Nonlinear Vibration Analysis of Functionally Graded Carbon Nanotubes Sandwich Cylindrical Panels

  • Senaa S. Hafidh Mechanical Eng. Dept., University of Anbar
  • Hamad M. Hasan Mechanical Eng. Dept., University of Anbar
  • Farag M. Mohammed Electromechanical Eng.Dept., University of Technology, Iraq
Keywords: Sandwich Cylindrical Panels, Nonlinear Vibration, Functionally Graded Carbon Nanotube (FG-CNT), Imperfection Panel, First-Order Shear Deformation Theory

Abstract

In this research, we investigate the nonlinear vibration of functionally graded carbon nanotubes (FG-CNTs) for simply supported sandwich cylindrical panels. The sandwich consisting of three layers formed of (FG-CNTs) and isotropic material as (CNT, ALMINUME, CNT).  Mechanical properties of the sandwich media are acquired according to a refined rule of blend approach. The governing equations were derived using a first-order deformation theory (FOSDT). Four kinds of carbon nanotubes of sandwich cylindrical panels were analyzed. The volume fraction of CNTs is varied. The properties of nonlinear responses and free vibration are studied. The numerical approach employs the fourth-order Runge-Kutta and Galerkine procedure. Which conducted for the dynamic analysis of the panels to present the natural frequencies and non-linear dynamic response expression. The results show that; the natural frequencies and the nonlinear vibration amplitude decrease with the volume fraction and thickness ratio increase. The nonlinear vibration amplitude response increases when increasing the excitation force. The initial imperfection and the elastic foundation have a minor impact on the nonlinear vibration response of the panel. The Pasternak Foundation has a larger impact than the Winkler foundation. The structure formed of FG-CNT present an excellent choice for high-performance of engineering applications.

Author Biographies

Senaa S. Hafidh, Mechanical Eng. Dept., University of Anbar

 

 

Farag M. Mohammed, Electromechanical Eng.Dept., University of Technology, Iraq

  

Published
2020-09-18
How to Cite
Hafidh, S., Hasan, H., & Mohammed, F. (2020). Nonlinear Vibration Analysis of Functionally Graded Carbon Nanotubes Sandwich Cylindrical Panels. Al-Nahrain Journal for Engineering Sciences, 23(2), 127-136. https://doi.org/10.29194/NJES.23020127