Characterization of Unified Material Parameters in Elasto-Plastic Continuum Approach
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The stabilized cyclic behavior of a material is of particular interest in low cycle fatigue life prediction since the crack initiation prediction is generally based on it. Therefore, determination of optimum parameters to find the stabilized hysteresis loop in an elasto-plastic steel behavior is an important step. The aim of this study is to correlate the hardening parameters of two well-known plasticity models, and determine the unified material parameters evocatively to model the inelastic behavior of stainless steel. For better description of cyclic hardening/softening observed in the experiment, we introduce two isotropic hardening variables to the material of interest. We integrate the models by the implicit integration scheme and calibrate the mathematical models with the experimental stabilized loops available in the literature. Attempts are made to simulate the stabilized hysteresis loops in ABAQUS by means of UMAT subroutine for the considered elasto-plastic constitutive models using the determined material parameters. The predicted stabilized loops with the determined parameters show good agreement with the experimental results signifying the validity of the parameter determination scheme and correlation of hardening parameters between the selected models
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