Free vibration and elastic buckling of functionally graded porous beams reinforced by graphene platelets

Kitipornchai, S, Chen, D and Yang, J 2017, 'Free vibration and elastic buckling of functionally graded porous beams reinforced by graphene platelets', Materials and Design, vol. 116, pp. 656-665.


Document type: Journal Article
Collection: Journal Articles

Title Free vibration and elastic buckling of functionally graded porous beams reinforced by graphene platelets
Author(s) Kitipornchai, S
Chen, D
Yang, J
Year 2017
Journal name Materials and Design
Volume number 116
Start page 656
End page 665
Total pages 10
Publisher Elsevier
Abstract This paper studies free vibration and elastic buckling of functionally graded porous nanocomposite beams where the internal pores and graphene platelets (GPLs) are layer-wise distributed in the matrix either uniformly or non-uniformly according to three different patterns. A multilayer beam model is proposed with material parameters varying across layers to achieve graded distributions in both porosity and nanofillers. Mechanical properties of closed-cell cellular solids under Gaussian Random Field scheme are used to determine the variation of Poisson's ratio and the relationship between porosity coefficients and mass density. The elastic modulus of the nanocomposite is obtained by using Halpin-Tsai micromechanics model. Theoretical formulations are based on Timoshenko beam theory and Ritz method is employed to obtain the dimensionless fundamental natural frequency and critical buckling load of porous nanocomposite beams. A comprehensive parametric study is carried out, with a particular focus on the effects of weight fraction, distribution pattern, geometry and size of GPL reinforcements on the free vibration and buckling behaviors of the nanocomposite beam with different metal matrixes and porosity coefficients. The results indicate that the effective stiffness of the porous nanocomposite beam can be best improved when both porosity distribution and GPL dispersion pattern are non-uniform but symmetric.
Subject Solid Mechanics
Structural Engineering
Keyword(s) Free vibration
elastic buckling
Functionally graded porous materials
Graphene platelet
Timoshenko beam theory
DOI - identifier 10.1016/j.matdes.2016.12.061
Copyright notice © 2016 Elsevier Ltd
ISSN 0264-1275
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