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A Refined Theory for Bending Vibratory Analysis of Thick Functionally Graded Beams

Youssef Boutahar, Nadhir Lebaal and David Bassir
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Youssef Boutahar: Laboratoire Interdisciplinaire Carnot de Bourgogne, Université Bourgogne Franche-Comté (UTBM), CEDEX, 90010 Belfort, France
Nadhir Lebaal: Laboratoire Interdisciplinaire Carnot de Bourgogne, Université Bourgogne Franche-Comté (UTBM), CEDEX, 90010 Belfort, France
David Bassir: Laboratoire LMC, Université Bourgogne Franche-Comté (UTBM), UMR-CNRS 5060, CEDEX, 90010 Belfort, France

Mathematics, 2021, vol. 9, issue 12, 1-16

Abstract: A refined beam theory that takes the thickness-stretching into account is presented in this study for the bending vibratory behavior analysis of thick functionally graded (FG) beams. In this theory, the number of unknowns is reduced to four instead of five in the other approaches. Transverse displacement is expressed through a hyperbolic function and subdivided into bending, shear, and thickness-stretching components. The number of unknowns is reduced, which involves a decrease in the number of the governing equation. The boundary conditions at the top and bottom FG beam faces are satisfied without any shear correction factor. According to a distribution law, effective characteristics of FG beam material change continuously in the thickness direction depending on the constituent’s volume proportion. Equations of motion are obtained from Hamilton’s principle and are solved by assuming the Navier’s solution type, for the case of a supported FG beam that is transversely loaded. The numerical results obtained are exposed and analyzed in detail to verify the validity of the current theory and prove the influence of the material composition, geometry, and shear deformation on the vibratory responses of FG beams, showing the impact of normal deformation on these responses which is neglected in most of the beam theories. The obtained results are compared with those predicted by other beam theories. It can be concluded that the present theory is not only accurate but also simple in predicting the bending and free vibration responses of FG beams.

Keywords: refined beam-theory; functionally graded beam; thickness stretching; composites; vibration; frequency response (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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