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SPECIAL SECTION ON NANOMATERIALS AND NANOMECHANICS

Abnormal Tribological Behavior of Multiwalled Nanotube Rafts Part I: Aligned Rafts

[+] Author and Article Information
Wei Yang, Hongtao Wang

 Department of Engineering Mechanics, Tsinghua University, Beijing 100084, Chinayw-dem@tsinghua.edu.cn

Y. Huang

 Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, IL 61801

J. Eng. Mater. Technol 127(4), 383-392 (Nov 15, 2004) (10 pages) doi:10.1115/1.1867980 History: Received May 22, 2004; Revised November 15, 2004

When two material surfaces are brought into contact, the classical Amonton’s law predicts a monotonically increasing relation between the frictional force and the normal pressure. An abnormal friction law refers to the case where the friction force declines as the normal pressure increases. We investigate the possibility of abnormal tribological behavior for two surfaces coated with aligned multiwalled nanotube rafts. Part I of the investigation is devoted to the case when two contacting nanotube rafts are aligned to each other, while part II is aimed at more general case of arbitrarily oriented nanotube rafts. The analysis in part I is based on the JKR theory of adhesion and linear elasticity for aligned multiwalled carbon nanotube raft configuration. It gives rise of several interesting predictions. First, two surfaces covered by aligned nanotubes can adhere when bringing into a pressureless contact. Second, the aligned multiwalled nanotube rafts exhibit a detachment work that declines with the contacting pressure. Third, in contrast to the Amonton’s law, the frictional force would decline as the normal pressure increases.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 6

Curves between the frictional force F‖A–A and the normal pressure p0. (a) E=4GPa and for γ̂=0.00001, 0.0001, and 0.001; (b) γ̂=0.0001 and for E=1GPa, 4GPa, and 36GPa.

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Figure 7

Curve between the frictional force F‖A–V and the normal p0 for φ values of π∕3. (a) E=4GPa and for γ̂=0.00001, 0.0001, and 0.001; (b) γ̂=0.0001 and for E=1GPa, 4GPa, and 36GPa.

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Figure 9

Curve between the frictional force F⊥A–V and the normal p0 for φ values of π∕3. (a) E′=4GPa and for γ̂=0.00001, 0.0001, and 0.001; (b) γ̂=0.0001 and for E′=1GPa, 4GPa, and 36GPa.

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Figure 8

The crawling mechanism for transverse slip

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Figure 1

Aligned MWCNT rafts in contact, undeformed configurations; (a) asperity–asperity contact, (b) asperity–valley contact

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Figure 2

Schematics for off-line displacement calculation

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Figure 3

Curve between dimensionless quantity δ̂off and the angle θ

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Figure 4

Schematics for on-line displacement calculation

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Figure 5

Numerical exploration for the relation between the on-line displacement δon, the contact radius a, and the load P, ν′=0.3. Graphs (a) and (b) correlate the center shift caused by the first and the second terms of Eq. 29

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