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Rough surfaces
The pioneering work of Greenwood and Williamson on the contact of rough surfaces is a corner-stone of
tribology. The random process theory of rough surfaces has been developed further [1-3], to predict the
behaviour at the finite sampling interval used in practice. More recently, the implication of Archard's
concept of asperities on asperities has been recognised: the measurement of local maxima on a profile is
futile and attention is being directed to the measurement of prospective contact areas - which have
size-dependent characteristic geometries [4-6]. Other current work is on the measurement and use of the
spectral density of the surface roughness and its relation to fractal theory.
Relevant/recent publications
- Greenwood, J. A. 'A unified theory of surface roughness' Proc. Roy. Soc., A393, pp133-157
(1984).
- Greenwood, J. A. 'Contact of rough surfaces' in Fundamentals of Friction ed. Singer, I. L. and Pollock,
H. M., Kluwer Academic Publishers, Dordrecht (1992).
- Greenwood, J. A. 'Problems with surface roughness' in Fundamentals of Friction, (ed. Singer, I. L. and
Pollock, H. M.) Kluwer Academic Publishers, Dordrecht (1992).
- Greenwood, J. A. 'Contact of Rough Surfaces' Proc. 1st Royal Society-Indo UK Forum Solid-Solid
Interactions. Imperial College Press, London (1996).
- Greenwood, J. A. 'Contact Pressure Fluctuations' J. Engineering Tribology, 210, pp281-283
(1996).
- Greenwood, J. A. & Wu J.J. 'Surface Roughness and Contact: an Apology' 2000 AIMETA International
Tribology Conference, September 2000, L'Aquila, Italy.
Contact Details
For further information on the work summarised above contact Dr J A Greenwood at Cambridge University
Engineering Department, Trumpington St, Cambridge, CB2 1PZ, UK. Tel: 01223 332733, Fax: 01223 332662. E-mail:
jag@eng.cam.ac.uk |
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