Modeling of Ductile Failure in High Strength Steel

Ductile fracture is an important field in dynamic materials research. The simulation of ductile failure by means of numerical codes requires accurate material models that are validated with data obtained from precise high-rate mechanical testing. In this work, a high strength quenched and tempered steel is studied over a wide range of strain rates using different test methods to achieve a range of stress states with numerical computations being used to determine the precise stress and strain rate states for the multiaxial GISSMO model. The consideration of stress state, not only in tensile triaxiality 0.33 and above but also in shear, tension/shear and compression/shear, will lead to greater accuracy in failure predictions for a wide range of applications involving complex multiaxial stress states, particularly for thick and high strength materials.