Advances in materials Research

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Bending and stability analysis of size-dependent compositionally graded Timoshenko nanobeams with porosities

  • Bensaid, Ismail (IS2M Laboratory, Faculty of Technology, Mechanical engineering Department, University of Tlemcen) ;
  • Guenanou, Ahmed (Faculty of Technology, Mechanical engineering Department, University of Tlemcen)
  • Received : 2017.02.03
  • Accepted : 2017.04.26
  • Published : 2017.03.25
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Abstract

In this article, static deflection and buckling of functionally graded (FG) nanoscale beams made of porous material are carried out based on the nonlocal Timoshenko beam model which captures the small scale influences. The exact position of neutral axis is fixed, to eliminate the stretching and bending coupling due to the unsymmetrical material change along the FG nanobeams thickness. The material properties of FG beam are graded through the thickness on the basis of the power-law form, which is modified to approximate the material properties with two models of porosity phases. By employing Hamilton's principle, the nonlocal governing equations of FG nanobeams are obtained and solved analytically for simply-supported boundary conditions via the Navier-type procedure. Numerical results for deflection and buckling of FG nanoscale beams are presented and validated with those existing in the literature. The influences of small scale parameter, power law index, porosity distribution and slenderness ratio on the static and stability responses of the FG nanobeams are all explored.

Keywords

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