Film thickness in a ball-on-disc contact lubricated with greases, bleed oils and base oils

• Type: Article in International Scientific Journal
• Date: 2012

Authors

cousseau, t (Author) Other; bjorling, m (Author) Other; graca, b (Author) Other; campos, a (Author) FEUP; seabra, j (Author) FEUP; larsson, r (Author) Other

Journal

Title: Tribology International

Vol. 53

Pages: 53-60

ISSN: 0301-679X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 33 Citations

Scopus - 47 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-002-6RM

DOI: 10.1016/j.triboint.2012.04.018

Abstract (EN): Three different lubricating greases and their bleed and base oils were compared in terms of film thickness in a ball-on-disc test rig through optical interferometry. The theoretical values calculated according to Hamrock's equation are in close agreement with the base oil film thickness measurements, which validates the selected experimental methodology. The grease and bleed oil film thickness under fully flooded lubrication conditions presented quite similar behaviour and levels. Therefore, the grease film thickness under full film conditions might be predicted using their bleed oil properties, namely the viscosity and pressure-viscosity coefficient. The base and bleed oil lubricant parameter LP are proportional to the measured film thickness. A relationship between grease and the corresponding bleed oil film thickness was evidenced.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8