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What Part do Adhesion and Deformation Play in Fine-Scale Static and Sliding Contact?

Published online by Cambridge University Press:  28 February 2011

Q. Guo ,
J.D.J. Ross  and
H.M. Pollock
Q. Guo
Affiliation:
Department of Physics, University of Lancaster, Lancaster LA1 4YB, England
J.D.J. Ross
Affiliation:
Department of Physics, University of Lancaster, Lancaster LA1 4YB, England
H.M. Pollock
Affiliation:
Department of Physics, University of Lancaster, Lancaster LA1 4YB, England
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Abstract

We describe experiments involving the static or sliding contact of a 'single asperity' and a flat surface. Plastic deformation and possibly junction growth can occur even at zero applied load, as a consequence of surface forces. The conditions for this to occur, and the different modes of separation of an adhesive contact, are clarified with the help of 'maps': use of the macroscopic concepts involved, such as yield stress and work of adhesion, is sometimes questionable and evidence of the importance of nanometre-scale stepped topography is presented. Strong adhesion between hard non-metals can required thermal activation. Sliding contacts at the sub-micrometre level have shown behaviour ranging from 'unstable ploughing' to adhesive peeling, but the frictional mechanisms involved are often unclear.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 140: Symposium S – New Materials Approaches to Tribology: Theory and Applications , 1988 , 51
Copyright
Copyright © Materials Research Society 1989

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