Damage modeling in crashworthiness of dual-phase steel

Dual-Phase steel is an advanced high strength steel that are used recently in auto-body for energy absorption. Fracture is an noticeable factor in crashworthiness of vehicle impact loading. Failure prediction of DP۸۰۰ was investigated in this studying. There are different fracture criteria for damage modeling, but the material behavior cannot be simulated by using them, so a new approach have been used in this studying. The Gurson model in conjunction with the Johnson-Cook damage model is applied to simulate correctly the material behavior. By using a new method in this research, in shear fracture and ductile fracture the active mechanisms are JohnsonCook damage model and Gurson model respectively. Finally, the crashworthiness of a B-Pillar in different conditions is simulated and the fracture is predicted.