Techno Press

Steel and Composite Structures   Volume 19, Number 3, September 2015, pages 713-733
Viscous fluid induced vibration and instability of FG-CNT-reinforced cylindrical shells integrated with piezoelectric layers
Mahmood Rabani Bidgoli, Mohammad Saeed Karimi and Ali Ghorbanpour Arani

Abstract     [Full Text]
    In this paper, viscous fluid induced nonlinear free vibration and instability analysis of a functionally graded carbon nanotube-reinforced composite (CNTRC) cylindrical shell integrated with two uniformly distributed piezoelectric layers on the top and bottom surfaces of the cylindrical shell are presented. Single-walled carbon nanotubes (SWCNTs) are selected as reinforcement and effective material properties of FG-CNTRC cylindrical shell are assumed to be graded through the thickness direction and are estimated through the rule of mixture. The elastic foundation is modeled by temperature-dependent orthotropic Pasternak medium. Considering coupling of mechanical and electrical fields, Mindlin shell theory and Hamilton\'s principle, the motion equations are derived. Nonlinear frequency and critical fluid velocity of sandwich structure are calculated based on differential quadrature method (DQM). The effects of different parameters such as distribution type of SWCNTs, volume fractions of SWCNTs, elastic medium and temperature gradient are discussed on the vibration and instability behavior of the sandwich structure. Results indicate that considering elastic foundation increases frequency and critical fluid velocity of system.
Key Words
    nonlinear vibration; viscous fluid; FG-CNTRC; piezoelectric layers; DQM
(1) Mahmood Rabani Bidgoli, Mohammad Saeed Karimi:
Faculty of Civil Engineering, Semnan University, Semnan, Iran;
(2) Mahmood Rabani Bidgoli, Mohammad Saeed Karimi:
Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran;
(3) Ali Ghorbanpour Arani:
Institute of Nanoscience & Nanotechnology,University of Kashan, Kashan, Iran.

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