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    STP853

    Biaxial/Torsional Fatigue of Turbine-Generator Rotor Steels

    Published: 0


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    Abstract

    This paper presents the results of a study to develop a methodology for predicting torsional fatigue damage to a turbine-generator rotor subjected to transient electrical disturbances. This methodology used torsional properties obtained from constant amplitude tests on 25.4-mm-diameter specimens. The predictions were verified with constant amplitude and variable amplitude tests of specimens up to 127 mm in diameter.

    The constant amplitude tests gave the following results:

    1. Fatigue reduction factors for notched specimens were readily estimated from Neuber's rule.

    2. Size effect could be approximated by lowering the strain-life curve by a function of the diameter ratio.

    3. Uniaxial and torsional fatigue properties and cyclic stress-strain properties correlated on octahedral shear stress and strain using a deformation theory of plasticity.

    Variable amplitude loading tests indicated that range pair cycle counting technique and linear damage rule predicted fatigue lives within a factor of two of actual test results. In addition, the predicted lives were generally conservative.

    Keywords:

    fatigue (materials), torsional fatigue, low cycle fatigue, high cycle fatigue, damage accumulation, notch fatigue


    Author Information:

    Williams, RA
    Engineer, manager of Rotor Design, and engineers, Steam Turbine-Generator Engineering and Manufacturing Department, General Electric Company, Schenectady, NY

    Placek, RJ
    Engineer, manager of Rotor Design, and engineers, Steam Turbine-Generator Engineering and Manufacturing Department, General Electric Company, Schenectady, NY

    Klufas, O
    Engineer, manager of Rotor Design, and engineers, Steam Turbine-Generator Engineering and Manufacturing Department, General Electric Company, Schenectady, NY

    Adams, SL
    Engineer, manager of Rotor Design, and engineers, Steam Turbine-Generator Engineering and Manufacturing Department, General Electric Company, Schenectady, NY

    Gonyea, DC
    Engineer, manager of Rotor Design, and engineers, Steam Turbine-Generator Engineering and Manufacturing Department, General Electric Company, Schenectady, NY


    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP36237S