The influence of mechanical uncertainties on the free vibration of functionally graded graphene-reinforced porous nanocomposite shells of revolution. (1st February 2021)

• Record Type: Journal Article
• Authors: Baghlani, A.; Najafgholipour, M.A.; Khayat, M.
• Is Part Of: Engineering structures. Volume 228(2021)
• Publication Date: 2021-02-01
• Subjects: Free vibration behavior -- Fourier differential quadrature -- Graphene platelet reinforcement -- Functionally graded porous material -- Sensitivity analysis -- Uncertainty analysis; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.111356
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The influence of mechanical uncertainties on the free vibration response of FGP-GPL shells of revolution is assessed. The uncertainties in the material properties as well as the geometry of the reinforcements are considered. The interval analysis method which is an appropriate technique for the uncertainty analysis of systems with bounded uncertainties is utilized. The dynamic response of the FGP-GPL shells of revolution with positive, negative and zero Gaussian curvature is assessed. The shells' type of curvature has a significant effect on the trend of uncertainty propagation and the sensitivity of the vibration frequencies in terms of various sources of uncertainty. Abstract: This paper is concerned with the analysis of uncertainty propagation in the free vibration response of functionally graded porous (FGP) nanocomposite shells of revolution reinforced with graphene platelet (GPL). In this regard, the effects of uncertainties in the material properties as well as the geometry of the reinforcements on the free vibration responses of the FGP-GPL shells with different types of Gaussian curvature are assessed. The propagation of uncertainty and frequency sensitivity of the shells of revolution are examined for various GPL dispersions and porosity distributions. For this purpose, the interval analysis method which is an appropriate technique for the uncertainty analysis of systems with bounded uncertainties is utilized. In order to solve the equations of motion based on the higher-order shear deformation theory and to obtain the free vibration responses of the shells of revolution, the Fourier Differential Quadrature (FDQ) technique is employed. According to the analysis results, the shells' type of curvature has a significant effect on the trend of uncertainty propagation and the sensitivity of the vibration frequencies in terms of various sources of uncertainty. Moreover, the results show that the uncertainty propagation and sensitivity are different in the frequencies corresponding to different modes of vibration.