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

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.