Fundamental Mechanical Properties of Carbon Nanotubes: Current Understanding and the Related Experimental Studies

[+] Author and Article Information
Min-Feng Yu

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 W. Green Street, Urbana, IL 61801

J. Eng. Mater. Technol 126(3), 271-278 (Jun 29, 2004) (8 pages) doi:10.1115/1.1755245 History: Revised March 01, 2003; Received September 30, 2003; Online June 29, 2004
Copyright © 2004 by ASME
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The bending modulus of MWCNTs as a function of diameter. Data from 53.
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SEM images showing the MWCNT mounted between two opposing AFM tips. The squared region in (a) is shown in (b) acquired at a larger magnification in SEM. (c) Plot of the obtained stress versus strain curves for the measured MWCNTs. From 62.
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The stress versus strain curves obtained from the tensile loading experiments on individual SWCNT ropes. From 63.
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The evolutions of the “5-7-7-5” dislocation in CNT under tensile load. Either a brittle fracture or a plastic yield can occur for CNTs. In the plastic yield, the dislocations glide away along the helical path of the CNT, and result in a stepwise change of the diameter and the chirality of the tensile loaded CNT. From 72.
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SEM images showing (a) a MWCNT attached between two AFM tips, and (b) the same MWCNT after tensile loaded to break. Noticing the apparent difference between the total length of the MWCNT fragments in (b) and the initial gauge length in (a). From 64.
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TEM images showing (a) a suspended, fully collapsed and twisted MWCNT, and (b) a freestanding, fully collapsed and twisted MWCNT, on a lacy carbon TEM grid. From 95.
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(a) Consecutive AFM images in three-dimensional presentation showing the deformation of a MWCNT by adjusting the tapping force in tapping mode AFM. (b) Force-strain curves obtained for different sections of the MWCNT shown in (a) based on the height measurement in images acquired at different tapping force. The inset in (b) shows a proposed schematic of the structure of this MWCNT based on the deformability measurement. From 101.
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A schematic showing the forces involved in the interlayer sliding in MWCNT. The force can be described by Fa=Fs+Fi=πdτL(t)+Fi, where Fa is the applied pulling force, τ is the shear strength, L is the contact length, d is the shell diameter and Fi is the force originated from surface tension and edge effects, both of which are a function of diameter.
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The plots of applied force versus contact length obtained from the interlayer sliding measurement from two different MWCNTs. From 64.
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An SEM image showing the MWCNT rotational actuator, which consists of a center metal plate as a rotor, the suspended MWCNT as a shaft, and the two count electrodes and the substrate as the stator electrodes. From 110.




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