Advances in nano research

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Influence of porosity and axial preload on vibration behavior of rotating FG nanobeam

  • Ehyaei, Javad (Faculty of Engineering, Department of Mechanics, Imam Khomeini International University) ;
  • Akbarshahi, Amir (Faculty of Engineering, Department of Mechanics, Imam Khomeini International University) ;
  • Shafiei, Navvab (Department of Mechanical Engineering, Payame Noor University (PNU))
  • Received : 2016.10.18
  • Accepted : 2017.03.17
  • Published : 2017.06.25
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Abstract

In this paper, a nanobeam connected to a rotating molecular hub is considered. The vibration behavior of rotating functionally graded nanobeam based on Eringen's nonlocal theory and Euler-Bernoulli beam model is investigated. Furthermore, axial preload and porosity effect is studied. It is supposed that the material attributes of the functionally graded porous nanobeam, varies continuously in the thickness direction according to the power law model considering the even distribution of porosities. Porosity at the nanoscopic length scale can affect on the rotating functionally graded nanobeams dynamics. The equations of motion and the associated boundary conditions are derived through the Hamilton's principle and generalized differential quadrature method (GDQM) is utilized to solve the equations. In this paper, the influences of some parameters such as functionally graded power (FG-index), porosity parameter, axial preload, nonlocal parameter and angular velocity on natural frequencies of rotating nanobeams with pure ceramic, pure metal and functionally graded materials are examined and some comparisons about the influence of various parameters on the natural frequencies corresponding to the simply-simply, simplyclamped, clamped-clamped boundary conditions are carried out.

Keywords

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