Nonlinear vibration and postbuckling of functionally graded graphene reinforced porous nanocomposite beams

Chen, Da, Yang, Jie and Kitipornchai, Sritawat (2017) Nonlinear vibration and postbuckling of functionally graded graphene reinforced porous nanocomposite beams. Composites Science and Technology, 142 235-245. doi:10.1016/j.compscitech.2017.02.008

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Author Chen, Da
Yang, Jie
Kitipornchai, Sritawat
Title Nonlinear vibration and postbuckling of functionally graded graphene reinforced porous nanocomposite beams
Journal name Composites Science and Technology   Check publisher's open access policy
ISSN 0266-3538
Publication date 2017-04-12
Sub-type Article (original research)
DOI 10.1016/j.compscitech.2017.02.008
Open Access Status File (Author Post-print)
Volume 142
Start page 235
End page 245
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2503 Ceramics and Composites
2200 Engineering
Abstract The nonlinear free vibration and postbuckling behaviors of multilayer functionally graded (FG) porous nanocomposite beams that are made of metal foams reinforced by graphene platelets (GPLs) are investigated in this paper. The internal pores and GPL nanofillers are uniformly dispersed within each layer but both porosity coefficient and GPL weight fraction change from layer to layer, resulting in position-dependent elastic moduli, mass density and Poisson's ratio along the beam thickness. The mechanical property of closed-cell cellular solids is employed to obtain the relationship between coefficients of porosity and mass density. The effective material properties of the nanocomposite are determined based on the Halpin-Tsai micromechanics model for Young's modulus and the rule of mixture for mass density and Poisson's ratio. Timoshenko beam theory and von Kármán type nonlinearity are used to establish the differential governing equations that are solved by Ritz method and a direct iterative algorithm to obtain the nonlinear vibration frequencies and postbuckling equilibrium paths of the beams with different end supports. Special attention is given to the effects of varying porosity coefficients and GPL's weight fraction, dispersion pattern, geometry and size on the nonlinear behavior of the porous nanocomposite beam. It is found that the addition of a small amount of GPLs can remarkably reinforce the stiffness of the beam, and its nonlinear vibration and postbuckling performance is significantly influenced by the distribution patterns of both internal pores and GPL nanofillers.
Keyword Functionally graded beam
Graphene platelet
Nonlinear free vibration
Porous nanocomposites
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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