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Yaghoub Tadi Beni,Iman Karimipöur,Mohamadreza Abadyan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
Experimental observations reveal that the physical response of nanostructures is size-dependent. Herein, modified couple stress theoryhas 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 parametermodel have been employed to solve the governing equation of the systems. The pull-in parameters i.e. critical tip deflection andinstability voltage of the nanostructures have been determined. Effect of the van der Waals attraction and the size dependency and theimportance of coupling between them on the pull-in performance have been discussed.