Abstract
Delayed fractures in carbon-fiber-reinforced polymer matrix composites could be observed even at room temperature due to an accumulation of micromechanical damages, such as interfacial debondings or fiber breaks. In this study, the creep-rupture time of unidirectional composites consisting of carbon fiber and vinylester resin is predicted under consideration of the progress of interfacial debonding, which corresponds to an increase of stress recovery length, and which is accompanied by a fiber break. The time-dependent rupture strain of unidirectional composites is calculated based on the global load sharing theory, which takes into account an increase of the stress recovery length, which is determined using carbon/vinylester single-fiber composite. The creep rupture time of unidirectional composites is formulated, and the prediction of the time-dependent rupture strain decrease are verified by a comparison between the residual strength of the unidirectional composite after a fixed displacement test and the calculated results at that condition.
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