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Modeling the effect of intermolecular force on the size-dependent pull-in behavior of beam-type NEMS using modified couple stress theory

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Abstract

Experimental observations reveal that the physical response of nanostructures is size-dependent. Herein, modified couple stress theory has been used to study the effect of intermolecular van der Waals force on the size dependent pull-in of nanobridges and nanocantilevers. Three approaches including using differential transformation method, applying numerical method and developing a simple lumped parameter model have been employed to solve the governing equation of the systems. The pull-in parameters i.e. critical tip deflection and instability voltage of the nanostructures have been determined. Effect of the van der Waals attraction and the size dependency and the importance of coupling between them on the pull-in performance have been discussed.

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Authors and Affiliations

  1. Faculty of Engineering, Shahrekord University, Shahrekord, Iran

    Yaghoub Tadi Beni & Iman Karimipöur

  2. Shahrekord Branch, Islamic Azad University, Shahrekord, Iran

    Mohamadreza Abadyan

Authors
  1. Yaghoub Tadi Beni
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  2. Iman Karimipöur
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  3. Mohamadreza Abadyan
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Correspondence to Mohamadreza Abadyan.

Additional information

Recommended by Associate Editor Sungsoo Rhim

Mohamadreza Abadyan received his Ph.D. in aerospace engineering from Sharif University of Technology, in 2010. His current research interests are the NEMS pull-in and mechanical behavior of polymer/composites.

Yaghoub Tadi Beni received his Ph.D. in mechanical engineering from Sharif University of Technology in 2009. Now he is an assistant professor of mechanical engineer at Shahrekord University. His main research interest is computational mechanics.

Iman karimipour received the B.S. and M.S. degrees in mechanical engineering from Shahrekord University, Shahrekord, Iran and Yazd University, Yazd, Iran in 2011 and 2014, respectively. His major research interests are in general areas of Nano/Micro Electromechanical Systems and Nano Technology with particular reference to Computational Mechanics, Applied Mathematics.

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Beni, Y.T., Karimipöur, I. & Abadyan, M. Modeling the effect of intermolecular force on the size-dependent pull-in behavior of beam-type NEMS using modified couple stress theory. J Mech Sci Technol 28, 3749–3757 (2014). https://doi.org/10.1007/s12206-014-0836-5

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  • DOI: https://doi.org/10.1007/s12206-014-0836-5

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