Some problems in the tribology of rough surfaces

doi:10.1016/0301-679X(78)90001-4

Tribology International

Volume 11, Issue 3, June 1978, Pages 163-168

https://doi.org/10.1016/0301-679X(78)90001-4 Get rights and content

Abstract

Parameters such as slopes and curvatures are not intrinsic properties of a surface profile but depend on sampling techniques. Because of the non-stationarity of real surfaces, more fundamental parameters such as roughness and correlation length are also nonintrinsic. This leads to the concept of “functional filtering”, where the roughness used is that of a bandwidth of profile wavelengths defined by the practical problem in hand. Applications to tribological problems such as the contact of journal and roller bearings and the stiffness of machine tool joints are described and discussed. A typology of run-in surfaces based on a random-process characterization is proposed. Finally the application of discriminant analysis to problems not amenable to direct theoretical treatment is discussed and illustrated by an investigation of the failure of lip seals

References (23)

R.S. Sayles et al.
Thermal conductance of a rough elastic contact
Applied Energy
(1976)
A.W. Bush et al.
The elastic contact of a rough surface
Wear
(1975)
T.R. Thomas
Recent advances in the measurement and analysis of surface microgeometry
Wear
(1975)
B.B. Mikic
Thermal contact conductance: theoretical considerations
Int. J. Heat Mass Transfer
(1974)
R.S. Sayles et al.
The spatial representation of surface roughness by means of the structure function: a practical alternative to correlation
Wear
(1977)
T.R. Thomas et al.
Surface topography in engineering: a state-of-the-art review and bibliography
Brit. Hydromech. Res. Assn., Cranfield
(1977)
D.J. Whitehouse et al.
The properties of random surfaces of significance in their contact
P.R. Nayak
Random process model of rough surfaces
Trans. Am. Soc. Mech. Engrs.
(1971)
J.A. Greenwood et al.
Contact of nominally flat surfaces
Sayles R.S. and Thomas T.R. Measurements of the statistical microgeometry of engineering surfaces, Trans. Am. Soc....

R.S. Sayles et al.

Surface topography as a non-stationary random process

Nature

(1978)

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Some problems in the tribology of rough surfaces

Abstract

Applied Energy

Wear

Wear

Int. J. Heat Mass Transfer

Wear

Surface topography in engineering: a state-of-the-art review and bibliography

Brit. Hydromech. Res. Assn., Cranfield

The properties of random surfaces of significance in their contact

Random process model of rough surfaces

Trans. Am. Soc. Mech. Engrs.

Contact of nominally flat surfaces

Surface topography as a non-stationary random process

Nature