Abstract
This study investigates an effect of time-dependent debonding propagation of fiber/matrix interface and that of stress concentrations to adjacent fibers from broken fibers on creep rupture lifetime in unidirectional composites. Above two phenomena are concerned to reduce materials strength and effect on creep rupture lifetime in unidirectional composites. A creep rupture model that takes into account the decrease of rupture strain due to time-dependent inter facial debonding propagation, based on the GLS rule is proposed and the rupture lifetime is predicted. It was found that the rupture lifetime is strongly dominated by the interfacial debonding propagation rate, and rupture lifetime is shortened considerably in case that time-dependent debonding propagation is remarkable. Subsequently, the change in the rupture strain due to the stress concentration without interfacial debonding propagation is estimated using a 3D shear-lag model and the rupture lifetime taking into account stress concentration is predicted using the McLean's creep model. Prediction result is compared with the result of Curtin-McLean model in which the stress concentration is not taken into account and the effect of stress concentration is investigated.
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