Effect of displacement amplitude in oil-lubricated fretting

Fretting behaviour have been investigated in oil lubrication, covering a la rge range of amplitude from 2 to 400 mu m. Two types of oil and contact pai r on fretting behaviour were studied. A significant reduction in the coeffi cient of friction occurred above critical displacement amplitude. Analysis of fretting condition in combination with fretting mark examinations reveal that, at an early stage, fretting behaviour depended upon oil boundary lub rication, and was later closely associated with the degree of oxygen access and penetration of oil into the interface, Compared to dry conditions, a g reat difference in fretting regime behaviour and contact wear was observed. (C) 2000 Elsevier Science S.A. All rights reserved.