Refilled friction stir spot weld (FSSW) is recognized as a potential replacement for riveting due to many advantages. For the application in aircraft structures, fatigue crack growth (FCG) behavior is essential to maintain structural integrity, and has been seldom reported up to now. In this work, FCG behaviors of similar and dissimilar refilled FSSW joints for typical aluminum alloy sheets were experimentally studied, and were compared with those of riveted joints. The mechanisms for the relevant phenomena were also investigated with the aid of fractography. The initial crack along the central line of the spot welds was found to tend to propagate straight through the weld in similar 2A12-T42 joints, while it was more likely to propagate along the periphery of the refilled stir zone in similar 2024-T3 joints. Due to finer grain in the stir zone and the “bridging effect” of the welds, FCG rate of both 2024-T3 and 7075-T62 refilled FSSW specimen was lower than that of base material or corresponding riveted specimen (before the crack propagated into the rivet hole). However, riveted specimen possessed longer fatigue life because the crack was stopped for a long test period when it grew into the rivet hole.
Fatigue Crack Growth Performance of Refilled Friction Stir Spot Welds in Similar and Dissimilar Aluminum Alloy Joints
Lect. Notes Electrical Eng.
Proceedings of the 5th China Aeronautical Science and Technology Conference ; Kapitel : 22 ; 209-219
2021-11-02
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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