Influence of the Calibration Test on the Fracture Initiation Prediction in Rectangular Cup Drawing Process T. A. Akşen1,∗, B. Şener2, E. Esener3, M. Fırat1 1 Department of Mechanical Engineering, The University of Sakarya, Sakarya 54050, Turkey 2 Department of Mechanical Engineering, Yildiz Technical University, Istanbul 34349 Turkey 3 Department of Mechanical Engineering, Bilecik Şeyh Edebali University, Bilecik 11210, Turkey ∗ ardaaksen@sakarya.edu.tr Keywords: Rectangular cup drawing, Plasticity, Polynomial yield criterion. In the cup drawing process, it is aimed for the sheet metal to be formed into the desired shape without going through failure. Tearing is one of the failure types observed in the cup drawing processes and leads to material loss. Tearing failure is mainly relevant to the geometry of the die tools, mechanical properties of the material, lubrication conditions, and blank holder force. Among these parameters, mechanical features and the yield criterion are essential for tearing performance. In the present study, the tearing failure in a rectangular cup drawing process was assessed for the AISI304 austenitic stainless steel that is prevalently employed in the automotive industry. A plasticity model, including the fourth-order complete polynomial-based yield criterion and a fracture model regarding the plastic work concentration, was implemented to predict the tearing failure. Furthermore, the fracture model was calibrated through the physical uniaxial tensile test and a bulge test in order to distinguish the difference in plastic work damage indicator acquired by different loading paths. It was observed that the prediction performance was noticeably increased when the damage indicator from the bulge test was employed. Moreover, the material model involving the complete polynomial yield criterion and the fracture model could accurately estimate the crack initiation location and the propagation path. 120
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