Effects of size-dependent elasticity on stability of nanotweezers  

作　　者：A.FARROKHABADI A.KOOCHI A.KAZEMI M.ABADYAN 

机构地区：[1]Department of Aerospace Engineering, Semnan University,Semnan 35131-19111, Iran [2]Mechanical Engineering Group, Shahrekord Branch, Islamic Azad University,Shahrekord 88137-33395, Iran [3]Department of Physics, University of Bath,Bath BA2-7AY, U.K.

出　　处：《Applied Mathematics and Mechanics(English Edition)》2014年第12期1573-1590,共18页应用数学和力学（英文版）

摘　　要：It is well-recognized that the electromechanical response of a nanostructure is affected by its element size. In the present article, the size dependent stability behavior and nanotweezers fabricated from nanowires are investigated by modified couple stress elasticity （MCSE）. The governing equation of the nanotweezers is obtained by taking into account the presence of Coulomb and intermolecular attractions. To solve the equation, four techniques, i.e., the modified variational iteration method （MVIM）, the monotonic iteration method （MIM）, the MAPLE numerical solver, and a lumped model, are used. The variations of the arm displacement of the tweezers versus direct current （DC） voltage are obtained. The instability parameters, i.e., pull-in voltage and deflection of the system, are computed. The results show that size-dependency will affect the stability of the nanotweezers significantly if the diameter of the nanowire is of the order of the length scale. The impact of intermolecular attraction on the size-dependent stability of the system is discussed.It is well-recognized that the electromechanical response of a nanostructure is affected by its element size. In the present article, the size dependent stability behavior and nanotweezers fabricated from nanowires are investigated by modified couple stress elasticity （MCSE）. The governing equation of the nanotweezers is obtained by taking into account the presence of Coulomb and intermolecular attractions. To solve the equation, four techniques, i.e., the modified variational iteration method （MVIM）, the monotonic iteration method （MIM）, the MAPLE numerical solver, and a lumped model, are used. The variations of the arm displacement of the tweezers versus direct current （DC） voltage are obtained. The instability parameters, i.e., pull-in voltage and deflection of the system, are computed. The results show that size-dependency will affect the stability of the nanotweezers significantly if the diameter of the nanowire is of the order of the length scale. The impact of intermolecular attraction on the size-dependent stability of the system is discussed.

关 键 词：nanotweezer NANOWIRE stability analysis modified couple stress elasticity（MCSE） intermolecular force 

分 类 号：TB383.1[一般工业技术—材料科学与工程]