Nonlinear dynamic analysis of moving bilayer plates resting on elastic foundations

doi:10.1007/s10483-020-2587-8

摘要/Abstract

摘要： The aim of this study is to investigate the dynamic response of axially moving two-layer laminated plates on the Winkler and Pasternak foundations. The upper and lower layers are formed from a bidirectional functionally graded (FG) layer and a graphene platelet (GPL) reinforced porous layer, respectively. Henceforth, the combined layers will be referred to as a two-dimensional (2D) FG/GPL plate. Two types of porosity and three graphene dispersion patterns, each of which is distributed through the plate thickness, are investigated. The mechanical properties of the closed-cell layers are used to define the variation of Poisson's ratio and the relationship between the porosity coefficients and the mass density. For the GPL reinforced layer, the effective Young's modulus is derived with the Halpin-Tsai micro-system model, and the rule of mixtures is used to calculate the effective mass density and Poisson's ratio. The material of the upper 2D-FG layer is graded in two directions, and its effective mechanical properties are also derived with the rule of mixtures. The dynamic governing equations are derived with a first-order shear deformation theory (FSDT) and the von Kármán nonlinear theory. A combination of the dynamic relaxation (DR) and Newmark's direct integration methods is used to solve the governing equations in both time and space. A parametric study is carried out to explore the effects of the porosity coefficients, porosity and GPL distributions, material gradients, damping ratios, boundary conditions, and elastic foundation stiffnesses on the plate response. It is shown that both the distributions of the porosity and graphene nanofillers significantly affect the dynamic behaviors of the plates. It is also shown that the reduction in the dynamic deflection of the bilayer composite plates is maximized when the porosity and GPL distributions are symmetric.

关键词: moving laminated plate, bidirectional functionally graded material (FGM), graphene nanoplatelet, porosity, first-order shear deformation theory (FSDT), Newmark's integration method

Abstract: The aim of this study is to investigate the dynamic response of axially moving two-layer laminated plates on the Winkler and Pasternak foundations. The upper and lower layers are formed from a bidirectional functionally graded (FG) layer and a graphene platelet (GPL) reinforced porous layer, respectively. Henceforth, the combined layers will be referred to as a two-dimensional (2D) FG/GPL plate. Two types of porosity and three graphene dispersion patterns, each of which is distributed through the plate thickness, are investigated. The mechanical properties of the closed-cell layers are used to define the variation of Poisson's ratio and the relationship between the porosity coefficients and the mass density. For the GPL reinforced layer, the effective Young's modulus is derived with the Halpin-Tsai micro-system model, and the rule of mixtures is used to calculate the effective mass density and Poisson's ratio. The material of the upper 2D-FG layer is graded in two directions, and its effective mechanical properties are also derived with the rule of mixtures. The dynamic governing equations are derived with a first-order shear deformation theory (FSDT) and the von Kármán nonlinear theory. A combination of the dynamic relaxation (DR) and Newmark's direct integration methods is used to solve the governing equations in both time and space. A parametric study is carried out to explore the effects of the porosity coefficients, porosity and GPL distributions, material gradients, damping ratios, boundary conditions, and elastic foundation stiffnesses on the plate response. It is shown that both the distributions of the porosity and graphene nanofillers significantly affect the dynamic behaviors of the plates. It is also shown that the reduction in the dynamic deflection of the bilayer composite plates is maximized when the porosity and GPL distributions are symmetric.

Key words: moving laminated plate, bidirectional functionally graded material (FGM), graphene nanoplatelet, porosity, first-order shear deformation theory (FSDT), Newmark's integration method

中图分类号:

M. ESMAEILZADEH, M. KADKHODAYAN, S. MOHAMMADI, G. J. TURVEY. Nonlinear dynamic analysis of moving bilayer plates resting on elastic foundations[J]. Applied Mathematics and Mechanics (English Edition), 2020, 41(3): 439-458.

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