Free Vibration of Functionally Graded Shells with Graphene Platelets Reinforcement using Improved First-Order Shear Deformation Theory
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Abstract
This paper presents a semi-analytical formulation for the free vibration of functionally graded shells with graphene platelets reinforcement using improved first-order shear deformation theory. The effective Young’s modulus of the functionally graded material (FGM) is determined using Voigt’s model, while the effective Young’s modulus of the graphene platelet (GPL) reinforcement is predicted by the Halpin–Tsai micromechanical model. Additionally, the effective Poisson’s ratio and density are calculated using the rule of mixtures. The governing equations for FGM shells reinforced with GPL are formulated using the improved first-order shear deformation theory (FSDT). The equations of motion are derived using Hamilton’s principle, and the numerical solutions are obtained through Navier’s method. The present results demonstrate excellent agreement with various shear deformation theories reported in the existing literature. The numerical results indicate that the FGM shells reinforced with GPL pattern B yield the highest natural frequency. This is because the maximum GPL content is distributed near the top and bottom surfaces, where the normal stresses are highest. Furthermore, this GPL distribution effectively satisfies the actual normal stress requirements of the shells.
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