STP1425: Evaluating Fatigue Life of Compressor Dovetails by Using Stress Singularity Parameters at the Contact Edge

    Yoshimura, T
    Senior researcher, Hitachi, Ltd., Ibaraki,

    Machida, T
    Chief researcher, Hitachi, Ltd., Ibaraki,

    Hattori, T
    Chief researcher, Hitachi, Ltd., Ibaraki,

    Pages: 11    Published: Jan 2003


    Abstract

    Fretting fatigue life of compressor dovetail for gas turbine was investigated using stress singularity theory. It is found that the crack initiation of fretting fatigue between blade dovetail and wheel dovetail occurs at the contact edge of blade dovetail. The parameters of stress singularity obtained from maximum principal stress distribution are capable to evaluate the fretting fatigue strength with the cyclic load having a constant angle against the contact surface under a variable contact pressure. The ratio of between the intensity range of stress singularity and the critical intensity range of stress singularity, Δ Hl/Δ Hc, is an effective parameter to predict the fretting fatigue life of compressor dovetail.

    Keywords:

    fretting fatigue, dovetail, stress singularity, critical intensity range of stress singularity


    Paper ID: STP10774S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP10774S


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