Internal Energy Transfer in Dynamical Behavior of Slightly Curved Shear Deformable Microplates

Ghayesh, Mergen H., Farokhi, Hamed and Alici, Gursel (2016) Internal Energy Transfer in Dynamical Behavior of Slightly Curved Shear Deformable Microplates. Journal of Computational and Nonlinear Dynamics, 11 (4). 041002. ISSN 1555-1415

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Official URL: http://dx.doi.org/10.1115/1.4031290

Abstract

This paper investigates the internal energy transfer and modal interactions in the dynamical behavior of slightly curved microplates. Employing the third-order shear deformation theory, the microplate model is developed taking into account geometric nonlinearities as well as the modified couple stress theory; the initial curvature is modeled by an initial imperfection in the out-of-plane direction. The in-plane displacements and inertia are retained, and the coupled out-of-plane, rotational, and in-plane motion characteristics are analyzed. Specifically, continuous models are developed for kinetic and potential energies as well as damping and external works; these are balanced and reduced via Lagrange's equations along with an assumed-mode technique. The reduced-order model is then solved numerically by means of a continuation technique; stability analysis is performed by means of the Floquet theory. The possibility of the occurrence of modal interactions and internal energy transfers is verified via a linear analysis on different natural frequencies of the system. The nonlinear resonant response of the system is obtained for the cases with internal energy transfer, and energy transfer mechanisms are analyzed; as we shall see, the presence of an initial curvature affects the system dynamics substantially. The importance of taking into account small-size effects is also shown by discovering this fact that both the linear and nonlinear internal energy transfer mechanisms are shifted substantially if this effect is ignored.

Item Type: Article
Uncontrolled Keywords: Resonance, Energy, Stress, Shear (Mechanics), Internal energy (Physics), Damping, Frequency response, Microplates, Displacement
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Paul Burns
Date Deposited: 23 Aug 2018 16:47
Last Modified: 23 Aug 2018 16:47
URI: http://nrl.northumbria.ac.uk/id/eprint/35464

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