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1 Journal of Theoretical and Applied Mechanics

1 2024

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Study on ductile fracture criterion applied to shear fracture prediction of DP780 sheet

Wu Jiaxiong, Sun Xuguang, Sun Xiaoce, Chang Fu, Yang Shudi, Tan Senqi

Journal of Theoretical and Applied Mechanics

2024

Vol. 62 nr 1

143--156

With the development of automotive lightweight technology, the improvement of the design of body sheet metal forming processes has gradually become a research focus. Advanced high- -strength dual-phase steel is the main material for lightweight vehicle bodies, and exploring its accurate ductile fracture criteria plays an important role in predicting the forming fracture behavior of the sheet metal. The characterizations of the plastic behavior of the DP780 sheet before fracture were performed by the Swift hardening model. Three sets of tests from pure shear to tensile-shear stress states are designed to calibrate the ductile fracture parameters of Lou-Huh, Cockcroft-Latham, and Rice-Tracey criteria. The calibrated parameters are used to predict tensile shear test fractures and punching fractures at small bend fillets of molds. The results show the Lou-Huh criterion can accurately predict the shear fracture behavior of the DP780 sheet in the low-stress triaxiality (0.08-0.33).