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Thermal point contact EHL analysis of rolling/sliding contacts with experimental comparison showing anomalous film shapes

Carli, Matteo, Sharif, Khairi, Ciulli, E., Evans, Henry Peredur and Snidle, Raymond Walter 2009. Thermal point contact EHL analysis of rolling/sliding contacts with experimental comparison showing anomalous film shapes. Tribology International 42 (4) , pp. 517-525. 10.1016/j.triboint.2008.07.011

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Abstract

The paper presents an experimental and numerical investigation of non-conformal lubricated contacts in which anomalous film shapes occur. The experiments were concerned with the contact between a steel ball and the plane surface of a glass disc at various slide-roll ratios. A paraffin base mineral oil was used as a lubricant and friction coefficients and film thicknesses were measured. It was found that for slide-roll ratios with the disk moving faster anomalous elastohydrodynamic lubrication (EHL) films were obtained characterized by a “dimple” in the central region of the contact. Numerical thermal–elastohydrodynamic analyses were carried out to simulate both film thickness and friction corresponding to the experimental conditions using Newtonian and Ree-Eyring rheological models. Initial results from this study suggest that neither of these lubricant models predict the correct detailed film shape and the experimental friction at the same time. An alternative lubricant model including both thermal and limiting shear stress effects (wall slippage) is currently under development.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Elastohydrodynamic lubrication; Anomalous film thickness; Friction coefficient; Thermal effects; Limiting shear stress
Publisher: Elsevier
ISSN: 1879-2464
Last Modified: 02 Jun 2019 22:58
URI: http://orca-mwe.cf.ac.uk/id/eprint/7675

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