The increased use of fibre-reinforced polymers (FRP) in industry demands for methods to predict damage and fracture throughout the life-cycle of a FRP structure. Modelling crack propagation in FRPs is a challenging task due to the combination of materials with different crack resistances in matrix, fibre and interfacial regions.
One established approach in general to describe crack propagation is the phase-field method. We use a model for crack propagation in multiphase regions and modify its heterogeneous crack resistance to incorporate interfacial strength. Mechanical quantities at solid-solid transition regions are calculated with respect to their jump conditions and influence the driving force for crack growth. We validate the extended model experiments comparing its qualtive and quantive behaviour. and systematically analyze the crack propagation for fibre-reinforced polymer microstructures with different fibre distributions. The results of the pull-out simulations are compared with experimental findings.