SYMPOSIA PAPER Published: 01 January 2002
STP10875S

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

Source

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.

Author Information

Lormand, G
Groupe d'Etude de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne, France
Piot, D
Groupe d'Etude de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne, France CREAS ASCOMETAL, Amnéville, France
Vincent, A
Groupe d'Etude de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne, France
Baudry, G
CREAS ASCOMETAL, Amnéville, France
Daguier, P
CREAS ASCOMETAL, Amnéville, France
Girodin, D
Analyse et Mesures, SNR Roulements, Annecy, France
Dudragne, G
Analyse et Mesures, SNR Roulements, Annecy, France
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Details
Developed by Committee: A01
Pages: 493–508
DOI: 10.1520/STP10875S
ISBN-EB: 978-0-8031-5466-7
ISBN-13: 978-0-8031-2894-1