By a News Reporter-Staff News Editor at Journal of Technology -- Researchers detail new data in Mechanical Science. According to news originating from Kashan, Iran, by VerticalNews correspondents, research stated, "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."
Our news journalists obtained a quote from the research from the University of Kashan, "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 Karman 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."
According to the news editors, the research concluded: "This study might be useful for the design and smart control of nano devices."
For more information on this research see: Nonlinear vibration and instability of fluid-conveying DWBNNT embedded in a visco-Pasternak medium using modified couple stress theory. Journal of Mechanical Science and Technology, 2013;27(9):2645-2658. Journal of Mechanical Science and Technology can be contacted at: Korean Soc Mechanical Engineers, Kstc New Bld. 7TH Floor, 635-4 Yeoksam-Dong Kangnam-Ku, Seoul 135-703, South Korea. (Springer - www.springer.com; Journal of Mechanical Science and Technology - www.springerlink.com/content/1738-494x/)
The news correspondents report that additional information may be obtained from A.G. Arani, Univ Kashan, Inst Nanosci & Nanotechnol, Kashan, Iran. Additional authors for this research include M.R. Bagheri, R. Kolahchi and Z.K. Maraghi.
Keywords for this news article include: Iran, Asia, Kashan, Mechanical Science
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