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The influence of size-dependent shear deformation on mechanical behavior of microstructures-dependent beam based on modified couple stress theory

机译：基于修正耦合应力理论的尺寸相关剪切变形对微结构相关梁力学性能的影响

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In this investigation, a parametric study is performed to explore the influence of size-dependent shear deformation on static bending, buckling and free vibration behavior of microbeams based on modified couple stress classical and first shear deformation beam models. It is indicated that the influence of size-dependent shear deformation on mechanical behavior of the microbeams has an ascending trend with respect to dimensionless material length scale parameter. Moreover, the sensitivity of size-dependent shear deformation to dimensionless gyration radius and Poisson ratio has an ascending and a descending trend, respectively. The results show that the size-dependent shear deformation has the highest influence on the mechanical behavior of the microbeam with clamped clamped boundary conditions followed by clamped pined, pined pined and clamped free boundary conditions. As an application to micro electro mechanical systems (MEMS), the effect of size-dependent shear deformation on static pull-in voltage of an electrostatic microbridge is studied. (C) 2014 Elsevier Ltd. All rights reserved.
机译：在这项研究中，进行了参数研究，以基于改进的耦合应力经典和第一剪切变形梁模型，探索了尺寸相关的剪切变形对微梁的静态弯曲，屈曲和自由振动行为的影响。结果表明，相对于无量纲的材料长度尺度参数，尺寸相关的剪切变形对微梁力学性能的影响呈上升趋势。此外，与尺寸有关的剪切变形对无量纲回转半径和泊松比的敏感性分别具有上升和下降的趋势。结果表明，与尺寸有关的剪切变形对微束的力学行为影响最大，其中束缚的边界条件为紧随其后的，而束缚的销，钉销和自由边界条件都受到限制。作为微机电系统（MEMS）的一种应用，研究了尺寸相关的剪切变形对静电微桥的静态吸合电压的影响。 （C）2014 Elsevier Ltd.保留所有权利。

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