NDLI: On the Increase in Boundary Friction with Sliding Speed

Content Provider	Springer Nature Link
Author	Campen, Sophie Green, Jonathan Lamb, Gordon Atkinson, David Spikes, Hugh
Copyright Year	2012
Abstract	During the last sixty years there have been consistent reports in the literature that in the boundary lubrication regime, some, but not all, solutions of organic friction modifiers give extremely low friction at very low sliding speed, that then increases linearly with the logarithm of sliding speed. This article first reviews some previous studies that show this phenomenon and describes the main mechanisms proposed to explain it. New friction-sliding speed data are then presented, which show that an increase in friction with sliding speed occurs with saturated alkyl chain organic friction modifiers but not with unsaturated chain, oleyl-based ones, at the concentrations studied. It is, however, shown that elaidic acid, the trans-isomer of oleic acid gives friction that increases with sliding speed. A key difference between these two compounds is that the cis arrangement of carbon–carbon bonds around the double bond of oleic acid means that the molecule cannot easily adopt a linear configuration, while elaidic acid can. This suggests that the ability of an organic friction modifier to produce friction that increases with sliding speed originates from its ability to form close-packed layers on steel surfaces. Importantly, even though oleyl derivatives do not show friction that increases with sliding speed, they still reduce friction quite significantly over the sliding speed range studied, although to a lesser extent than their saturated analogues, especially at low sliding speeds.
Starting Page	237
Ending Page	248
Page Count	12
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	48
Issue Number	2
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2012-08-04
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Friction Modifiers Boundary Lubrication Friction Friction Mechanisms Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Tribology, Corrosion and Coatings Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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