Stress‐Based Fracture Model to Describe Ductile Fracture Behavior in Various Stress States

Abstract

Being aimed at the strain path–related ductile fracture characteristic, this research develops a two‐component stress‐based DF2016 fracture model with 10 parameters through combining two single‐component corresponding fracture model with the addition form. This model possesses high flexibility to describe the ductile fracture behavior in various stress states. Stress‐based fracture‐related variables of the specimens with 10 different structures for WE43 alloy are captured, and the hardening behavior is with some strength differential effect. These fracture stresses have a strong sensitiveness to stress triaxiality and Lode parameter. Fracture loci of WE43 alloy are constructed by the proposed model with the smaller prediction error of 0.25683 than the stress‐based DF2016 fracture model (0.527). The reliability and high flexibility of the developed model are further uncovered through the description of ductile fracture behavior of AA2024‐T351 alloy. This research provides a valuable tool for predicting fracture failure of metals in engineering applications.