Abstract: Using the Chaboche model, the cyclic plasticity and viscoplasticity behaviors of 30Cr1Mo1V steel were described. By experiment, the fatigue and stress relaxation data of 30Cr1Mo1V steel under different stress levels were obtained. According to the experimental data, the parameters of the Chaboche model were obtained gradually. The user subroutine UserMat of the Chaboche model is linked into ANSYS software to simulate the fatigue and creepage behaviors of the material. The result shows that the user subroutine can reflect mechanical behavior of the material well, which provides theoretical foundation for study on fatigue and creepage interaction using the Chaboche model.

Key words: fatigue, creepage, stress relaxation, return map algorithm, experimental data, Chaboche model