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In this study, experimental and numerical analysis of pearlitic transformation plasticity were performed in a three-point bending loading system. First the experiments were performed in bending and tensile-compressive loading systems with the same austenitization condition. The obtained pearlitic transformation plasticity coefficient for S45C steel was different for the each loading system. Therefore a new constitutive equation which called Drucker-Prager model was proposed to consider the relationship between tensile and compressive experimental results. This new model shows the dependence of hydrostatic stress. To evaluate the validity of this model, a three-point bending test was simulated with Abaqus Standard for both von Mises type and Drucker-Prager type models. The theory of phase transformation was coded in user subroutines for the each model. The simulation results (von Mises and Drucker-Prager) were compared with experimental results of tree-point bending system. The results show that the Drucker-Prager model is exactly match to the experimental results of bending test, but the results of von Mises model are different to the experimental results.

Experimental and Numerical Studies of Pearlitic Transformation Plasticity in S45C Steel Subjected to Bending Loading System