Phase field modelling of the microstructural fracture and bridging behaviours of composite materials

A new numerical framework to predict the crack growth resistance of composite material is presented. The model integrates a phase field fracture model and a cohesive zone formulation to predict the microscale fracture and bridging behaviour. The integrated framework is firstly validated against experimental results. It is then used to quantify the role of previously unexplored microstructures, including features such as void inclusions, grain-bridging, brick-and-mortar and 3D fibre bridging. This modelling framework provides a virtual platform for designing optimal microstructures of high fracture toughness.