Applications: Friction Stir Weld |
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Residual Stress Conferences |
(preprint) Prime, M. B., Gnäupel-Herold, T., Baumann, J. A., Lederich, R. J., Bowden, D. M., Sebring, R.J., “Residual Stress Measurements in a Thick, Dissimilar Aluminum Alloy Friction Stir Weld,” Acta Materialia, 54(15), 4013-4021, 2006. (LA-UR-06-0512) *** DOI link if you have access to this journal and want the final article instead of a preprint. paper on the effect of removing the test specimen from a larger plate. "Contour-Method Determination of Parent-Part Residual Stresses Using a Partially Relaxed FSW Test Specimen," (LA-UR-04-2131) For more on residual stress in friction stir welds, see also the papers by Dalle Donna here. Results (see below for details):
Highlights
of this measurement and specimen: (back
to top)
Change in stresses from removing small test specimen: The residual stresses were measured in a 54 mm long test specimen that had been removed from a 457 mm long plate. Because of the short length of the test specimen, the stresses relaxed somewhat when the specimen was removed. In the paper (pdf) listed at the top of the page, a method for calculating how much the stresses relaxed is described. The results of that estimation are below, showing that the peak tensile stresses were relaxed by about 25%. (back to top) Stresses
measured in test specimen (same as results on top of page, just color
scale changed) Estimated
stress in parent plate prior to stress relaxation caused by removing specimen
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