STP520

    Ratchetting Under Cyclic Axial Strain with Torsional Stress

    Published: Jan 1973


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    Abstract

    In order to investigate the fundamental behavior of thermal stress ratchetting, strain controlled push-pull low-cycle fatigue tests with steady torsional stress were conducted on ASTM A302-B steel, AISI 304 steel, and JIS SCM 3 steel under constant elevated and cyclic temperatures. The test results are summarized as follows: (1) Torsional ratchet deformation gradually increased as a permanent deformation fluctuating as axial strain changed. The amplitude of the fluctuation depends on cyclic axial strain, but permanent deformation depends on steady stress as well as cyclic axial strain. (2) Ratchet strain increased at a nearly constant rate for each cycle of axial strain. The rate of increase is proportional to steady torsional stress and exponentially proportional to the axial strain amplitude. (3) The torsional stress and deformation caused by the tests do not influence low cycle fatigue or thermal-fatigue strength.

    Keywords:

    fatigue (materials), axial strain, shear stress, strain tests, thermal fatigue, low alloy steels, stainless steels, temperature, plastic deformation


    Author Information:

    Yamanouchi, H
    Manager, Strength Research Laboratory, and research assistant, First Experimental Laboratory, Nagasaki Technical Institute, Mitsubishi Heavy Industries, Ltd., Nagaski,

    Asada, Y
    Assistant professor, University of Tokyo, with Nagaski Technical Institute, Mitsubishi Heavy Industries, Ltd.,

    Wakamatsu, Y
    Manager, Strength Research Laboratory, and research assistant, First Experimental Laboratory, Nagasaki Technical Institute, Mitsubishi Heavy Industries, Ltd., Nagaski,


    Paper ID: STP38870S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38870S


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