Influence of Rotation on Vibration Behavior of a Functionally Graded Moderately Thick Cylindrical Nanoshell Considering Initial Hoop Tension

Subject Areas : Engineering

H Safarpour ¹ , M.M Barooti ² , M Ghadiri ³

1 - Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran
2 - Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran
3 - Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran

Received: 2019-01-23 Accepted : 2019-03-25 Published : 2019-06-30

Keywords: Functionally graded material, Modified couple stress theory, Critical speed, GDQM, Initial hoop tension, Moderately thick cylindrical nanoshell,

Abstract :

In this research, the effect of rotation on the free vibration is investigated for the size-dependent cylindrical functionally graded (FG) nanoshell by means of the modified couple stress theory (MCST). MCST is applied to make the design and the analysis of nano actuators and nano sensors more reliable. Here the equations of motion and boundary conditions are derived using minimum potential energy principle and first-order shear deformation theory (FSDT). The formulation consists of the Coriolis, centrifugal and initial hoop tension effects due to the rotation. The accuracy of the presented model is verified with literatures. The novelty of this study is the consideration of the rotation effects along with the satisfaction of various boundary conditions. Generalized differential quadrature method (GDQM) is employed to discretize the equations of motion. Then the investigation has been made into the influence of some factors such as the material length scale parameter, angular velocity, length to radius ratio, FG power index and boundary conditions on the critical speed and natural frequency of the rotating cylindrical FG nanoshell.

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