期刊
CURRENT APPLIED PHYSICS
卷 14, 期 8, 页码 1116-1139出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2014.05.018
关键词
Ensemble of SWCNTs; Frequency analysis; Nonlocal discrete models; Nonlocal continuous models; Galerkin approach
资金
- Iranian National Science Foundation (INSF) [92032128]
Free dynamic analysis of transverse motion of vertically aligned stocky ensembles of single-walled carbon nanotubes is of particular interest. A linear model is developed to take into account the van der Waals forces between adjacent SWCNTs because of their bidirectional transverse displacements. Using Hamilton's principle, the discrete equations of motion of free vibration of the nanostructure are obtained based on the nonlocal Rayleigh, Timoshenko, and higher-order beam theories. The application of such discrete models for frequency analysis of highly populated ensembles would be associated with so much computational effort. To overcome such a problem, some useful nonlocal continuous models are established. The obtained results reveal that the newly developed models can successfully capture the predicted fundamental frequencies of the discrete models. Through various numerical studies, the roles of slenderness ratio, radius of the SWCNT, small-scale parameter, population of the ensemble, and intertube distance on the fundamental flexural frequency of the nanostructure are examined and discussed. The capabilities of the proposed nonlocal continuous models in predicting flexural frequencies of the nanostructure are also addressed. (C) 2014 Elsevier B.V. All rights reserved.
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