Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 82, Issue -, Pages 379-386Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2015.08.013
Keywords
Aluminum alloys; Very high cycle fatigue; Friction stir welding; Fatigue crack initiation; Fatigue strength
Funding
- National Natural Science Foundation of China [11172188, 11302142, 51408382]
- Program for Changjiang Scholars and Innovative Research Team [IRT14R37]
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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. (C) 2015 Published by Elsevier Ltd.
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