@article { author = {Zarezadeh, Esmail and Shirpay, Ali}, title = {Pull-in behaviors of micro-beam made of bidirectional functionally grade materials based on modified couple stress theory}, journal = {Journal of Computational Applied Mechanics}, volume = {51}, number = {2}, pages = {472-481}, year = {2020}, publisher = {University of Tehran}, issn = {2423-6713}, eissn = {2423-6705}, doi = {10.22059/jcamech.2020.313559.570}, abstract = {In this paper, pull-in behavior of cantilever micro/nano beams made of bi directional functionally graded materials (BDFGM) with small scale effects under electrostatic force is investigated. Couple stress theory is employed to study the influence of small-scale on pull-in behavior. The material properties except Poisson’s ratio obey the arbitrary function in the thickness and length direction. The approximate analytical solutions for the pull-in voltage and pull-in displacement of the microbeams are derived using the Galerkin method. Comparison between the results of present work with other article for pull-in behavior of a microbeams made of isotropic material reveals the accuracy of this study. Numerical results explored the effects of material length scale parameter, inhomogeneity constant, gap distance and dimensionless thickness.}, keywords = {pull-in,couple stress,Bi directional functionally graded materials,Size effect,Galerkin}, url = {https://jcamech.ut.ac.ir/article_78641.html}, eprint = {https://jcamech.ut.ac.ir/article_78641_0346b968d32523ced5fbfcd1dd7399a4.pdf} }