An energy-based model of longitudinal splitting in unidirectional fiber-reinforced composites

Unidirectional fiber-reinforced composites are often observed to fail in a longitudinal splitting mode in the fiber direction under far-field compress ive loading with weak lateral confinement. An energy-based model is develop ed based on the principle of minimum potential energy and the evaluation of effective properties to obtain an analytical approximation to the critical stress for longitudinal splitting. The analytic estimate for the compressi ve strength is used to illustrate its dependence on material properties, su rface energy, fiber volume fraction, fiber diameter, and lateral confining pressure. The predictions of the model show good agreement with available e xperimental data.