Numerical Modeling of Cyclic Softening and Hardening Under Fatigue Loading
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This study presents a numerical investigation into the cyclic softening and hardening behavior of construction steels under fatigue loading. The work focuses on the Fatigue SS (FSS) model, an unconventional plasticity framework capable of capturing inelastic deformation below the macroscopic yield stress [1]. Experimental data from monotonic, fatigue, and incremental step loading tests were used to calibrate the material parameters for SM490, SM570, and F18B steels. The results demonstrate that the FSS model effectively predicts the progressive accumulation of plastic strain and stress evolution under low- and high-cycle fatigue regimes. Special attention is given to the model’s ability to describe stress-strain hysteresis behavior and its role in crack initiation life assessment. Numerical simulations confirm a good correlation with the experimental findings, validating the proposed approach. The study contributes to the advancement of computational methods in fatigue life prediction, enhancing structural reliability assessments in engineering applications.
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