Abstract
The aim of this study is to simulate the micromechanics of dual phase (DP) 600 steel during tension-compression deformation and apply the calculated stress-strain curves to identify material parameters of phenomenological constitutive models with focus on Bauschinger effects. Image-based and statistical representative volume element (RVE) models were built to perform virtual tension-compression tests. The effects of mesh size, dimension, martensite volume fraction and martensitic particle size on stress-strain response were also studied. The results showed that the RVE models gave good overall prediction compared with experiment data. Material parameters of Chaboche nonlinear kinematic model were identified by fitting the resulted cyclic strain-stress curve from virtual tests using optimization software LS-OPT.
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