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RESEARCH PAPERS

Influence of Yield-to-Tensile Strength Ratio on Failure Assessment of Corroded Pipelines

[+] Author and Article Information
Xian-Kui Zhu

 Battelle Memorial Institute, 505 King Avenue, Columbus, Ohio 43201zhux@battelle.org

Brian N. Leis

 Battelle Memorial Institute, 505 King Avenue, Columbus, Ohio 43201

J. Pressure Vessel Technol 127(4), 436-442 (Jun 01, 2005) (7 pages) doi:10.1115/1.2042481 History: Received August 27, 2003; Revised June 01, 2005

This paper investigates the influence of yield-to-tensile strength ratio (YT) on failure pressure of pipelines without and with corrosion defects. Based on deformation instability and finite strain theory, a plastic collapse model for end-capped defect-free pipes is developed. The stress-strain response of materials is characterized by a power-law hardening curve, and the plastic deformation obeys the von Mises yield criterion and the deformation theory of plasticity. Two formulas to estimate the strain hardening exponent n for a specific YT are obtained, and a closed-form solution to the limit pressure of pipes is derived as a function of YT. This plastic collapse model is then extended to predict the failure pressure of pipelines with corrosion defects. Numerical and experimental comparisons are presented that validate the present models which characterize the influence of YT on the failure behavior of pipeline.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Variation of Y∕T with n for yield stress defined at (a) 0.2% offset strain, (b) 0.5% total strain

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Figure 2

Comparisons of strain hardening exponent n estimated from Eqs. 11,12, and determined by experiments

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Figure 3

Variations of Y∕T and n with the pipe steel grade

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Figure 4

Variation of n with the specified minimum yield stress or tensile stresses for pipeline steels ranging from Grade B to X80

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Figure 5

(a) Variation of limit pressure with Y∕T; (b) Variation of hoop stress and Mises stress with Y∕T

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Figure 6

Variation of limit pressure of corroded load with Y∕T for defect length L∕R0t0*=5 and defect depth d∕t=0.2,0.5,0.8

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Figure 7

Comparison of the limit pressure determined from the present plastic collapse model, FEA calculation, and experimental analysis for defect-free pipes

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Figure 8

Comparison of the predicted failure pressure with the actual failure pressure for corroded pipes by use of the actual UTS

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