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Fatigue Crack Growth of Peened Friction Stir-Welded 7075 Aluminum Alloy under Different Load Ratios

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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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Authors and Affiliations

  1. Structures Branch, NASA–Johnson Space Center, Houston, TX, 77058, USA

    Omar Hatamleh

  2. Materials Branch, NASA–Johnson Space Center, Houston, TX, 77058, USA

    Scott Forth

  3. Mechanical Engineering Department, University of South Carolina, Columbia, SC, 29208, USA

    Anthony P. Reynolds

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  1. Omar Hatamleh
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  2. Scott Forth
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  3. Anthony P. Reynolds
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Correspondence to Omar Hatamleh.

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Hatamleh, O., Forth, S. & Reynolds, A.P. Fatigue Crack Growth of Peened Friction Stir-Welded 7075 Aluminum Alloy under Different Load Ratios. J. of Materi Eng and Perform 19, 99–106 (2010). https://doi.org/10.1007/s11665-009-9439-1

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  • DOI: https://doi.org/10.1007/s11665-009-9439-1

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