Estimation of Fatigue Life at Elevated Temperature of Electron Beam Weldments of Alloy 718

    Volume 14, Issue 1 (January 1986)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 6


    Fukakura, J
    Heavy Apparatus Engineering Laboratory, Toshiba Corporation, Yokohama,

    Mori, T
    Heavy Apparatus Engineering Laboratory, Toshiba Corporation, Yokohama,

    Abstract

    Axial displacement-controlled fatigue tests were conducted at 600°C on smooth solid cylindrical specimens of Alloy 718 with electron beam weldments. By monitoring the diametral strain response of the heat-softened region, relationships between strain amplitude and fatigue life, and between cyclic stress and strain, were obtained. Using the cyclic stress-strain curve of the soft region, the load-controlled fatigue test results corresponded to the axial displacement-controlled test results. Subsequently, a simple model of strain sharing in the weldment was established for cyclic loading in order to estimate the fatigue life. Using the model, the fatigue life of a welded specimen under axial loading was estimated as a function of gage length, considering the effect of gage length on strain concentration in the soft region.


    Paper ID: JTE10313J

    DOI: 10.1520/JTE10313J

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    Author
    Title Estimation of Fatigue Life at Elevated Temperature of Electron Beam Weldments of Alloy 718
    Symposium , 0000-00-00
    Committee E08