Importance of Deviatoric Stress in Modeling Void Growth in Ductile Fracture

摘要

In this paper, we extend an upper bound result of Cocks (1989) to obtain a formula for porosity growth in ductile metals. Pressure and deviatoric stress are included. The matrix plasticity model involves the plastic strain rate as a power of the deviatoric stress, with a yield stress. The results show that the deviatoric stress cannot be neglected in calculating the porosity growth, even for high triaxialities.