Abstract
In this study, in order to investigate the influence of the organic coating applied to aluminum alloy surface on the fatigue characteristics of the Friction Stir Spot Welded joints between aluminum alloy and CFRP, fatigue tests were conducted and the fatigue fracture mechanism and the welding properties were investigated in detail. According to the fatigue tests, the improvement of fatigue strength on the FSSW joint applied with the organic coating was observed compared with the joints without the organic coating. Also, the void occurred inside the CFRP due to the influence of frictional heat during FSSW on the joining interface properties. Moreover, the fatigue fracture mechanism of the joints without the organic coating was found that the interfacial fracture is dominant. On the other hand, for the joints with the organic coating, because of the increase of the interface strength, the cohesive failure initiated inside the CFRP is regarded as the main reason of the fracture. In addition, the welded area of FSSW region was made more consistent by the application of the organic coating on aluminum alloy surface.
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