Applied Mathematics and Mechanics (English Edition) ›› 2016, Vol. 37 ›› Issue (2): 265-274.doi: https://doi.org/10.1007/s10483-016-2030-8

• 论文 • 上一篇    

Size-dependent sinusoidal beam model for dynamic instability of single-walled carbon nanotubes

R. KOLAHCHI1, A. M. MONIRI BIDGOLI2   

  1. 1. Department of Civil Engineering, Islamic Azad University, Khomein 38815/17, Iran;
    2. College of Engineering, University of Tehran, Tehran 1417965463, Iran
  • 收稿日期:2015-04-28 修回日期:2015-08-14 出版日期:2016-02-01 发布日期:2016-02-01
  • 通讯作者: R. KOLAHCHI E-mail:r.kolahchi@gmail.com

Size-dependent sinusoidal beam model for dynamic instability of single-walled carbon nanotubes

R. KOLAHCHI1, A. M. MONIRI BIDGOLI2   

  1. 1. Department of Civil Engineering, Islamic Azad University, Khomein 38815/17, Iran;
    2. College of Engineering, University of Tehran, Tehran 1417965463, Iran
  • Received:2015-04-28 Revised:2015-08-14 Online:2016-02-01 Published:2016-02-01
  • Contact: R. KOLAHCHI E-mail:r.kolahchi@gmail.com

摘要:

In this study, a model for dynamic instability of embedded single-walled carbon nanotubes (SWCNTs) is presented. SWCNTs are modeled by the sinusoidal shear deformation beam theory (SSDBT). The modified couple stress theory (MCST) is considered in order to capture the size effects. The surrounding elastic medium is described by a visco-Pasternak foundation model, which accounts for normal, transverse shear, and damping loads. The motion equations are derived based on Hamilton's principle. The differential quadrature method (DQM) in conjunction with the Bolotin method is used in order to calculate the dynamic instability region (DIR) of SWCNTs. The effects of different parameters, such as nonlocal parameter, visco-Pasternak foundation, mode numbers, and geometrical parameters, are shown on the dynamic instability of SWCNTs. The results depict that increasing the nonlocal parameter shifts the DIR to right. The results presented in this paper would be helpful in design and manufacturing of nano-electromechanical system (NEMS) and micro-electro-mechanical system (MEMS).

关键词: dynamic instability, Bolotin method, sinusoidal shear deformation beam theory (SSDBT), modified couple stress theory (MCST), single-walled carbon nanotubes (SWCNTs)

Abstract:

In this study, a model for dynamic instability of embedded single-walled carbon nanotubes (SWCNTs) is presented. SWCNTs are modeled by the sinusoidal shear deformation beam theory (SSDBT). The modified couple stress theory (MCST) is considered in order to capture the size effects. The surrounding elastic medium is described by a visco-Pasternak foundation model, which accounts for normal, transverse shear, and damping loads. The motion equations are derived based on Hamilton's principle. The differential quadrature method (DQM) in conjunction with the Bolotin method is used in order to calculate the dynamic instability region (DIR) of SWCNTs. The effects of different parameters, such as nonlocal parameter, visco-Pasternak foundation, mode numbers, and geometrical parameters, are shown on the dynamic instability of SWCNTs. The results depict that increasing the nonlocal parameter shifts the DIR to right. The results presented in this paper would be helpful in design and manufacturing of nano-electromechanical system (NEMS) and micro-electro-mechanical system (MEMS).

Key words: single-walled carbon nanotubes (SWCNTs), Bolotin method, modified couple stress theory (MCST), sinusoidal shear deformation beam theory (SSDBT), dynamic instability

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