Journal
TRIBOLOGY INTERNATIONAL
Volume 40, Issue 10-12, Pages 1413-1422Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2007.02.003
Keywords
contact mechanics; rough surfaces; self-affine fractals; elastic
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Funding
- National Research Foundation of Korea [2005-042-C00037] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The area and pressure distribution in elastic contacts between frictionless, nonadhesive surfaces is studied as a function of load and surface geometry using finite element calculations. Surfaces that follow self-affine scaling on all resolved scales are compared to Surfaces with cutoffs at small and large length scales, and experimental surfaces that are not self-affine. In all cases the true area of contact is proportional to load and inversely proportional to elastic modulus and the mean slope of the surface. The constant of proportionality kappa is nearly constant and lies between analytic predictions. Large wavelength cutoffs lead to a small increase in K, a homogeneous distribution of contacts at large scales, and limit the size of the largest connected regions. Small wavelength cutoffs lead to local redistributions in pressure that decrease the probability of low and high local pressures. (C) 2007 Elsevier Ltd. All rights reserved.
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