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Research Papers: Design and Analysis

Thermal Hot Spot and Corrosion Damage in Conical Pressure Components

[+] Author and Article Information
R. Adibi-Asl1

Faculty of Engineering and Applied Science, Memorial University, St. John’s, NL, A1B 3X5, Canadareza.adibiasl@amec.com

R. Seshadri

Faculty of Engineering and Applied Science, Memorial University, St. John’s, NL, A1B 3X5, Canada

1

Present address: AMEC NSS Ltd., 393 University Ave., Toronto, ON, M5G 1E6, Canada.

J. Pressure Vessel Technol 133(3), 031203 (Mar 30, 2011) (7 pages) doi:10.1115/1.4001923 History: Received March 02, 2010; Revised May 08, 2010; Published March 30, 2011; Online March 30, 2011

Structural integrity of an in-service component containing damage such as corrosion and thermal hot spot has to be evaluated regularly so as to certify the acceptance and safety of continued service of the component. In this paper, limit load solutions of a damaged conical shell, particularly local wall thinning and thermal hot spot, is investigated. The derived solutions are based on identifying the regions in the damaged component that directly participate in the plastic action (kinematically active). The concepts of reference volume and decay length are employed to identify the kinematically active regions in the damaged conical shell. The different solutions proposed in this paper are compared with the elastic-plastic finite element analysis. The results indicate that proposed solutions can be used with acceptable accuracy to make integrity assessment decisions.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Conical shell with localized distributed load

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Figure 2

Schematic variation of displacement in the vicinity of the applied load

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Figure 3

Reference volume dimensions for localized damage in a conical shell

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Figure 4

Two different load cases for investigate the decay lengths

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Figure 5

Finite element mesh for undamaged conical shell (for decay lengths investigation)

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Figure 6

Variation of displacements: (a) meridional direction and (b) circumferential direction

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Figure 7

Damaged conical shell: (a) finite element modeling and (b) finite element mesh

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