Materials Technology

Corrosion Effects on Reliability of Flat Plates in Tension

[+] Author and Article Information
Weiwei Yu1

Chevron Energy Technology Company, Houston, TX, 77002weiwei.yu@chevron.com

Dale G. Karr2

 University of Michigan, Ann Arbor, MI, 48109dgkarr@umich.edu

Pedro M. Vargas

Chevron Technology Company, Houston, TX, 77002pedrovargas@chevron.com


Address all correspondence related to ASME style format and figures to this author.


Address all correspondence for other issues to this author.

J. Offshore Mech. Arct. Eng 134(2), 021404 (Dec 06, 2011) (7 pages) doi:10.1115/1.4004520 History: Received July 01, 2010; Revised March 26, 2011; Published December 06, 2011; Online December 06, 2011

Neuber’s theory of elastic and inelastic stress concentration factors are applied to the pit corrosion of plates. The finite element method is then employed to model the problem numerically and to calculate the stress concentration factors for semioblate spheroidal pits. Furthermore, corrosion development is a process with many random factors such as the geometry and the growth rate. A realistic reflection of corrosion effects on structural failure is to consider it within the framework of reliability analysis. By knowing the analytical formula of stress concentration factor, reliability analyses are conducted to calculate the reliability safety index of the panel based on a strain-based limit state. The structural failure can then be directly related to the reliability safety index. The reliability procedure is demonstrated in an example of a highly deformed bottom shell panel during ship grounding. Partial safety factors of two random variables which describe pit corrosion geometry and the effective nominal strain level are also calculated. Recommendations for using partial safety factors are provided.

Copyright © 2012 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 3

FE Notched specimen

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Figure 4

Meshing sensitivity analyses of both 3D and 2D models

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Figure 5

Maximum axial stress at the notch root predicted by analytical and FE methods

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Figure 1

Applying Neuber’s theory on notched specimen under uniaxial loading

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Figure 2

Notched specimen



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