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Article

Applicability and Limitations of Simplified Elastic Shell Theories for Vibration Modelling of Double-Walled Carbon Nanotubes

1
Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, 42122 Reggio Emilia, Italy
2
Faculty of Mechanical Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel
3
Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL 33431, USA
4
Department of Engineering “Enzo Ferrari”, Centre InterMech Mo.Re., University of Modena and Reggio Emilia, 41125 Modena, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Gil Goncalves
Received: 2 July 2021 / Revised: 30 July 2021 / Accepted: 4 August 2021 / Published: 9 August 2021
The applicability and limitations of simplified models of thin elastic circular cylindrical shells for linear vibrations of double-walled carbon nanotubes (DWCNTs) are considered. The simplified models, which are based on the assumptions of membrane and moment approximate thin-shell theories, are compared with the extended Sanders–Koiter shell theory. Actual discrete DWCNTs are modelled by means of couples of concentric equivalent continuous thin, circular cylindrical shells. Van der Waals interaction forces between the layers are taken into account by adopting He’s model. Simply supported and free–free boundary conditions are applied. The Rayleigh–Ritz method is considered to obtain approximate natural frequencies and mode shapes. Different aspect and thickness ratios, and numbers of waves along longitudinal and circumferential directions, are analysed. In the cases of axisymmetric and beam-like modes, it is proven that membrane shell theory, differently from moment shell theory, provides results with excellent agreement with the extended Sanders–Koiter shell theory. On the other hand, in the case of shell-like modes, it is found that both membrane and moment shell theories provide results reporting acceptable agreement with the extended Sanders–Koiter shell theory only for very limited ranges of geometries and wavenumbers. Conversely, for shell-like modes it is found that a newly developed, simplified shell model, based on the combination of membrane and semi-moment theories, provides results in satisfactory agreement with the extended Sanders–Koiter shell theory in all ranges. View Full-Text
Keywords: carbon nanotubes; double-walled; linear vibrations; Sanders–Koiter theory; simplified shell models carbon nanotubes; double-walled; linear vibrations; Sanders–Koiter theory; simplified shell models
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MDPI and ACS Style

Strozzi, M.; Gendelman, O.V.; Elishakoff, I.E.; Pellicano, F. Applicability and Limitations of Simplified Elastic Shell Theories for Vibration Modelling of Double-Walled Carbon Nanotubes. C 2021, 7, 61. https://doi.org/10.3390/c7030061

AMA Style

Strozzi M, Gendelman OV, Elishakoff IE, Pellicano F. Applicability and Limitations of Simplified Elastic Shell Theories for Vibration Modelling of Double-Walled Carbon Nanotubes. C. 2021; 7(3):61. https://doi.org/10.3390/c7030061

Chicago/Turabian Style

Strozzi, Matteo, Oleg V. Gendelman, Isaac E. Elishakoff, and Francesco Pellicano. 2021. "Applicability and Limitations of Simplified Elastic Shell Theories for Vibration Modelling of Double-Walled Carbon Nanotubes" C 7, no. 3: 61. https://doi.org/10.3390/c7030061

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