Verification of a cohesive model based extended finite element method
for ductile crack propagation
Abstract
In this study, an approach utilizing a conjunction of the extended
finite element method (XFEM) and the GTN micro-mechanical damage model
is proposed for predicting the ductile crack propagation of a
mill-annealed Ti-6Al-4V alloy. The cohesive model based XFEM approach is
used to capture the continuous crack propagation process and the GTN
model is applied to describe the constitutive behavior of the material.
Simulations are conducted by using the standard finite element code
ABAQUS following a Newton-Raphson algorithm solution with employing the
user material subroutine of the GTN model. In comparison to the
experimental results of the smooth, notched and cracked titanium
specimens, this approach is shown to be an efficient method for
simulating the ductile crack propagation process under different stress
triaxialities.