In order to accurately predict the forming limit curve of advanced high-strength dual-phase steel,the MMC fracture model which can accurately predict the shear fracture effect was substituted into the numerical simulation.According to the Nakazima test results and numerical simulation of DP590,DP780,DP980 and DP1180 at room temperature,the Nakazima fracture prediction models for four kinds of steel sheets were established,and the FLC0 was accurately calculated via simulation.The forming limit curve(FLC)based on MMC fracture criterion was established and parameterized.The results show that the forming limit curve based on MMC criterion has higher accuracy.
维普
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