A finite fracture mechanics formulation to predict fibre kinking and splitting in CFRP under combined longitudinal compression and in-plane shear

An analytical model to predict fibre kinking and splitting in CFRP under combined longitudinal compression and in-plane shear is presented. The model is based on the fracture mechanics of microcracks and split formation between the fibres during kink-band formation or splitting. A simple criterion which can readily be used in design is derived from the model. The predictions from this criterion are compared with experimental data and numerical results available in the literature, and are found to be in good agreement.

► We model fibre kinking and splitting using a finite fracture mechanics approach.
► A simple failure criterion which can be used in design is derived.
► Failure envelopes for longitudinal compression and in-plane shear are accurately predicted.