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RESEARCH PAPERS

Elastic-Plastic Contact Behavior Considering Asperity Interactions for Surfaces With Various Height Distributions

[+] Author and Article Information
Yeau-Ren Jeng

Department of Mechanical Engineering, National Chung Cheng University, 168, University Rd., Ming-Hsiung, Chia-Yi, Taiwan 621imeyrj@ccu.edu.tw

Shin-Rung Peng

Department of Mechanical Engineering, National Chung Cheng University, 168, University Rd., Ming-Hsiung, Chia-Yi, Taiwan 621

J. Tribol 128(2), 245-251 (Oct 12, 2005) (7 pages) doi:10.1115/1.2162557 History: Received January 17, 2005; Revised October 12, 2005

This study investigates the effects of asperity interactions on the mean surface separation and the real contact area for rough surfaces with non-Gaussian height distributions. The effects of the asperity interactions on the local deformation behavior of a given microcontact are modeled using the Saint Venant principle and Love’s formula. The non-Gaussian rough surfaces are described by the Johnson translatory system. The results indicate that asperity interactions can significantly affect the mean separation of surfaces with non-Gaussian height distributions. The findings also reveal that the contact load and the real contact area of surfaces with non-Gaussian height distributions are significantly different from those of surfaces with Gaussian height distributions. This study uncovers that skewed surfaces tend to deform more elastically, which provides underlying physics for the long-time conventional wisdom and recent experimental data [Y. R. Jeng, 1996, Tribol. Trans., 39, 354–361;Y. R. Jeng, Z. W. Lin, and S. H. Shyo, 2004, ASME J. Tribol., 126, 620–625] that running-in surfaces have better wear resistance.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mean separation of surfaces as function of contact load for various skewness (ψ=0.7)

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Figure 2

Mean separation of surfaces as function of contact load for various kurtosis (ψ=0.7)

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Figure 3

Mean separation of surfaces as function of contact load for various skewness (ψ=2.5)

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Figure 4

Mean separation of surfaces as function of contact load for various kurtosis (ψ=2.5)

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Figure 5

Real area of contact of surfaces as function of contact load for various kurtosis (ψ=0.7)

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Figure 6

Real area of contact of surfaces as function of contact load for various kurtosis (ψ=2.5)

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Figure 7

Effects of non-Gaussian height distributions on critical contact load of surfaces with Ane∕At=0.02

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Figure 8

Effects of non-Gaussian height distributions on critical real area of contact of surfaces with Ane∕At=0.02

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