The fatigue behavior of friction stir spot welds in magnesium AZ31 alloy is experimentally investigated and modeled. The friction stir spot welds employed in this study are representative of preliminary welds made in developing the joining process for potential use in automobile manufacturing. Load control cyclic tests were conducted on single weld lap-shear coupons to determine fatigue life properties. Optical fractography of the failed fatigue coupons revealed that fatigue cracks initiated from the interfacial “hook” and eventually failed by either nugget pullout or full width separation, depending on the cyclic load amplitude. The failure modes of the magnesium AZ31 alloy were similar to the aluminum alloys of comparable friction stir spot welds. To predict the fatigue life of the lap-joint coupons, a crack growth modeling approach based on a kinked crack stress intensity solution was used. The fatigue model predictions compared well to the experimental fatigue life results, despite an approximate stress intensity factor solution for this weld geometry. The experiments and modeling conducted in this study suggest that the size of the interfacial hook, which comes about from the speed, depth of plunge, dwell time, and tool configuration of the friction stir spot weld process, is a major contributor to the fatigue life of the joint.
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October 2010
Research Papers
Fatigue Characterization and Modeling of Friction Stir Spot Welds in Magnesium AZ31 Alloy
J. B. Jordon,
J. B. Jordon
Department of Mechanical Engineering,
The University of Alabama
, Tuscaloosa, AL 35487
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M. F. Horstemeyer,
M. F. Horstemeyer
Department of Mechanical Engineering and Center for Advanced Vehicular Systems (CAVS),
Mississippi State University
, Mississippi State, MS 39762
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S. R. Daniewicz,
S. R. Daniewicz
Department of Mechanical Engineering,
Mississippi State University
, Mississippi State, MS 39762
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H. Badarinarayan,
H. Badarinarayan
Automotive Products Research Laboratory,
Hitachi America Limited
, Farmington Hills, MI 48335
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J. Grantham
J. Grantham
Center for Advanced Vehicular Systems (CAVS),
Mississippi State University
, Mississippi State, MS 39762
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J. B. Jordon
Department of Mechanical Engineering,
The University of Alabama
, Tuscaloosa, AL 35487
M. F. Horstemeyer
Department of Mechanical Engineering and Center for Advanced Vehicular Systems (CAVS),
Mississippi State University
, Mississippi State, MS 39762
S. R. Daniewicz
Department of Mechanical Engineering,
Mississippi State University
, Mississippi State, MS 39762
H. Badarinarayan
Automotive Products Research Laboratory,
Hitachi America Limited
, Farmington Hills, MI 48335
J. Grantham
Center for Advanced Vehicular Systems (CAVS),
Mississippi State University
, Mississippi State, MS 39762J. Eng. Mater. Technol. Oct 2010, 132(4): 041008 (10 pages)
Published Online: September 29, 2010
Article history
Received:
September 16, 2009
Revised:
July 23, 2010
Online:
September 29, 2010
Published:
September 29, 2010
Citation
Jordon, J. B., Horstemeyer, M. F., Daniewicz, S. R., Badarinarayan, H., and Grantham, J. (September 29, 2010). "Fatigue Characterization and Modeling of Friction Stir Spot Welds in Magnesium AZ31 Alloy." ASME. J. Eng. Mater. Technol. October 2010; 132(4): 041008. https://doi.org/10.1115/1.4002330
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