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Video recordings of an EHD point contact lubricated with grease
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-4785-7098
1991 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 24, no 3, p. 179-184Article in journal (Refereed) Published
Abstract [en]

Optical interferometry has been used to study the film thickness of an EHD point contact lubricated with grease. The greases used were two lithium, two lithium complex and two sodium greases, all with NLGI grade two, the most common grade. They were based on one mineral oil of naphthenic type and one synthetic polyalphaolefin. The contact was lubricated without a continuous supply of grease and thus the film thickness decreased with time as the grease was gradually squeezed away from the contact area. The film thickness fluctuated during the measurement. To overcome this problem, the contact point was recorded with a video camera and the results evaluated after the tests. The video camera proved to be a powerful help in this evaluation. The tests were run at 20°C and under pure rolling conditions at a rolling velocity of 0.055 m s-1. The results from all greases showed a decreasing film thickness that tended to stabilize on about 0.2 μm after 40 cycles. The lithium and lithium complex greases showed strong local film thickness variations inside the lubricated contact, deviating from the normally horseshoe-shaped contact, during the first 20 to 40 cycles.

Place, publisher, year, edition, pages
1991. Vol. 24, no 3, p. 179-184
National Category
Other Mechanical Engineering Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Computer Aided Design; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-3896DOI: 10.1016/0301-679X(91)90024-4ISI: A1991FV67800007Scopus ID: 2-s2.0-0026007429Local ID: 1be60960-7703-11dc-80da-000ea68e967bOAI: oai:DiVA.org:ltu-3896DiVA, id: diva2:976758
Note
Godkänd; 1991; 20071010 (kirhon)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Isaksson, OveHöglund, Erik

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Other Mechanical EngineeringTribology (Interacting Surfaces including Friction, Lubrication and Wear)

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