Abstract: With the increasingly use of FRC (fiber-reinforced composite) in urban lifelines, mechanical properties investigation is very important for disaster resistance, especially the investigation of fatigue properties. Based on the shear-lag model, an usual composite model under cyclic loading is established. According to the Paris formula, the relationship between interfacial fatigue parameters and the number of cycles is obtained under the cyclic loading. Interfacial fatigue properties of this model and the growth of the interfacial fatigue crack are analyzed. And the Poisson ratio is considered also.

Key words: interfacial debonding, fiber, matrix, cyclic loading, crack growth