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Research Papers: Contact Mechanics

Modeling of Asperity Collisions and Their Effects in a Frictionless Sliding Contact of Nominally Flat Metallic Surfaces

[+] Author and Article Information
L. Chang

Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802

J. Tribol 130(3), 031403 (Jun 23, 2008) (7 pages) doi:10.1115/1.2913543 History: Received August 31, 2007; Revised March 27, 2008; Published June 23, 2008

The collision process of a pair of asperities on two opposing surfaces is modeled in frictionless sliding motion with an analytically traceable approach. Equations of a sufficiently general representation are derived for the contact force, the load-carrying capacity, and the motion resistance of the asperity collision. A system model of the contact of two nominally flat metallic surfaces is subsequently developed incorporating the effects of asperity microcontact collisions. Results of a general nature are presented of the load capacity and motion resistance of the contact system in sliding motion. The model and the results may provide a first-order approximation of the effects of the asperity collisions in a sliding contact system.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the tangential collision of two spherical-tip asperities

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Figure 2

Asperity contact force through the collision process ((a) δ¯0=2 and (b) δ¯0=20)

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Figure 3

Reduction in the asperity load capacity as a function of the severity of the collision

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Figure 4

Coefficient of asperity-deformation-induced friction as a function of the severity of the collision

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Figure 5

Schematic of the equivalent contact system (the mean height of peaks is the reference plane with which the heights of asperities are defined)

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Figure 6

Reduction in the load capacity of the system from the prediction of the classical GW model

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Figure 7

Coefficient of deformation-induced friction of the system

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