STP1122

    Thermo-Mechanical Fatigue Life Prediction Methods

    Published: Jan 1992


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    Abstract

    Synergistic effects of oxidation on high temperature isothermal and thermo-mechanical fatigue behavior are studied. Experiments were conducted under different strain-temperature variations and atmospheres to reveal the varying severities of oxide induced failure. Conditions conducive to intergranular creep damage under thermo-mechanical fatigue are identified, and the competing damage mechanisms are classified for steels, Ni-based superalloys, and Al alloys. Requirements and a solution procedure are outlined for a thermo-mechanical fatigue life prediction model which is then applied to 1070 steel, MarM-247 nickel-based superalloy, and A12xxx-T4 aluminum alloy.

    Keywords:

    thermo-mechanical fatigue, isothermal fatigue, oxidation, oxide cracking, creep, intergranular cracking, life prediction, damage, mechanical strain, thermal strain


    Author Information:

    Sehitoglu, H
    Director, University of Illinois at Urbana-ChampaignMechanics and Materials Program, National Science Foundation, UrbanaWashington, ILDC


    Paper ID: STP24152S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24152S


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