Phase-Field Modelling of Fracture in Viscoelastic Solids

摘要

The phase-field modeling has emerged as an extremely powerful numerical method to simulate crack propagation with significant success. The crack is herein modeled by a field variable that distinguishes between fully broken and undamaged material. In the proposed phase-field model for crack propagation in viscoelastic solids, a model with a fracture threshold similar to gradient damage theories is developed which can distinguish between fracture behavior in compression and tension. A viscoelastic material model in the framework of finite deformations is used for rubber-like material response. The full model is implemented in the framework of the FE program FEAP and allows both a monolithic and a staggered scheme for the numerical solution. Within FEAP a parameter study is realized. Finally, a summary of the results is presented and an outlook for improvements of the modeling for fracture in viscoelastic solids is given.