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Research Papers: Design and Analysis

Thermal Postbuckling of Imperfect Circular Functionally Graded Material Plates: Examination of Voigt, Mori–Tanaka, and Self-Consistent Schemes

[+] Author and Article Information
Y. Kiani

Mechanical Engineering Department,
Amirkabir University of Technology,
Tehran, Iran
e-mail: y.kiani@aut.ac.ir

M. R. Eslami

ASME Fellow
Professor and Fellow of the Academy of Sciences
Mechanical Engineering Department,
Amirkabir University of Technology,
Tehran, Iran
e-mail: eslami@aut.ac.ir

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 14, 2013; final manuscript received March 1, 2014; published online October 15, 2014. Assoc. Editor: Spyros A. Karamanos.

J. Pressure Vessel Technol 137(2), 021201 (Oct 15, 2014) (11 pages) Paper No: PVT-13-1211; doi: 10.1115/1.4026993 History: Received December 14, 2013; Revised March 01, 2014

Thermal postbuckling of solid circular plates made of a through-the-thickness functionally graded material (FGM) is analyzed in this paper. Initial imperfection of the plate is also taken into account. Each thermomechanical property of the plate is assumed to be a function of the temperature and thickness coordinate. Equivalent properties of the FGM media are obtained based on three different homogenization schemes, namely, Voigt rule, Mori–Tanaka scheme, and self-consistent estimate. Temperature profile is assumed to be through-the-thickness direction only. The solution of the heat conduction equation is obtained using an iterative central finite difference scheme. Various types of thermal loadings, such as uniform temperature rise, temperature specified at surfaces, and heat flux, are considered. Nonlinear equilibrium equations of the plate are obtained by means of the conventional Ritz method. Solution of the resulting nonlinear equilibrium equations and temperature distribution are obtained simultaneously at each step of heating. It is shown that response of a perfect clamped FGM plate is of the bifurcation type of buckling with stable postbuckling equilibrium branch, whereas imperfect clamped and perfect/imperfect simply supported FGM plates do not reveal the bifurcation type of instability through the nonuniform heating process. Furthermore, amplitude of initial imperfection is an important factor on the equilibrium path of FGM circular plates, especially for simply supported ones.

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Figures

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Fig. 2

Influence of power law index on equilibrium path of clamped FGM plates subjected to uniform temperature rise loading

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Fig. 6

Influence of power law index on equilibrium path of clamped FGM plates subjected to temperature specified boundary conditions

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Fig. 8

Influence of initial imperfection on equilibrium path of simply supported FGM plates subjected to temperature specified boundary conditions

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Fig. 9

Influence of power law index on equilibrium path of simply supported FGM plates subjected to heat flux

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Fig. 10

Influence of power law index on equilibrium path of imperfect/perfect clamped FGM plates subjected to heat flux

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Fig. 1

A comparison on thermal postbuckling of perfect and imperfect homogeneous circular plate subjected to uniform temperature rise loading

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Fig. 5

Influence of initial imperfection on equilibrium path of simply supported FGM plates subjected to uniform temperature rise loading

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Fig. 7

Influence of power law index on equilibrium path of simply supported FGM plates subjected to temperature specified boundary conditions

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Fig. 3

Influence of initial imperfection on equilibrium path of clamped FGM plates subjected to uniform temperature rise loading

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Fig. 4

Influence of power law index on equilibrium path of simply supported FGM plates subjected to uniform temperature rise loading

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