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A refined quasi-3D hybrid-type higher order shear deformation theory for bending and Free vibration analysis of advanced composites beams

  • Meradjah, Mustapha (Laboratoire des Structures et Materiaux Avances dans le Genie Civil et Travaux Publics, Departement de genie Civil, Universite de Sidi Bel Abbes, Faculte de Technologie) ;
  • Bouakkaz, Khaled (Departement de Genie Civil, Universite Ibn Khaldoun) ;
  • Zaoui, Fatima Zohra (Laboratory of numerical and experimental modeling of the mechanical phenomena, Department of Mechanical Engineering, Faculty of sciences and Technology, Ibn Badis University) ;
  • Tounsi, Abdelouahed (Laboratoire des Structures et Materiaux Avances dans le Genie Civil et Travaux Publics, Departement de genie Civil, Universite de Sidi Bel Abbes, Faculte de Technologie)
  • Received : 2017.11.27
  • Accepted : 2018.04.05
  • Published : 2018.10.25
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Abstract

In this paper, a new displacement field based on quasi-3D hybrid-type higher order shear deformation theory is developed to analyze the static and dynamic response of exponential (E), power-law (P) and sigmoïd (S) functionally graded beams. Novelty of this theory is that involve just three unknowns with including stretching effect, as opposed to four or even greater numbers in other shear and normal deformation theories. It also accounts for a parabolic distribution of the transverse shear stresses across the thickness, and satisfies the zero traction boundary conditions at beams surfaces without introducing a shear correction factor. The beam governing equations and boundary conditions are determined by employing the Hamilton's principle. Navier-type analytical solutions of bending and free vibration analysis are provided for simply supported beams subjected to uniform distribution loads. The effect of the sigmoid, exponent and power-law volume fraction, the thickness stretching and the material length scale parameter on the deflection, stresses and natural frequencies are discussed in tabular and graphical forms. The obtained results are compared with previously published results to verify the performance of this theory. It was clearly shown that this theory is not only accurate and efficient but almost comparable to other higher order shear deformation theories that contain more number of unknowns.

Keywords

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