Abstract
Mode I and mode II fatigue crack growth behavior of adhesive joints of aluminum alloys was investigated in terms of fracture mechanics and fracture surface aspect. In mode I and mode II crack growth testings, DCB specimens and ENF specimens were used respectively. In both of mode I and mode II fatigue crack growth testings, the crack growth resistance was improved by anodizing treatment of adherend. Fracture surface morphology was able to be classified into three types, that is, interfacial fracture, near-interface fracture and cohesive fracture. In the fractured adhesive, the thin surface layers with fracture aspect different from the inside region were observed in SEM observations. In near-interface fracture, crack grew along the boundary of this layer. On the fracture surface of specimens with anodizing treatment, cohesive crack propagation was dominant, regardless of mode. This is the reason for improved crack growth resistance in anodizing specimens.
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