Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 38, Issue -, Pages 25-35Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2011.11.003
Keywords
Spot friction weld; Friction stir spot weld; Stress intensity factor; Fatigue; Cross-tension specimen
Funding
- National Science Council [96-2221-E-194-047, 97-2221-E-194-014, 98-2221-E-194-007-MY3]
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Failure modes of spot friction welds (SFWs) in cross-tension specimens of aluminum 6061-T6 sheets are investigated. Micrographs of the SFWs before and after failure under quasi-static and cyclic loading conditions are examined. Two different nugget pullout failure modes can be seen. A fatigue crack growth model based on the paths of the dominant kinked fatigue cracks is adopted to estimate the fatigue lives of SFWs. The computational stress intensity factors for finite kinked cracks and the Paris law for fatigue crack propagation are considered. The fatigue life estimations based on this model agree well with the experimental results. (C) 2011 Elsevier Ltd. All rights reserved.
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