Free vibration analysis of a piezoelectric curved sandwich nano-beam with FG-CNTRCs face-sheets based on various high-order shear deformation and nonlocal elasticity theories

چکیده مقاله

In this study, the free vibration responses of piezoelectric sandwich curved nano-beams resting on Winkler-Pasternak foundation are investigated based on the nonlocal elasticity theory and various higher-order shear deformation theories. The sandwich curved nano-beam includes a homogenous piezoelectric core and two face-sheets reinforced with functionally graded carbon nano-tubes (CNTs). Three various patterns of CNTs are employed in this analysis to distribute CNTs along to height of the nano-beam. The structure is subjected to a two-dimensional electric potential. In addition, different higher-order shear deformation beam theories (HOSDBTs), such as trigonometric shear deformation beam theory (TSDBT), exponential shear deformation beam theory (ESDBT), hyperbolic shear deformation beam theory (HSDBT), and Aydogdu shear deformation beam theory (ASDBT), are considered to extract the governing equations for different boundary conditions. The Hamilton principle is used to derive the governing equations of motion, based on various shear deformation theories. In order to analyse the vibration behaviors, the linear governing equations of motion are solved using the differential quadrature method (DQM). The comprehensive numerical results are presented to investigate the influence of important parameters, such as various shear deformation theories, nonlocal parameter, the volume fraction of the CNTs, various distributions of the CNTs, different boundary conditions, the external electric field and dimensionless geometric parameters, on the vibration characteristics of a piezoelectric curved sandwich nano-beam.