Fracture Prediction and Correlation of AlSi Hot Stamped Steels with Different Models in LS-DYNA®

Reliable predictions of the fracture behavior in a crash event have become ever important in recent years as they will enable the reduction of physical prototype testing and the acceleration of vehicle development time while maintaining high safety standards. The increasing use of even stronger grades of Advanced High-Strength Steels (AHSS) such as hot-stamped boron steels provides particular challenges to fracture modeling due to their microstructures and processing conditions. This paper provides a brief description of the different fracture criteria and their implementation currently available in LS-DYNA to model ductile failure. The focus is the determination of parameters for selected fracture criteria for AlSi coated press -hardenable steels using calibration tests at the coupon level and supported by FEA simulations.