Abstract
Recently, adherend thickness has tended to decrease to lighten the adhesive composite structures. In this study, the mechanical behavior of CFRP adhesive joints was examined in the case in which a thin adherend was used. AE measurement and FEM analysis were performed. The adhesive-strength evaluation method that used the stress singularity parameter was applied to FEM results. Initial failure strength, which was an important factor applying the cyclic load, could be found by AE results. It was clarified that the initial failure strength decreased when thin adherend was used. According to FEM analysis, the initial failure strength could be evaluated by the intensity of the stress singularity. It was clarified that the initial failure strength decreased, since the intensity of the stress singularity at the adhesive edge increased when adherend thickness decreased, and that intensity increased, since the tensile deformation gap between the adherends became widened.
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