EXPERIMENTAL STUDY ON CYCLIC BOND BEHAVIOR BETWEEN CFRP AND STEEL

Bond behaivor between carbon fiber-reinforced polymer (CFRP) and steel is recognized important to ensure load transfer and consequently retrofitting efficiency in external bonding repair schemes. This study presents an experimental study on CFRP-to-steel single-lap shear joints subjected to cyclic loading. Various fatigue loading amplitudes were considered. All the specimens fractured by cohesive failure. Fatigue life of the samples gradually reduced with the increased loading levels. With the fatigue cycles elapsed, the bond stiffness declined whereas the residual slip increased. Development of the damage index versus the normalized fatigue cycle number was derived, which was approximately the same among the scenarios with various loadings.