Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 28, Issue 9, Pages 3749-3757Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-014-0836-5
Keywords
Pull-in instability; van der Waals (vdW) force; Modified couple stress theory (MCST); Nanocantilever; Nanobridge
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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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