To predict the shear fracture, tests of advanced high-strength DP steels have been carried
out, and fracture models of DP steels have been established using the MMC fracture model.
The MMC fracture parameters were obtained through multiple sets of experiments and
stress triaxiality solved by simulation. The result was verified by stretch-bending, Nakazima
tests and simulations. It shows that the MMC criterion is suitable for predicting ductile
fracture of DP980, 1180. The correlation between the parameters of the MMC criterion and
DP steel material properties can reduce the amount of tests data required.
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