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  Volume 3, Number 1, February 2021 , pages 1-23
 open access

Free vibration analysis of sandwich structures reinforced by functionally graded carbon nanotubes
Alireza Pourmoayed, Keramat Malekzadeh Fard and Borhan Rousta

    In this research, the behavior of free vibrations of sandwich structure with viscoelastic piezoelectric composite face sheets reinforced by Functionally Graded Carbon Nanotubes (FG-CNTs) and simply supported boundary conditions using a new improved higher-order sandwich panel theory were investigated. The viscoelastic sandwich structure is rested on viscoelastic foundation. There are 33 freedom degree based on higher order plate theories for top, center and bottom of the sandwich plate. To calculate exact solution, all of the stress components were engaged. The governing equations and boundary conditions were derived via the Hamilton's principle and finally, these equations solved by Navier's method. The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions. The effect of different distributions of carbon nanotubes on non-dimensional natural frequency were inquired. Also, the effect of some important parameters such as those of length-to-thickness ratio and volume percentages of fibers, core thickness, elastic foundation, temperature and humidity changes, magnetic field, viscosity and voltage on free vibration response of sandwich structure were investigated.
Key Words
    free vibration; sandwich structures; carbon nanotubes; viscoelastic foundation; piezoelectric
Alireza Pourmoayed:
Department of Mechanical Engineering, University of Khatamul-Anbiya Air Defense, Tehran, Iran
Keramat Malekzadeh Fard:
Department of Aerospace Engineering, MalekAshtar University of Technology, Tehran, Iran
Borhan Rousta:
Institute of Aviation Industry, Tehran, Iran

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