Calibration and evaluation of a combined fracture model of microvoid growth that may compete with shear in the polycrystalline microstructure by means of evolutionary algorithms

Changes of stress or strain ratios during an operation can have an effect on cracking during metalworking processes. Therefore, there is a substantive interest of the aluminum and steel industries of the manufacturing sectors in numerical simulations of the fracture processes of typical structural materials. In this paper, a calibration procedure of material parameters for a combined fracture model of microvoid growth that may compete with shear in the polycrystalline microstructure is described. The paper then proceeds to evaluating the probability of structural failure on the basis of the combined fracture model according to the calibrated material parameters. An assessment of the probability of structural failure is important to improve the quality of manufacturing processes, but also to reduce their costs.