Through thickness property variations in friction stir welded AA6061 joint fatigued in very high cycle fatigue regime

Chao He 1 Yongjie Liu 2 Jiangfeng Dong 1 Qingyuan Wang 1 Danièle Wagner 3 Claude Bathias 3
1 Key Laboratory of Energy Engineering Safety and Disaster Mechanics
2 Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province
3 LEME - Laboratoire Energétique Mécanique Electromagnétisme
Abstract : Ultrasonic fatigue tests were performed on friction stir welded AA6061 joint to investigate very high cycle fatigue (VHCF) behaviors. As a result, almost all the fatigue cracks are initiated from local plastic slip markings around the boundary between thermo-mechanically affected zone and heat affected zone. The fatigue strength decreases from the top to root of the welded joint, owing to the variation of plastic deformation history and temperature distribution through the thickness. In fractography, the fatigue crack initiation site is surrounded by a semicircular flat zone, of which the formation in VHCF regime accounts for more than 98% of the total fatigue life.
Keywords : Fatigue strength Fatigue crack initiation Aluminum alloys Very high cycle fatigue Friction stir welding
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Chao He, Yongjie Liu, Jiangfeng Dong, Qingyuan Wang, Danièle Wagner, et al.. Through thickness property variations in friction stir welded AA6061 joint fatigued in very high cycle fatigue regime. International Journal of Fatigue, Elsevier, 2016, 82, Part 3, pp.379-386. ⟨10.1016/j.ijfatigue.2015.08.013⟩. ⟨hal-01687110⟩

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