Fatigue damage growth and fatigue life of unidirectional composites

A micromechanical model is developed for the prediction of growth rate fatigue damage zones in unidirectional fibre composites subjected to cyclic tension-tension loading. The occurs by progressive breaks caused debond crack tip stress fields fibres that have broken earlier load cycles. tips are taken advance along due a slip-induced decrease frictional sliding shear acting debonded parts undergo repeated forward and reverse slip. life calculated as number cycles reach critical size where rapid composite failure can occur longitudinal splitting cracks connecting within specimen. parameter study performed explore how depend on microscale parameters (mechanical properties fibre, matrix fibre/matrix interface).