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Investigation of parameters affecting the limiting shear stress-pressure coefficient: a new model incorporating temperature
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-4785-7098
1994 (English)In: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 116, no 3, p. 612-620Article in journal (Refereed) Published
Abstract [en]

When calculating film thickness and friction in elastohydrodynamically lubricated contacts, assuming a non-Newtonian fluid, the lubricant limiting shear stress is an essential parameter. It influences minimum film thickness and determines traction in the contact. The limiting shear stress is pressure dependent according to the Johnson and Tevaarwerk equation: τL = τ0 + γp The limiting shear stress-pressure coefficient γ has in a previous screening investigation been shown to depend on several parameters: oil type, oil viscosity at +40°C, maximum contact pressure and temperature. In the present investigation, the preliminary data is used together with response surface methodology. With these results in mind, further experiments are made and an empirical model is built. This paper presents a new model for γ which is valid for two types of oil (a polyalphaolefine with diester and a naphthenic oil) with different viscosities at +40°C. The model incorporates the influence of maximum contact pressure and oil temperature on γ. The measurements on which the model is based were carried out at temperatures ranging from -20 to +110°C. The pressure range was 5.8-7 GPa and the shear rate was about 106 s-1.

Place, publisher, year, edition, pages
1994. Vol. 116, no 3, p. 612-620
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-3006DOI: 10.1115/1.2928889Scopus ID: 2-s2.0-0028461005Local ID: 0c096150-c25d-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-3006DiVA, id: diva2:975861
Note
Godkänd; 1994; 20070202 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Höglund, Erik

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