Investigation of Interfacial Debonding Under Tension-Tension Cyclic Loading
Chen Yanhua(1),Shi Zhifei(1),Zhu Qingjie(2)
(1,School of Civil Engineering, NJTU, Beijing 100044) (2,Hebei Institute of Technology, Tangshan 063009)

Abstract: According to elastic mechanics and fracture mechanics, based on the shear-lag model, an interfacial fatigue debonding property of fiber-reinforced composites under tension-tension cyclic loading is studied. An equivalent Paris formula is established to describe the crack growth. A relations hip among the rate of the interfacial fatigue crack growth, the debonding stress , the interfacial coefficient of friction and the number of cyclic loading is obtained. By numerical simulating computing, mechanical mechanism for interfacial fatigue debonding is analyzed further. In this paper, the degradation of the debonded interface and the non-uniformity of the degradation caused by fatigue loading are considered, and the effect of the Poisson's contraction is considered too.
Keywords: fatigue, interface, composites, debonding, cycle loading.