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research-article

An experimental and theoretical investigation of the mechanical behavior of multilayer initially curved microplates under electrostatic actuation

[+] Author and Article Information
Shahid Saghir

4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi ArabiaUniversity of Management and Technology (UMT), Daska Road, Sialkot, Pakistan
shahid.saghir@kaust.edu.sa

Saad Ilyas

4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
saad.ilyas@kaust.edu.sa

Nizar Jaber

4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
nizar.jaber@kaust.edu.sa

Mohammed Ibrahim Younis

4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
mohammad.younis@kaust.edu.sa

1Corresponding author.

ASME doi:10.1115/1.4036398 History: Received November 28, 2016; Revised March 14, 2017

Abstract

We investigate the static and dynamic behavior of a multilayer clamped-free-clamped-free (CFCF) microplate, which is made of polyimide, gold, chromium, and nickel. The microplate is slightly curved away from a stationary electrode and is electrostatically actuated. The free and forced vibrations of the microplate are examined. First, we experimentally investigate the variation of the first natural frequency under the electrostatic DC load. Then, the forced dynamic behavior is investigated by applying a harmonic AC voltage superimposed to a DC voltage. Results are shown demonstrating the transition of the dynamic response of the microplate from hardening to softening as the DC voltage is changed as well the dynamic pull-in phenomenon. For theoretical model, we adopt a dynamic analog of the von-Karman governing equations accounting for initial curvature imperfection. These equations are then used to develop a reduced order model based on the Galerkin procedure to simulate the mechanical behavior of the microplate. We compare the theoretical results with experimental data and show excellent agreement among the results. We also examine the effect of the initial rise on the natural frequencies of first three symmetric-symmetric modes of the plate.

Copyright (c) 2017 by ASME
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