Phase field fracture predictions of microscopic bridging behaviour of composite materials

We investigate the role of microstructural bridging on fracture toughness composite materials. To achieve this, a new computational framework is presented that integrates phase field and cohesive zone models to simulate fibre breakage, matrix cracking fibre–matrix debonding. The microstructure represented by an embedded cell at vicinity crack tip, whilst rest sample modelled as anisotropic elastic solid. model first validated against experimental data transverse from single-notched three-point bending tests. Then, extended predict influence grain bridging, brick-and-mortar 3D growth resistance. results show these microstructures are very efficient in enhancing via debonding, breakage deflection. In particular, effect can increase energy dissipated failure more than three orders magnitude, relative bulk matrix; well excess predictions obtained rule mixtures. These shed light microscopic mechanisms provide virtual tool for developing high composites.