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Structural Engineering and Mechanics Volume 70, Number 3, May10 2019, pages 351-365 DOI: http://dx.doi.org/10.12989/sem.2019.70.3.351 |
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Free vibration of Cooper-Naghdi micro saturated porous sandwich cylindrical shells with reinforced CNT face sheets under magneto-hydro-thermo-mechanical loadings |
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Raziye Yazdani, Mehdi Mohammadimehr and Borhan Rousta Navi
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| Abstract | ||
| In this paper, free vibration of Cooper-Naghdi micro sandwich cylindrical shell with saturated porous core and reinforced carbon nanotube (CNT) piezoelectric composite face sheets is investigated by using first order shear deformation theory (FSDT) and modified couple stress theory (MCST). The sandwich shell is subjected to magneto-thermo-mechanical loadings with temperature dependent material properties. Energy method and Hamilton\'s principle are used for deriving of the motion equations. The equations are solved by Navier\'s method. The results are compared with the obtained results by the other literatures. The effects of various parameters such as saturated porous distribution, geometry parameters, volume fraction and temperature change on the natural frequency of the micro-sandwich cylindrical shell are addressed. The obtained results reveal that the natural frequency of the micro sandwich cylindrical shell increases with increasing of the radius to thickness ratio, Skempton coefficient, the porosity of the core, and decreasing of the length to radius ratio and temperature change. | ||
| Key Words | ||
| Cooper-Naghdi micro sandwich cylindrical shell; carbon nanotube reinforced piezoelectric composite; first order shear deformation theory; modified couple stress theory; saturated porous distribution; free vibration | ||
| Address | ||
| Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan, P.O. Box:87317-53153, Kashan, Iran | ||