Ductile fracture modeling of DH36 grade steels

초록

A Hosford-Coulomb type ductile fracture surface was developed for DH36 grade steels. The fracture experiments reportedin the literature, which consist of tests with notched tensile specimens, tensile specimens with a central hole, shear specimen anddisc specimens for punch specimens, were utilized in a detailedfinite element analysis of each experiment to evaluate the evolution of local stress and strain fields and identify plasticity andfracture response of DH36. The developed plasticity model consists of a von Mises yield surface, an associated flow rule and acombined Swift-Voce type isotropic hardening rule. The loadingpaths to fracture initiation were determined in terms of stress triaxiality and normalized Lode angle parameter histories. Finally,the Hosford-Coulomb fracture surface was calibrated using thefinite element analysis results and adapting a linear damage accumulation law. © 2018 ASME.