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Research Papers: Design and Analysis

Use of Functionally Graded Material Layers in a Two-Layered Pressure Vessel

[+] Author and Article Information
E. Carrera1

Department of Aeronautics and Space Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italyerasmo.carrera@polito.it

M. Soave

Department of Aeronautics and Space Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

1

Corresponding author.

J. Pressure Vessel Technol 133(5), 051202 (Jul 11, 2011) (11 pages) doi:10.1115/1.4003458 History: Received December 09, 2009; Revised November 24, 2010; Published July 11, 2011; Online July 11, 2011

This work explores the possibilities of using functionally graded material (FGM) layers to reduce normal and shear stress gradients due to internal pressure and thermal loadings at the interface of a two-layered wall pressure vessel. The two walls are made of an internal thin metallic layer (titanium used as a liner to avoid a chemical/physical reaction between the gas and the external layer) and an external thick layer (carbon fiber used as a structural restraint). Two main geometrical elements are investigated: a cylindrical shell and a spherical panel. The shell analysis has been made by referring to mixed layerwise theories, which lead to a three-dimensional description of the stress/strain fields in the thickness shell direction; results related to the first order shear deformation theory are given for comparison purposes. It has been concluded that it is convenient to use FGM layers to reduce shear and normal stress gradients at the interfaces. Furthermore, the FGM layers lead to benefits as far as buckling load is concerned; lower values of in-plane shear and longitudinal compressive stresses are, in fact, obtained with respect to a pure two-layered wall.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 10

Cylindrical shell under thermal loading. Comparison of stress fields.

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Figure 2

Geometry of cylindrical shell

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Figure 3

Layers and wall lay-up geometry of the considered shells

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Figure 4

Allowable pressure versus wall thickness. Comparison of various wall lay-ups for a cylindrical shell.

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Figure 5

Variation in elastic modulus through the thickness for the considered wall lay-up

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Figure 6

Cylindrical shell under mechanical loading. Comparison of the through-the-thickness distribution of displacement variables.

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Figure 7

Cylindrical shell. Comparison of stress fields.

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Figure 8

Cylindrical shell under mechanical loading. Comparison between quasi-3D solution and FSDT type analysis.

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Figure 9

Spherical panel. Comparison of stress fields.

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Figure 1

Geometry of pressure vessel. Cylindrical and spherical shells analyzed in the present work.

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