Comparison of non-Newtonian EHL models in high sliding applications.

Sharif, Khairi, Morris, S. J., Evans, Henry Peredur ORCID: https://orcid.org/0000-0002-6989-0190 and Snidle, Raymond Walter ORCID: https://orcid.org/0000-0001-9333-7195 2000. Comparison of non-Newtonian EHL models in high sliding applications. Presented at: 27th Leeds-Lyon Symposium on Tribology, Lyon, France, 5-8 September 2000. Published in: Dalmaz, G., Lubrecht, A. A., Dowson, D. and Priest, M. eds. Tribology Research: From Model Experiment to Industrial Problem A Century of Efforts in Mechanics, Materials Science and Physico-Chemistry.Proceedings of the 27th Leeds-Lyon Symposium on Tribology. Tribology Series Elsevier, pp. 787-796. 10.1016/S0167-8922(01)80159-0

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Abstract

The paper compares the results of different non-Newtonian EHL models applied to worm gear contact simulations. These are high sliding devices with slide-roll ratio close to 2 and shear rates of the order 107s−1 are imposed. Non-Newtonian and thermal effects are thus significant in determining the contact's lubricant film, friction and surface temperature characteristics. A non-Newtonian model incorporating Eyring shear thinning and limiting shear stress behaviour is considered. The model is formulated in the local sliding direction and results in a Reynolds type equation suitable for the general kinematic case, with cross-film temperature variation taken into account. Results are also presented for a longitudinally lubricated elliptical contact of principal radius ratio 4.6:1 and compared with experimental traction measurements obtained for the contact between a corresponding crowned roller and a glass disk in an EHL film thickness measurement rig. Numerically predicted traction curves are obtained using different non-Newtonian models and compared with the experimental curves. For each model the non-Newtonian parameters are chosen to match the traction curve at low sliding. Preliminary results suggest that the experimental traction curve is best predicted by an Eyring type numerical model.

Item Type:	Conference or Workshop Item - published (Paper)
Status:	Published
Schools:	Schools > Engineering
Publisher:	Elsevier
ISBN:	9780444505811
Last Modified:	02 Sep 2026 13:28
URI:	https://orca.cardiff.ac.uk/id/eprint/21295

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