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    Instability Effects in Thermal Fatigue

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    This paper considers shape changes which develop progressively in hourglass specimens subjected to fully reversed cyclic plastic strain applied in a variety of mechanical and thermal waveforms. While the strain at the minimum diameter is controlled, off-center locations subjected to cyclic plastic strain undergo ratcheting. Two major off-center shape changes have been observed: barreling and necking. The paper discusses the reasons for these changes.


    thermal fatigue, strains, necking

    Author Information:

    Coffin, LF
    Mechanical engineer and Coolidge Fellow, Corporate Research and Development, General Electric Co., Schenectady, N.Y.

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP27894S