A Comparison of Flattening and Indentation Approaches for Contact Mechanics Modeling of Single Asperity Contacts

[+] Author and Article Information
Robert L. Jackson1

Department of Mechanical Engineering, Auburn University, Auburn, AL 36849-5341

Lior Kogut2

Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, N6A 5B9, Canada


Corresponding author. Tel: (334)844-3340; Fax: (334)844-3307; e-mail: jacksr7@auburn.edu


Currently at QUALCOMM MEMS Technologies; e-mail: lkogut@qualcomm.com

J. Tribol 128(1), 209-212 (Aug 18, 2005) (4 pages) doi:10.1115/1.2114948 History: Received March 25, 2005; Revised August 18, 2005

This study compares the flattening and indentation approaches for modeling single asperity contacts in order to reveal quantitatively their different behaviors in terms of the constitutive relationships for the contact parameters and deformation regimes. The comparison is performed with four empirical models recently developed for flattening and indentation based on the finite element method. In the elasto-plastic regime, the classic Hertz solution does not hold and, therefore, different mechanical behavior was obtained for flattening and indentation cases. Consequently, the contact condition and relative strength of mating surfaces should be considered when choosing between indentation or flattening models.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Schematic illustration of (a) a deformable asperity (flattening) and (b) a rigid indenter (indentation) with pertinent nomenclature

Grahic Jump Location
Figure 2

Comparison of indentation and flattening models, with and without hardening effects

Grahic Jump Location
Figure 3

Comparison of normalized area as a function normalized load for indentation and flattening models



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