Influence of surface effect on wave behavior of flexural waves in carbon nanotubes

被引：0
作者：
Huang B. [1 ]
Wu J. [1 ]
Jin H. [2 ]
Zhou Q. [2 ]
机构：
[1] School of Civil Engineering and Mechanics, Xiangtan University, Xiangtan
[2] School of Physics and Optoelectronic Engineering, Xiangtan University, Xiangtan
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 08期
关键词：
Carbon nanotubes; Elastic medium; Generalized gradient elastic beam theory; Scale factor; Surface effect;
D O I：
10.11817/j.issn.1672-7207.2020.08.023
中图分类号：
学科分类号：
摘要：
Based on the theory of generalized gradient elastic beam, the influence of surface effect on the wave behavior of carbon nanotubes(CNTs) in free space and elastic medium was studied. CNTs were described by shear beam that considered both bending and shear deformation. The elastic medium was simulated with a two-parameter Pasternak-type elastic foundation. The governing equation of generalized gradient elastic shear beam considering the surface effect was established. The dispersion relation of bending wave in CNTs was derived, which was verified by the results of molecular dynamics simulation. The influence of surface effects, scale factors and elastic medium on the phase velocity of bending waves in CNTs was investigated. For multi-walled carbon nanotubes(MWCNTs), the dependence of wave velocity on van der Weals forces was studied, and the effects of MWCNTs layer number, surface effect, scale factor and elastic parameters on phase velocity of MWCNTs were discussed. The results show that the theoretical rusults obtained by the diperson reletion of bending wave in CNTs are agreement with those by molculer dynamies simulation, which incicates that the theoretical model can characterize the wave behavior of flexural waves in carbon nanotubes. © 2020, Central South University Press. All right reserved.
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页码：2289 / 2298
页数：9
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