Simulation of the influence of Lode parameter on ductile fracture using an ellipsoidal void model

The influence of the Lode parameter (mu) on ductile fracture is simulated using an ellipsoidal void model proposed previously by the author, and is analyzed using an elementary theory proposed in this study. The equivalent strain at fracture calculated using the ellipsoidal void model in the case of mu = +1 is almost identical to that in the case of mu =-1. The equivalent strain at fracture calculated using the ellipsoidal void model in the case of mu = +/- 1 is larger than that in the case of mu = 0. The void shape and the void configuration at fracture calculated using the ellipsoidal void model significantly depend on the stress triaxiality but scarcely depend on the Lode parameter. The proposed elementary theory indicates that the equivalent strain at fracture in the case of mu = +/- 1 is 2/root 3 times larger than that in the case of mu= 0. The equivalent strain at fracture analyzed using the elementary theory almost agrees with that calculated using the ellipsoidal void model. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The influence of the Lode parameter on ductile fracture was investigated using an ellipsoidal void model and elementary theory. It was found that the void shape and configuration at fracture depend more on stress triaxiality than the Lode parameter. Additionally, the equivalent strain at fracture when mu = +/- 1 is 2/√3 times larger than when mu = 0.