In the current study, the torsional vibration of carbon nanotubes is examined using the strain gradient theory and molecular dynamic simulations. The model developed based on this gradient theory enables us to interpret size effect through introducing material length scale parameters. The model accommodates the modified couple stress and classical models when two or all material length scale parameters are set to zero, respectively. Using Hamilton's principle, the governing equation and higher-order boundary conditions of carbon nanotubes are obtained. The generalized differential quadrature method is utilized to discretize the governing differential equation of the present model along with two boundary conditions. Then, molecular dynamic simulations are performed for a series of carbon nanotubes with different aspect ratios and boundary conditions, the results of which are matched with those of the present strain gradient model to extract the appropriate value of the length scale parameter. It is found that the present model with properly calibrated value of length scale parameter has a good capability to predict the torsional vibration behavior of carbon nanotubes.
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Rasht,
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October 2013
Research-Article
Torsional Vibration Analysis of Carbon Nanotubes Based on the Strain Gradient Theory and Molecular Dynamic Simulations
R. Ansari,
R. Ansari
1
e-mail: r_ansari@guilan.ac.ir
1Corresponding author.
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S. Ajori
University of Guilan,
Rasht,
S. Ajori
Department of Mechanical Engineering
,University of Guilan,
P.O. Box 3756
,Rasht,
Iran
Search for other works by this author on:
R. Ansari
e-mail: r_ansari@guilan.ac.ir
S. Ajori
Department of Mechanical Engineering
,University of Guilan,
P.O. Box 3756
,Rasht,
Iran
1Corresponding author.
Contributed by the Design Engineering Division of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received December 5, 2011; final manuscript received February 20, 2013; published online June 18, 2013. Assoc. Editor: Massimo Ruzzene.
J. Vib. Acoust. Oct 2013, 135(5): 051016 (6 pages)
Published Online: June 18, 2013
Article history
Received:
December 5, 2011
Revision Received:
February 20, 2013
Citation
Ansari, R., Gholami, R., and Ajori, S. (June 18, 2013). "Torsional Vibration Analysis of Carbon Nanotubes Based on the Strain Gradient Theory and Molecular Dynamic Simulations." ASME. J. Vib. Acoust. October 2013; 135(5): 051016. https://doi.org/10.1115/1.4024208
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