Abstract
In this study, factors effecting the strength and fatigue life of [0/45/90/-45]2s thermo-plastic and thermo-set bolted joints laminate subjected to thermal-cycle effect has been investigated. The fatigue tests were performed at various stress levels under tension-tension loading with a fatigue frequency of 5 Hz. It found that thermo-plastic component had good fatigue life and bearing stress. Fatigue life is reduced after thermal-cycles loading. The stress distribution of the three kinds of two-bolted joints laminated graphite-epoxy were determined experimentally using photoelasticity to present the stress around the hole edge and across the net-section. Which one component had the ability to transfer load to have small influence of bolt configuration on the gross section failure stress for the laminates.Expanded the Paris Law to fit the residual strength of three cases of the joints suggest a relation between the joint resistance to fatigue and the degree of stress levels. This make is possible to predict the residual strength of composite joints with different configuration.