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Research Papers: Contact Mechanics

A Model of Contact With Adhesion of a Layered Elastic-Plastic Microsphere With a Rigid Flat Surface

[+] Author and Article Information
H. Eid, N. Joshi

 Department of Mechanical and Industrial Engineering Northeastern University, Boston, MA 02115

N. E. McGruer

 Department of Electrical and Computer Engineering Northeastern University, Boston, MA 02115

G. G. Adams1

 Department of Mechanical and Industrial Engineering Northeastern University, Boston, MA 02115adams@coe.neu.edu

1

Corresponding author.

J. Tribol 133(3), 031406 (Jul 25, 2011) (5 pages) doi:10.1115/1.4004343 History: Received January 19, 2011; Revised June 06, 2011; Published July 25, 2011; Online July 25, 2011

A finite element model of a layered hemisphere contacting a rigid flat, which includes the effect of adhesion, is developed. In this analysis elastic-plastic material properties were used for each of the materials comprising the layered hemisphere. The inclusion of the effect of adhesion, which was accomplished with the Lennard-Jones potential, required a special procedure. This configuration is of general theoretical interest in the understanding of adhesion. It has also been suggested as a possible design for a microswitch contact because, with an appropriate choice of metals, it has the potential to achieve low adhesion, low contact resistance, and high durability. The effect of the layer thickness on the adhesive contact was investigated. In particular the influences of layer thickness on the pull-off force, maximum contact radius, and contact resistance were determined. The results are presented as load versus interference and contact radius versus interference for loading and unloading from different values of the maximum interference.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Contact with adhesion between a layered hemisphere and rigid flat

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Figure 2

Axisymmetric FEM mesh of a layered microhemisphere

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Figure 3

Force versus contact displacement for 100 nm Ru on Au

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Figure 4

Contact radius versus contact displacement for 100 nm Ru on Au

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Figure 5

Force versus contact displacement for 50 nm Ru on Au

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Figure 6

Contact radius versus contact displacement for 50 nm Ru on Au

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Figure 7

Applied force versus contact displacement for 50 nm Ru on Au with different values of the work of adhesion

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Figure 8

Contact radius versus contact displacement for 50 nm Ru on Au with different values of the work of adhesion

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