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    Volume 44, Issue 4 (July 2016)

    Assessment of the Poisson Ratio Effect on Low Cycle Fatigue (LCF) Behavior of Shear-Cracking Mode Materials

    (Received 30 April 2014; accepted 13 January 2015)

    Published Online: 12 July 2016

    CODEN: JTEVAB

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    Abstract

    This paper evaluates the effect of different Poisson's ratios and an equivalent Poisson's ratio formula on the crack initiation angle and life estimation by using the three shear-strain based fatigue damage models (Brown–Miller, Fatemi–Socie, and Liu's Virtual Energy) on strain-controlled biaxial cyclic loading tests of specific tubular material specimens. The four shear failure mode materials studied were Inconel 718, 304L stainless steel, normalized 1050, and quenched/tempered 1050 steels. This study was motivated by the fact that for all the strain-controlled fatigue testing, the induced transverse strain was not measured, but assumed to be a negative product of the axial strain and the Poisson ratio, where the axial strain was known and given, and the Poisson ratio was either assumed to be a constant or a variable represented by a function of elastic and plastic equivalent strains. Therefore, the assumption of a Poisson's ratio in the transverse strain calculation was assessed in this study. It is concluded that the use of different Poisson's ratios in the three fatigue damage models would have some effects on the crack angle prediction, depending on the material type, and little effect on the fatigue life estimation for all materials investigated in this study.


    Author Information:

    Abed, Ghassan
    Department of Mechanical Engineering, Oakland Univ., Rochester, MI

    Lee, Yung-Li
    Chrysler Group LLC, Auburn Hills, MI

    Quigley, John
    General Dynamics Land Systems, Sterling Heights, MI

    Zhang, Wensheng
    Chrysler Group LLC, Auburn Hills, MI


    Stock #: JTE20140193

    ISSN:0090-3973

    DOI: 10.1520/JTE20140193

    Author
    Title Assessment of the Poisson Ratio Effect on Low Cycle Fatigue (LCF) Behavior of Shear-Cracking Mode Materials
    Symposium ,
    Committee E08