Hydrodynamic friction in undistorted, concentrated point contacts is studied. Experimental measurements are obtained using a ball-and-plate machine, the plate being either flat, or with a circular groove. In the latter case, the ball drive-shaft is angled to vary the asymmetry of the contact. Reasonable correlation with experiment is obtained using a hydrodynamic theory which embraces the rolling, sliding and cavitation components of the total friction.
Get full access to this article
View all access options for this article.
References
1.
ThorpN.GoharR.‘Oil film thickness and shape for a ball sliding in a grooved raceway’, J. lubric. Technol., Trans. Asme197294 (No. 3), 199–210.
2.
CameronA.Principles of lubrication1966 (Longmans, London).
3.
KapitzaP. L.‘Hydrodynamic theory of lubrication during rolling’, Zh. tekh. Fiz.195525 (No. 4), 747–762.
4.
FlobergL.‘Cavitation in lubricating oil films’, Cavitation in real liquids (Edited by DaviesR.) 1964, 138–146 (Elsevier).
5.
ThorpN.Oil film thickness and friction in elliptical contacts Ph.D. Thesis, University of London, 1972.
6.
GoharR.‘Oil film thickness and rolling friction in elasto-hydrodynamic point contact’, J. lubric. Technol., Trans Asme197193 (No. 3), 371–382.
