Fracture failure model analysis of 1500 MPa hot forming steel based on GISSMO failure criterion
Taking CR1000/1500HS as the research object,based on the GISSMO fracture failure criterion,five kinds of test samples were designed to characterize different failure modes.Based on the universal tensile testing machine and DIC test system,the force-dis-placement curves and the ultimate plastic strain at the fracture time of different samples during tensile process were obtained.Based on LS-DYNA,the simulation analysis model of each failure sample was built,and the stress triaxiality of the fracture area of each sample was extracted.The fracture failure curves and plastic instability curves were obtained by fitting,and other model parameters were obtained by iteration.The dynamic three-point bending impact test and simulation model of the car door anti-collision beam were used to analyze the bearing characteristics.The difference of force-displacement curves between the GISSMO failure model,the traditional strain failure model and the test was compared to verify the accuracy of the failure model.The results show that the Swift and Hockett-Sherby mixed hardening model can accurately describe the plastic deformation behavior of the material,and the error of the key parameters is less than 5%.The key parameters of the bearing characteristics and the bearing capacity-displacement curves of the car door anti-collision beam which obtained by the GISSMO failure model are consistent with the test results,and the error is less than 5%.The error of the results obtained by the tradi-tional strain failure criterion is large,and the error of the maximum displacement reaches 30%.It indicates that the material model based on GISSMO failure criterion can accurately characterize the plastic deformation behavior and fracture failure behavior of CR1000/1500HS.
hot forming steeldoor anti-collision beamfracture failure modelGISSMO fracture failure criterion
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