Structural Engineering and Mechanics

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A novel shear and normal deformation theory for hygrothermal bending response of FGM sandwich plates on Pasternak elastic foundation

  • Abazid, Mohammad Alakel (Department of Mathematics and Statistics, Faculty of Science, King Faisal University) ;
  • Alotebi, Muneerah S. (Department of Mathematics, Faculty of Arts and Science at Nairiyah, Hafr Al Batin University) ;
  • Sobhy, Mohammed (Department of Mathematics and Statistics, Faculty of Science, King Faisal University)
  • Received : 2018.03.25
  • Accepted : 2018.05.13
  • Published : 2018.08.10
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Abstract

This paper deals with the static bending of various types of FGM sandwich plates resting on two-parameter elastic foundations in hygrothermal environment. The elastic foundation is modeled as Pasternak's type, which can be either isotropic or orthotropic and as a special case, it converges to Winkler's foundation if the shear layer is neglected. The present FGM sandwich plate is assumed to be made of a fully ceramic core layer sandwiched by metal/ceramic FGM coats. The governing equations are derived from principle of virtual displacements based on a shear and normal deformations plate theory. The present theory takes into account both shear and normal strains effects, thus it predicts results more accurate than the shear deformation plate theories. The results obtained by the shear and normal deformation theory are compared with those available in the literature and also with those obtained by other shear deformation theories. It is concluded that the present results are slightly deviated from other results because the normal deformation effect is taken into account. Numerical results are presented to show the effects of the different parameters, such as side-to-thickness ratio, foundation parameters, aspect ratio, temperature, moisture, power law index and core thickness on the stresses and displacements of the FG sandwich plates.

Keywords

References

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