Free vibrations of a sandwich cylindrical microshell with a porous core and carbon nanotube-reinforced facesheets

Teymouri, Hadi; Nouri, Ali; Hosseinian, Enayatollah

doi:10.22034/joae.2025.473944.1241

Free vibrations of a sandwich cylindrical microshell with a porous core and carbon nanotube-reinforced facesheets

Document Type : Original Article

Authors

Hadi Teymouri ¹

Ali Nouri ²

Enayatollah Hosseinian ²

¹ Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

² Faculty of Aerospace Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran

10.22034/joae.2025.473944.1241

Abstract

In this paper, the free vibration behavior of the sandwich cylindrical structure with a porous core composed of functionally graded materials, whose tips are reinforced with carbon nanotubes (CNT), is examined. The integration of a porous core with carbon nanotube-reinforced surfaces and a piezoelectric patch results in a distinctive composite material that enhances mechanical capabilities while minimizing weight; the free vibrations of these materials inside a cylindrical microshell have been examined for the first time in this paper. High-order shear and normal deformation theory (HSNDT), as well as modified couple stress theory (MCST), are employed in this investigation. The sandwich shell is subjected to a uniform electric field. Hamilton's principle is employed to derive the governing equations, which are then resolved using Navier's semi-analytical method. Comparisons are made with the existing answers for special cases to verify the veracity of the results we have obtained. The sandwich cylindrical natural frequency is examined in relation to a variety of parameters, including the effect of varying volumetric ratios, geometrical parameters, power index, and the porosity coefficient. One of the significant findings of this research is that the natural frequency increases as the percentage of nanotubes increases, which in turn makes the system stiffer. Similarly, the natural frequency of pure ceramics increases as the porosity coefficient increases.

Keywords

Cylindrical sandwich micro shell

Porous core

Carbon nanotubes

HSNDT theory

Subjects