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TECHNICAL BRIEFS

Plastic Deterministic Contact of Rough Surfaces

[+] Author and Article Information
J. Jamari

Laboratory for Surface Technology and Tribology, Faculty of Engineering Technology, University of Twente, Drienerloolaan 5, Postbus 217, 7500 AE, Enschede, The Netherlandsj.jamari@ctw.utwente.nl

M. B. de Rooij, D. J. Schipper

Laboratory for Surface Technology and Tribology, Faculty of Engineering Technology, University of Twente, Drienerloolaan 5, Postbus 217, 7500 AE, Enschede, The Netherlands

J. Tribol 129(4), 957-962 (Apr 23, 2007) (6 pages) doi:10.1115/1.2768618 History: Received April 07, 2006; Revised April 23, 2007

In this paper, a theoretical and experimental investigation is presented to study the contact behavior of the plastic contact of deterministic rough surfaces. Analyses exclude bulk deformation of the rough surface and concentrate to the contact on asperity level. Surface asperities are modeled by an array of elliptic paraboloids where the unit event of a single contact is analyzed using an elastic-plastic elliptical contact model. A new method to determine the surface topography change due to plastic deformation is presented. Results show that the theoretical model developed predicts the contact area and the deformed geometry of the rough surface very well.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Asperity determination

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Figure 2

Asperity height determination

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Figure 3

Flow diagram for calculating the contact of rough surfaces

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Figure 4

Experimental setup

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Figure 5

Initial isotropic surface (a) and location (not size) of the corresponding contact asperities according to the volume conservation method (b)

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Figure 6

Contact area of isotropic surface: (a) model and (b) experiment

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Figure 7

3D difference image of a deformed isotropic surface: (a) model and (b) experiment

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Figure 8

Profile of the matched and stitched isotropic surface: (a)x profile at y=195μm and (b)y profile at x=171μm

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Figure 9

Anisotropic surface before contact is applied (a) and location (not size) of the corresponding asperities (b)

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Figure 10

Contact area of the anisotropic surface: (a) model and (b) experiment

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Figure 11

Profile of the matched and stitched anisotropic surface: (a)x profile at y=130μm and (b)y profile at x=126μm

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