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RESEARCH PAPERS

Experimental Investigation of Fully Plastic Contact of a Sphere Against a Hard Flat

[+] Author and Article Information
J. Jamari

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

D. J. Schipper

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

J. Tribol 128(2), 230-235 (Dec 12, 2005) (6 pages) doi:10.1115/1.2164470 History: Received June 16, 2005; Revised December 12, 2005

In this paper we report the experimental investigation to evaluate the published models for the contact of a deformable sphere against a hard flat in the fully plastic contact regime. A new measurement method has been used to measure the contact area. The behavior of the mean contact pressure and the contact area as a function of the contact load are presented. Substantial differences are found between the measurements and the model predictions. A constant value of the mean contact pressure as the load increases is observed, however, the value is lower than the hardness, as often reported. The contact area is found to be a simple truncation of the sphere by a hard flat.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Setup of the indentation of a sphere against a hard flat

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Figure 2

Matching and stitching procedure

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Figure 3

(a) Matching and stitching of five images for a 490N normal load. (b) A-A profile of (a).

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Figure 4

Plastic contact area versus interference. ∎ are experimental data

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Figure 5

Mean contact pressure against the nondimensional contact radius a∕R. ∎ are experimental data

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Figure 6

Mean contact pressure versus contact area. ∎ are experimental data

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Figure 7

Behavior of a hard sphere indenting a deformable half-space and a hard flat indenting a deformable sphere

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Figure 8

Contact area as a function of normal load. ∎ are experimental data

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Figure 9

Profile of the matching and stitching results for a 206N normal load of an aluminium sphere

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Figure 10

Plastic contact area versus interference of aluminium spheres. ● are experimental data

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Figure 11

Mean contact pressure versus contact area of aluminium spheres. ● are experimental data

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Figure 12

Contact area as a function of the normal load of aluminium spheres. ● are experimental data

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