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    Volume 7, Issue 4 (June 2018)

    Special Issue Paper

    Residual Stress Field of a Single Edge Notch Specimen after Laser Shock Peening and Shot Peening Treatment

    (Received 19 August 2017; accepted 11 January 2018)

    Published Online: 12 June 2018

    CODEN: MPCACD

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    Abstract

    Laser shock peening (LSP) is a reliable, repeatable, and successful surface technique for introducing high magnitude, deep compressive residual stresses that can significantly increase the fatigue life of metallic components. However, depending upon how the LSP treatment is applied, the induced residual stresses can result in the undesirable deformation of the part. In this work, traditional shot peening has been applied over LSP as a means to optimize the stress distribution at the surface of a part while constraining deformation. A single edge notch test specimen of AA7075 was laser peened local to the notch region and then shot peened over the entire central region. The resulting residual stress distribution has been characterized using neutron diffraction to measure the stress distribution in the bulk, and it was compared with (1) incremental center hole drilling to measure the stress distribution up to depths of ∼1 mm and (2) near-surface stresses obtained in a previous X-ray diffraction (XRD) study on nominally identical specimens subjected to the same surface treatments. For regions where the two techniques overlap, the residual stresses are in good agreement (within uncertainty). Comparing the bulk stresses obtained from neutron diffraction in this study and XRD data published elsewhere, it can be shown that shot peening applied after LSP has a profound effect on near-surface stresses; however, these effects disappear at depths of ∼0.7 mm or more.

    Author Information:

    Coratella, Stefano
    Division of Aerospace Mechanics, University of Dayton Research Institute, Dayton, OH

    Spradlin, T. J.
    Air Force Research Laboratory, AFRL/RQVS, Fairborn, OH

    Langer, Kristina
    Air Force Research Laboratory, AFRL/RQVS, Fairborn, OH

    Gharghouri, Michael A.
    Canadian Nuclear Laboratories, Chalk River, Ontario

    Heckenberger, U. C.
    Airbus Defence and Space GmbH, Taufkirchen,

    Hombergsmeier, E.
    Airbus Defence and Space GmbH, Taufkirchen,


    Stock #: MPC20170133

    ISSN:2379-1365

    DOI: 10.1520/MPC20170133

    Author
    Title Residual Stress Field of a Single Edge Notch Specimen after Laser Shock Peening and Shot Peening Treatment
    Symposium ,
    Committee E07