Vibration of a Nanocomposite Annular Sandwich Microplate Based on HSDT Using DQM

Mohsen Emdadi1, Mehdi Mohammadimehr1, Fatemeh Bargozini1
1Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

Tóm tắt

In this article, a numerical solution for free vibration of double-bonded composite annular sandwich microplate using modified couple stress and higher order shear deformation theories are presented. The structure is composed of carbon nanotube reinforced composite and a honeycomb aluminum core. Both of these two annular sandwich plates reinforced with carbon nanotubes are completely the same and there is no delamination between each other of layers. They are placed on each other by a Pasternak foundation. Constitutive equations in the elastic region and the kinematic equations are linear. Due to the complexity of the equations and the existence of non-linear equations, the numerical solution method is used. In addition, among partial equations, low-order methods need to increase the numbers of nodes (finite difference method) or elements (finite element method) and thus leads to enhance more computing volume and solution time to have higher accuracy. In this research, differential quadrature method (DQM) is used, in which, in this study, by a lower number of nodes on the structure domain, are more accurate than the previous methods and convert higher order complex equations into lower order simple equations. In this research, the scale of the investigated structures is micro, thus, the classical theories cannot be used. As a result, for predictions depending on the size of the analysed structure, non-classical higher order continuum theory, including modified couple stress theory (MCST) is employed. The Hamiltonian principle is used to derive the equations of motion and DQM is considered to solve them. The convergence of the solution method for examining the accuracy of the present work is shown and several comparison studies are investigated. In this research, the effects of inclined angle, geometric features of the core layer, aspect ratio of unit cell, volume fractions of carbon nanotubes, material length scale parameters and aspect ratio, side ratio, two elastic foundation parameters on dimensionless natural frequency for a micro annular sandwich plate is investigated. It is also concluded that changing the geometric parameters of the honeycomb core layer affects on the dimensionless frequency. The results of this research can be served for the design of materials science, as a benchmark data to validate other researcher method in micro-electro-mechanical systems, and nano-electro-mechanical systems.

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