A Study on Phase-Field Models for Brittle Fracture

• DOI: 10.48550/arxiv.1805.07357
• Publication Date: 2018-01-01
• Authors: Fei Zhang; Weizhang Huang; Xianping Li; Shicheng Zhang
• Keywords: Brittle fracture

In the phase-field modeling of brittle fracture, anisotropic constitutive assumptions for degradation stored elastic energy due to fracture are crucial preventing cracking in compression and obtaining physically sound numerical solutions. Three decomposition models, spectral decomposition, volumetric-deviatoric split, an improved their effects on performance studied. Meanwhile, stiffness may lead a small remaining crack surfaces, which violates boundary conditions can cause unphysical openings propagation. A simple yet effective treatment this is proposed: define critically damaged zone with threshold parameter then degrade both active passive energies zone. dynamic mesh adaptation finite element method employed solution corresponding elasticity system. Four examples, including two benchmark ones, one complex systems, based experimental setting, considered. Numerical results show that split together improvement conditions, propagation comparable existing computational results. It also shown not very sensitive defining