaluating the initiation life until fatigue cracking are examined briefly.

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