Coupled phase field finite element model for crack propagation in elastic polycrystalline microstructures

This paper is aimed at the development of a coupled finite element-phase field modeling framework for simulating fracture processes in anisotropic elastic materials under finite deformation conditions with tension-compression asymmetry of crack phase. A novel Helmholtz free energy density is proposed in terms of a phase field order parameter dependent elastic Green-Lagrange strain tensor. It accommodates anisotropy of the material and unilateral...