Abstract
Nonlinear free vibration and instability of fluid-conveying double-walled boron nitride nanotubes (DWBNNTs) embedded in viscoelastic medium are studied in this paper. The effects of the transverse shear deformation and rotary inertia are considered by utilizing the Timoshenko beam theory. The size effect is applied by the modified couple stress theory and considering a material length scale parameter for beam model. The nonlinear effect is considered by the Von Kármán type geometric nonlinearity. The electromechanical coupling and charge equation are employed to consider the piezoelectric effect. The surrounding viscoelastic medium is described as the linear visco-Pasternak foundation model characterized by the spring and damper. Hamilton’s principle is used to derive the governing equations and boundary conditions. The differential quadrature method (DQM) is employed to discretize the nonlinear higher-order governing equations, which are then solved by a direct iterative method to obtain the nonlinear vibration frequency and critical fluid velocity of fluid-conveying DWBNNTs with clamped-clamped (C-C) boundary conditions. A detailed parametric study is conducted to elucidate the influences of the small scale coefficient, spring and damping constants of surrounding viscoelastic medium and fluid velocity on the nonlinear free vibration, instability and electric potential distribution of DWBNNTs. This study might be useful for the design and smart control of nano devices.
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Ali Ghorbanpour Arani received his B.Sc. degree from Sharif University of Technology, Tehran, Iran, in 1988. He then received his M.Sc. degree from Amirkabir University of Technology, Tehran, Iran, in 1991 and his Ph.D. degree from the Esfahan University of Technology, Esfahan, Iran, in 2001. Dr Ali Ghorbanpour Arani is a Professor in the Mechanical Engineering Department of University of Kashan, Kashan, Iran. His current research interests are stress analyses, stability and vibration of nanotubes and functionally graded materials. Mohammad Reza Bagheri received his B.Sc. degree from the University of Kashan in Kashan, Iran, in 2008. He then received his M.Sc. degree from University of Kashan in Kashan, Iran, in 2011.
Reza Kolahchi received his B.Sc. degree from the University of Islamic Kashan in Kashan, Iran, in 2009. He then received his M.Sc. degree from University of Kashan in Kashan, Iran, in 2011. He is currently a Ph.D. student at University of Kashan in Kashan, Iran. His research interests are nanomechanics, vibration, buckling and smart materials.
Zahra Khoddami Maraghi received her B.Sc. degree from the University of Kashan in kashan, Iran, in 2008. She then received her M.Sc. degree from University of Kashan in Kashan, Iran, in 2011. She is currently a Ph.D. student at University of Kashan in Kashan, Iran. Her research interests are nanomechanics, vibration, instability and smart materials.
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Ghorbanpour Arani, A., Bagheri, M.R., Kolahchi, R. et al. Nonlinear vibration and instability of fluid-conveying DWBNNT embedded in a visco-Pasternak medium using modified couple stress theory. J Mech Sci Technol 27, 2645–2658 (2013). https://doi.org/10.1007/s12206-013-0709-3
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DOI: https://doi.org/10.1007/s12206-013-0709-3