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Fatigue Crack Growth of Peened Friction Stir-Welded 7075 Aluminum Alloy under Different Load Ratios |
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| Authors: | Omar Hatamleh Scott Forth Anthony P Reynolds |
| Affiliation: | (1) Structures Branch, NASA–Johnson Space Center, Houston, TX 77058, USA;(2) Materials Branch, NASA–Johnson Space Center, Houston, TX 77058, USA;(3) Mechanical Engineering Department, University of South Carolina, Columbia, SC 29208, USA |
| Abstract: | The effect of peening on the fatigue crack growth performance of friction stir-welded 7075 aluminum alloy was investigated. The fatigue crack growth rates were assessed for laser- and shot-peening conditions at stress ratios (R) of 0.1 and 0.7. The surface and through thickness residual stress distributions were characterized for the different regions in the weld. The results indicate a significant reduction in fatigue crack growth rates using laser peening compared to shot peening and the as-welded condition. The effect of the compressive stresses obtained through laser peening was deemed responsible for increasing the resistance to fatigue crack growth of the welds. |
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