STP771

    Investigation of Optimum Crowning in a Line Contact Cylinder-to-Cylinder Rolling Contact Fatigue Test Rig

    Published: Jan 1982


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    Abstract

    The cylinder-to-cylinder rolling contact fatigue rig is a line contact type of accelerated test rig. As an example of the test results from this rig, an investigation of the influence of the full crowning value on the rolling contact fatigue life is described. In the contact stress distribution along the axis of the line contact, the contact stress at the crowning edge, Pedge, has a 1.4 times larger influence on the rolling contact fatigue life than the maximum contact stress, Pmax, at the center of the contact area; the rolling fatigue life is therefore determined by Pmax or 1.4 Pedge, whichever is larger. This result can also be interpreted by the contact stress at the edge, Qmax, calculated by Moyer's method. Then the rolling fatigue life is determined by Pmax or Qmax, whichever is larger. The optimum crowning value is the value which gives Pmax = 1.4 Pedge or Pmax = Qmax.

    Keywords:

    rolling contact fatigue, line contact, crowning value, edge loading, bearing steels


    Author Information:

    Sugiura, I
    Research engineer, chief engineer, senior research scientist, and managing director, NTN Toyo Bearing Co. Ltd., Kuwana,

    Ito, S
    Research engineer, chief engineer, senior research scientist, and managing director, NTN Toyo Bearing Co. Ltd., Kuwana,

    Tsushima, N
    Research engineer, chief engineer, senior research scientist, and managing director, NTN Toyo Bearing Co. Ltd., Kuwana,

    Muro, H
    Research engineer, chief engineer, senior research scientist, and managing director, NTN Toyo Bearing Co. Ltd., Kuwana,


    Paper ID: STP36137S

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP36137S


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