ABSTRACT
The RTCL damage criterion has a relatively simple definition and takes into account the stress triaxiality, which is suggested as a key index affecting the fracture of ductile materials. In numerical simulations, the critical failure strain at which fracture occurs is also influenced by mesh size. In this study, Quasi-static tensile tests using round bars and plate specimens were performed. The RTCL damage criterion was modified through non-linear fitting means into a mesh size-dependent criterion to improve the accuracy of prediction. A VUMAT subroutine was established and implemented into commercial code ABAQUS 2018. Comparison of numerical results shows that the mesh size effects are significantly improved, in a general sense. This study shows a simple and convenient means of improving the RTCL damage criterion and verifying its effectiveness, which is expected to be applied in engineering practice.
