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An experimental study of the influence of heat storage and transportability of different lubricants on friction under transient elastohydrodynamic conditions
Option Matériaux, Ecole Centrale de Nantes.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
2003 (English)In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 217, no 1, p. 27-37Article in journal (Refereed) Published
Abstract [en]

Lubricated transient elastohydrodynamic (EHD) conjunctions are extremely difficult to simulate numerically since lubricant properties such as temperature and viscosity vary significantly during the loading-unloading event. Nevertheless, industry has invested considerable time and effort in trying to create such models in order to improve performance and to reduce emissions and friction. One of the essential requirements for a successful model is accuracy in the implementation of frictional properties. The experimental method presented in this paper used an impact on the end surface of a beam to generate propagating waves that were subjected to fast Fourier transform analysis. The method yielded detailed information about the build-up and decay of normal and frictional forces as a function of time for various lubricants at three different initial temperatures (20, 40 and 80 °C) and at relevant EHD pressures. A variety of lubricants were studied to a peak Hertzian pressure of 2.5 GPa for loading-unloading times of 200-400 µs (typical for elastohydrodynamically lubricated conjunctions in ball bearings and gears). A qualitative study of the thermal properties of the lubricants and their influence on viscosity and friction coefficient was also undertaken and, finally, a plausible explanation of the observed behaviour is presented and parallels to dynamic simulations of polyatomic gases are drawn.

Place, publisher, year, edition, pages
2003. Vol. 217, no 1, p. 27-37
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-6615DOI: 10.1243/135065003321164785ISI: 000181400200003Scopus ID: 2-s2.0-0037222211Local ID: 4dc421a0-d579-11db-8550-000ea68e967bOAI: oai:DiVA.org:ltu-6615DiVA, id: diva2:979501
Note
Validerad; 2003; 20070318 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Åhrström, Bert-OlofNorrby, Thomas

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