巨視的弾性・高サイクル疲労過程の繰返し塑性挙動

抄録

In order to simulate mechanical fatigue phenomena represented under macroscopically elastic condition, the plastic stretching within a yield surface has to be described, whilst the plastic strain is induced remarkably as the stress approaches the dominant yielding state. In this study, a logistic analysis is conducted for the description of the cyclic loading behavior observed during so-called high cycle fatigue subjected to the cyclic stresses lower than the yield stress, and also an unconventional plasticity model is proposed. The extended elasto-plastic model is applied for metals obeying not only isotropic but also kinematic hardening law. The mechanical responses under cyclic loading conditions are examined briefly and compared with the corresponding experimental results for SN490B.