Abstract
As a new repair method for steel members with corrosion attack and fatigue damages, bonding patch plates have been proposed and used. One of the concerns of this method is prevention of delamination of patch plates, because the adhemsive stresses concentrate at the end of patch plates. In general, the tensile test of single lap joint is applied for quality control of adhensives. However, the tensile shear strength given by the tensile tests of single lap joint is not available for the evaluation of the prevention of delamination of patch plates. Therefore, in this study, the adhensive stresses in single lap joint under tensile or bending load are theoretically given. Furthermore, it was shown that the energy release rate, which often applied for the design of delamination of patch plates, can be calculated by using adhensive stresses at the end of patch plate given by the theory.
