Surface Effect on Nonlinear Free Vibration Analysis of Nanotubes

Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

مقاله 5، دوره 3، شماره 2، آذر 2010، صفحه 39-46   

نوع مقاله: Persian

نویسندگان

Jafar Eskandari Jam¹؛ Yaser Mirzaei^{* 2}؛ Behnam Gheshlaghi³

¹Associated Professor, Composite Material and Technology Center, Tehran, Iran

²Professor, Department of mechanical engineering, Damavand branch, Islamic Azad University, Damavand, Iran

³- Lecturer, Department of mechanical engineering, Damavand branch, Islamic Azad University, Damavand, Iran

چکیده

In this work,The free nonlinear vibrations of nanotubes using the Euler-Bernoulli beam theory along with the von Kármán geometric nonlinearity in presence of surface effects has been investigated. Natural frequencies of a simply-supported nanotube in terms of the Jacobi elliptic functions are obtained by using the free vibration modes of the corresponding linear problem. The numerical results describe the imperative influence of surface effect, mode number, vibration amplitude, and the length and thickness of the nanotubes on the vibrational characteristics of the nanotubes. In addition the influence of surface effects on the system phase trajectory is considered. Finally, it is observed that the surface effects diminish by increasing in the dimension of nanotubes. The present study may be used to improve the design of  different types of micro-nano sensors.

کلیدواژه‌ها

Nonlinear vibration؛ Nanotubes؛ Surface effect

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