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Investigation of a Spectral-Based Surface Contact Model via Pointwise Computations

[+] Author Affiliations
Jeffrey L. Streator

Georgia Institute of Technology, Atlanta, GA

Paper No. IMECE2009-11617, pp. 33-38; 6 pages
doi:10.1115/IMECE2009-11617
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 12: Micro and Nano Systems, Parts A and B
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4385-7 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

One of the outstanding issues in the analysis of contacting surfaces regards properly accounting for the multi-scale nature of the surface topography. Many treatments of surface contact, particularly those that derive from the well known Greenwood Williamson (GW) model, proceed from the basis that one can determine a representative curvature of the surface peaks (or summits) by means of computing the appropriate numerical derivative of the sampled profile data. However, as has been demonstrated over the last 20 years or so, numerical derivatives of surface data are sensitive to the lateral spacing between sampled surface points. In view of the potential ambiguity associated with such a determination of peak curvature, a number of models have been put forth that account for the fact that topographical features exist at many scales of observation. In the present work, predictions of a recently developed spectral-based model of elastic (rough) surface contact are compared to those of a deterministic numerical computation in which the equations of elasticity are solved at every nodal point of a 3D surface.

Copyright © 2009 by ASME
Topics: Computation

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