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Investigation of the mechanical behavior of functionally graded sandwich thick beams

  • Mouaici, Fethi (Department of Civil Engineering, Faculty of Technology, University of Blida1) ;
  • Bouadi, Abed (Department of Physics, University of Science and Technology of Oran (USTO)) ;
  • Bendaida, Mohamed (Laboratoire de Modelisation et Simulation Multi-Echelle, Universite de Sidi Bel Abbes) ;
  • Draiche, Kada (Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department) ;
  • Bousahla, Abdelmoumen Anis (Laboratoire de Modelisation et Simulation Multi-Echelle, Universite de Sidi Bel Abbes) ;
  • Bourada, Fouad (Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department) ;
  • Tounsi, Abdelouahed (Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department) ;
  • Ghazwani, Mofareh Hassan (Department of Mechanical Engineering, Faculty of Engineering, Jazan University) ;
  • Alnujaie, Ali (Department of Mechanical Engineering, Faculty of Engineering, Jazan University)
  • Received : 2019.03.28
  • Accepted : 2022.09.05
  • Published : 2022.09.10
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Abstract

In this paper, an accurate kinematic model has been developed to study the mechanical response of functionally graded (FG) sandwich beams, mainly covering the bending, buckling and free vibration problems. The studied structure with homogeneous hardcore and softcore is considered to be simply supported in the edges. The present model uses a new refined shear deformation beam theory (RSDBT) in which the displacement field is improved over the other existing high-order shear deformation beam theories (HSDBTs). The present model provides good accuracy and considers a nonlinear transverse shear deformation shape function, since it is constructed with only two unknown variables as the Euler-Bernoulli beam theory but complies with the shear stress-free boundary conditions on the upper and lower surfaces of the beam without employing shear correction factors. The sandwich beams are composed of two FG skins and a homogeneous core wherein the material properties of the skins are assumed to vary gradually and continuously in the thickness direction according to the power-law distribution of volume fraction of the constituents. The governing equations are drawn by implementing Hamilton's principle and solved by means of the Navier's technique. Numerical computations in the non-dimensional terms of transverse displacement, stresses, critical buckling load and natural frequencies obtained by using the proposed model are compared with those predicted by other beam theories to confirm the performance of the proposed theory and to verify the accuracy of the kinematic model.

Keywords

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