STP1419

    Application of a New Physically Based Model to Determine the Influence of Inclusion Population and Loading Conditions on the Distribution of Bearing Lives

    Published: Jan 2002


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    Abstract

    The principal cause of failure in bearings under E.H.D. conditions is deep spalling initiated beneath the surface. The corresponding damage mechanisms have been clearly identified (fatigue “butterflies,” crack nucleation and propagation to the surface). In this context, a statistical model, based on a mixed approach combining micromechanics and physical metallurgy, has been developed for predicting the distribution of bearing lives from the inclusion population in the steel. The model has been validated by comparing its predictions with experimental failure probability curves determined from flat washer fatigue tests performed on a steel whose inclusion distribution had been accurately established. The existence of non zero survival rates for very long lives indicates that Weibull distribution [1] is not suitable to represent the complete life distribution for modern bearings. The predictive capabilities of the model have been used to study the influence of parameters, such as the applied load, the specimen size, etc.

    Keywords:

    bearing steel, rolling contact, inclusion, crack nucleation, crack propagation, statistic, fatigue life


    Author Information:

    Lormand, G
    Assistant Professor, Doctor and Professor, Groupe d'Etude de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Piot, D
    Assistant Professor, Doctor and Professor, Groupe d'Etude de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Senior Engineer and Manager, CREAS ASCOMETAL, Amnéville,

    Vincent, A
    Assistant Professor, Doctor and Professor, Groupe d'Etude de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Baudry, G
    Senior Engineer and Manager, CREAS ASCOMETAL, Amnéville,

    Daguier, P
    Senior Engineer and Manager, CREAS ASCOMETAL, Amnéville,

    Girodin, D
    Senior Engineer and Manager, Analyse et Mesures, SNR Roulements, Annecy,

    Dudragne, G
    Senior Engineer and Manager, Analyse et Mesures, SNR Roulements, Annecy,


    Paper ID: STP10875S

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP10875S


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