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  • 1
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    Evaluation of Surface Residual Stresses in Friction Stir Welds Due to Laser and Shot Peening (2007)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: 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.
    Keywords: Metals and Metallic Materials
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  • 2
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    The Effects of Laser Peening and Shot Peening on Mechanical Properties in Friction Stir Welded 7075-T7351 Aluminum (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Peening techniques like laser peening and shot peening were used to modify the surface of friction stir welded 7075-T7351 Aluminum Alloy specimens. The tensile coupons were machined such as the loading was applied in a direction perpendicular to the weld direction. The peening effects on the global and local mechanical properties through the different regions of the weld were characterized and assessed. The surface hardness levels resulting from various peening techniques were also investigated for both sides of the welds. Shot peening resulted in an increase to surface hardness levels, but no improvement was noticed on the mechanical properties. In contrast, mechanical properties were improved by laser peening when compared to the unpeened material.
    Keywords: Metals and Metallic Materials
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  • 3
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    Laser Peening and Shot Peening Effects on Fatigue Life and Surface Roughness of Friction Stir Welded 7075-T7351 Aluminum (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: The effects of laser peening, shot peening, and a combination of both on the fatigue life of Friction Stir Welds (FSW) was investigated. The fatigue samples consisted of dog bone specimens and the loading was applied in a direction perpendicular to the weld direction. Several laser peening conditions with different intensities, durations, and peening order were tested to obtain the optimum peening parameters. The surface roughness resulting from various peening techniques was assessed and characterized. The results indicate a significant increase in fatigue life using laser peening compared to shot peened versus their native welded specimens.
    Keywords: Metals and Metallic Materials
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  • 4
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    Laser Peening Effects on Friction Stir Welding (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: No abstract available
    Keywords: Metals and Metallic Materials
    Type: JSC-CN-25865
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  • 5
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    Fatigue Crack Growth in Peened Friction Stir Welds (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Friction stir welding induces residual stresses that accelerates fatigue crack growth in the weld nugget. Shot peening over the weld had little effect on growth rate. Laser peening over the weld retarded the growth rate: Final crack growth rate was comparable to the base, un-welded material. Crack tunneling evident from residual compressive stresses. 2195-T8 fracture surfaces were highly textured. Texturing makes comparisons difficult as the material system is affecting the data as much as the processing. Material usage becoming more common in space applications requiring additional work to develop useful datasets for damage tolerance analyses.
    Keywords: Metals and Metallic Materials
    Type: International Conference on Laser Peening; Dec 15, 2008 - Dec 17, 2008; Houston, TX; United States
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  • 6
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    Effects of Different R ratios on Fatigue Crack Growth in Laser Peened Friction Stir Welds (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The influence of laser peening on the fatigue crack growth behavior of friction stir welded (FSW) Aluminum Alloy (AA) 7075-T7351 sheets was investigated. The surface modification resulting from the peening process on the fatigue crack growth of FSW was assessed for two different R ratios. The investigation indicated a significant decrease in fatigue crack growth rates resulting from using laser shock peening compared with unpeened, welded and unwelded specimens. The slower fatigue crack growth rate was attributed to the compressive residual stresses induced by the peening.
    Keywords: Metals and Metallic Materials
    Type: International Welding/Joining Conference 2007; May 10, 2007 - May 12, 2007; Seoul; Korea, Republic of
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  • 7
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    Laser Peening Effects on Friction Stir Welding (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The laser peening process can result in considerable improvement to crack initiation, propagation, and mechanical properties in FSW which equates to longer hardware service life Processed hardware safety is improved by producing higher failure tolerant hardware, and reducing risk. Lowering hardware maintenance cost produces longer hardware service life, and lower hardware down time. Application of this proposed technology will result in substantial benefits and savings throughout the life of the treated components
    Keywords: Metals and Metallic Materials
    Type: JSC-CN-18754 , 7th Symposium in Optics in Industry; Sep 09, 2009 - Sep 12, 2009; Guadalajara; Mexico
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