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TECHNICAL PAPERS

Three-Dimensional Sliding Contact Analysis of Multilayered Solids With Rough Surfaces

[+] Author and Article Information
Shaobiao Cai

Nanotribology Laboratory for Information Storage and MEMS/NEMS (NLIM), 650 Ackerman Road, Suite 255, The Ohio State University, Columbus, OH 43202-1107

Bharat Bhushan1

Nanotribology Laboratory for Information Storage and MEMS/NEMS (NLIM), 650 Ackerman Road, Suite 255, The Ohio State University, Columbus, OH 43202-1107bhushan.2@osu.edu

1

Corresponding author.

J. Tribol 129(1), 40-59 (Aug 04, 2006) (20 pages) doi:10.1115/1.2401221 History: Received March 10, 2006; Revised August 04, 2006

Friction/stiction and wear are among the main issues in magnetic storage devices and microelectromechanical systems/nanoelectromechanical systems having contact interfaces. A numerical model which simulates the actual contact situations of those devices is needed to obtain optimum design parameters including materials with desired mechanical properties, layers thickness, and to predict and analyze the contact behavior of devices in operation. This study presents a first attempt to develop a numerical three-dimensional multilayered elastic–perfectly plastic rough solids model to investigate the contact behavior under combined normal loading and tangential traction. Energy method is used to formulate the problem, and variational principle in which the contact pressure distributions are those which minimize the total complementary potential energy is applied. A quasi-Newton method is used to find the minimum, and fast Fourier transform is applied to enhance the computation efficiency. In-depth analyses of the effects of friction force, layers properties, and layers thickness to contact statistics and stresses are performed. The optimum layer parameters which decrease friction/stiction and wear are investigated and identified.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Example of: (a) magnetic storage media; and (b) MEMS

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Figure 2

Schematics of: (a) 3D profiles of two rough surfaces in contact with one with two layers; and (b) top view of contact regions

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Figure 3

Surface height maps of a computer generated rough surface

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Figure 5

At different values of E1∕E3, E2∕E3, σ=1nm, β*=0.5μm, H3∕E3=0.05, pn∕E3=4×10−6, h1∕σ=h2∕σ=1, H1=H2=H3, E3=100GPa, variation of maximum stresses with coefficient of friction: (a) von Mises stress; (b) tensile stress; and (c) shear stress

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Figure 7

At different values of E1∕E3, E2∕E3, σ=1nm, β*=0.5μm, H3∕E3=0.05, pn∕E3=4×10−6, h1∕σ=h2∕σ=10, H1=H2=H3, E3=100GPa, variation of maximum stresses with coefficient of friction: (a) von Mises stress; (b) tensile stress; and (c) shear stress

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Figure 9

At different values of H1∕H3, H2∕H3, σ=1nm, β*=0.5μm, H3∕E3=0.05, pn∕E3=1×10−5, h1∕σ=h2∕σ=1, E1=E2=E3=100GPa, variation of maximum stresses with coefficient of friction: (a) von Mises stress; (b) tensile stress; and (c) shear stress

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Figure 11

At different values of H1∕H3, H2∕H3, σ=1nm, β*=0.5μm, H3∕E3=0.05, pn∕E3=1×10−5, h1∕σ=h2∕σ=10, E1=E2=E3=100GPa, variation of maximum stresses with coefficient of friction: (a) von Mises stress; (b) tensile stress; and (c) shear stress

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