A coupled FE-EFG approach for modelling crack growth in ductile materials

摘要

In this work, a coupled finite element-element free Galerkin approach has been used to model crack growth in ductile materials under monotonic and cyclic loads. In this approach, a small discontinuous domain near crack is modelled by EFG method, whereas the rest of the domain is modelled by FEM to exploit the advantages of both the methods. A ramp function has been used in the transition region to maintain die continuity between FE and EFG domains. Two plasticity models (GTN and von-Mises) and three hardening rules (isotropic, kinematic and mixed) have been used to model die nonlinear material behaviour. Four different problems, i.e. single edge notched tension specimen, double edge notched tension specimen, compact tension specimen and three-point bend specimen, are solved under plane strain condition using J-R curve approach. Finally, a CT specimen problem is also solved by coupled approach using three hardening rules and two plasticity models under cyclic loading.