Evaluation of Surface Residual Stresses in Friction Stir Welds Due to Laser and Shot Peening |
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Authors: | Omar Hatamleh Iris V Rivero Jed Lyons |
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Affiliation: | (1) Structures & Dynamics Branch, NASA-Johnson Space Center, Houston, TX 77058, USA;(2) Industrial Engineering Department, Texas Tech University, Lubbock, TX 79409-3061, USA;(3) Mechanical Engineering Department, University of South Carolina, Columbia, SC 29208, USA |
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Abstract: | The effects of laser, and shot peening on the residual stresses in friction stir welds (FSW) has been investigated. The surface
residual stresses were measured at five different locations across the weld in order to produce an adequate residual stress
profile. The residual stresses before and after sectioning the coupon from the welded plate were also measured, and the effect
of coupon size on the residual stress relaxation was determined and characterized. Measurements indicate that residual stresses
were not uniform along the welded plate, and large variation in stress magnitude could be exhibited at various locations along
the FSW plate. Sectioning resulted in significant residual stress relaxation in the longitudinal direction attributed to the
large change in dimensions in this direction. Overall, laser and shot peening resulted in a significant reduction in tensile
residual stresses at the surface of the specimens. |
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Keywords: | FSW laser peening residual stress shot peening x-ray diffraction |
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