Waviness Deformation in Starved EHL Circular Contacts
Author:
Venner C. H.1, Berger G.2, Lugt P. M.3
Affiliation:
1. University of Twente, Faculty of Mechanical Engineering, Department of Engineering Fluid Dynamics, P.O. Box 217, 7500 AE Enschede, The Netherlands 2. Laboratoire de Me´canique des Contacts, UMR CNRS 5514, INSA de Lyon, 20 Ave. A. Einstein, 69621, Villeurbanne Cedex, France 3. SKF Engineering & Research Centre, P.O. Box 2350, 3430 DT Nieuwegein, The Netherlands
Abstract
By means of numerical simulations the deformation of transverse and isotropic harmonic waviness in EHL circular contacts under pure rolling has been studied in relation to the lubricant supply to the contact. In earlier work the deformation of waviness under pure rolling in a fully flooded contact was shown to depend on a single non-dimensional wavelength parameter. In terms of this parameter short wavelengths deform very little. In this paper the effect of starvation on this behavior is shown. First, the steady state smooth surface problem is discussed as an introduction and as a reference problem. It is illustrated in detail how the entire film thickness level decreases with decreasing lubricant supply. Subsequently, results are presented for the time dependent problem with waviness moving through the contact under pure rolling. The relative deformed amplitude of the waviness inside the contact is shown to depend on the same non-dimensional wavelength parameter as before, but also on the degree of starvation. A smaller lubricant supply leads to a larger reduction of the waviness amplitude inside the contact. Finally, it is shown that to an acceptable accuracy the relative deformed amplitude of the starved problem can be predicted by the formula for the fully flooded problem if the generalized wavelength parameter is modified using the reduction factor of the central film thickness for the starved steady state smooth contact. For this reduction factor an accurate formula is available and as a result also for starved contacts by means of a component wise approach a crude estimate of the deformed surface micro-geometry (roughness) inside a contact can be obtained quite easily now.
Publisher
ASME International
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference36 articles.
1. Chiu, Y. P.
, 1974, “An Analysis and Prediction of Lubricant Film Starvation in Rolling Contact Systems,” ASLE Trans., 17(1), pp. 22–35. 2. Guangteng, G., Cann, P. M., and Spikes, H. A., 1992, “A Study of Parched Lubrication,” Wear, 153, pp. 91–105. 3. Chevalier, F., 1996, “Mode´lisation des Conditions d’Alimentation en Lubrifiant dans les Contacts Elastohydrodynamiques Ponctuels,” Ph.D. thesis, INSA de Lyon, France. 4. Cann, P. M., Lubrecht, A. A., and Venner, C. H., 2001, “Grease Lubrication of Rolling Element Bearings, A Model Future?,” Proceedings International Tribology Conference Nagasaki 2000, in press. 5. Wedeven, L. D., Evans, D., and Cameron, A., 1971, “Optical Analysis of Ball Bearing Starvation,” ASME J. Lubr. Technol., pp.349–363.
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