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Effect of Severe Shot Peening on the Very-High Cycle\nNotch Fatigue of an AW 7075 Alloy

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    0532360 - ÚFM 2021 RIV CH eng J - Journal Article
    Jambor, Michal - Trško, L. - Klusák, Jan - Fintová, Stanislava - Kajánek, D. - Nový, F. - Bokůvka, O.
    Effect of Severe Shot Peening on the Very-High Cycle
    Notch Fatigue of an AW 7075 Alloy.
    Metals. Roč. 10, č. 9 (2020), č. článku 1262. E-ISSN 2075-4701
    R&D Projects: GA MŠk(CZ) LQ1601
    Institutional support: RVO:68081723
    Keywords : ultrasonic fatigue testing * severe shot peening * notched fatigue * surface crack initiation * AW7075 aluminum alloy
    Subject RIV: JG - Metallurgy
    OECD category: Materials engineering
    Impact factor: 2.351, year: 2020
    Method of publishing: Open access
    https://www.mdpi.com/2075-4701/10/9/1262

    The severe shot peening process was applied to the notched specimens from an AW7075
    alloy with the aim to improve fatigue endurance in the very-high cycle fatigue region. To reveal the
    stress state in the notch vicinity, finite element analysis was performed, simulating the conditions
    of the used 20 kHz ultrasonic fatigue loading. Modified surface characteristics by the severe shot
    peening process were analyzed in terms of residual stress distribution measured by X-ray di raction
    methods and near-surface microstructural observations by scanning electron microscopy. The applied
    severe shot peening increased the fatigue limit by 11%, however, the positive e ect was recorded
    only for the loading amplitudes corresponding to the fatigue lifetimes in the range 107–109 cycles.
    At higher loading amplitudes, the fatigue properties tended to decrease, most likely due to accelerated
    fatigue crack initiation on the surface damage features created by the peening process and also by
    rapid residual stress relaxation.
    Permanent Link: http://hdl.handle.net/11104/0311447

     
     
Number of the records: 1