Influence of Control Mode on Thermomechanical Fatigue Testing of Circumferentially-Notched Specimens

    (Received 9 September 2013; accepted 9 December 2013)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    The aim of this study is to understand the influence of experimentally applied boundary conditions on circumferentially-notched specimens under thermomechanical fatigue loadings (TMF) in two Ni-base superalloys, one equiaxed polycrystalline, and one directionally-solidified. TMF experiments were performed under both force-controlled and displacement-controlled conditions. Notch severities ranged from kt = 1.3 to kt = 2. The notch response was evaluated by finite element analysis using temperature-dependent viscoplasticity. The experiments and analyses are used to assess the impact of the applied boundary conditions on calculated and observed fatigue crack initiation lives.


    Author Information:

    Fernandez-Zelaia, P.
    The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Neu, R. W.
    The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA


    Stock #: MPC20130043

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130043

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    Author
    Title Influence of Control Mode on Thermomechanical Fatigue Testing of Circumferentially-Notched Specimens
    Symposium , 0000-00-00
    Committee E08