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Title: The influence of the Y/T ratio on the failure assessment of corroded pipelines
Category: Technical papers from the Journal of Pipeline Integrity
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2073
Date of Publication: Sept 2005
Price: $25.00 US
Authors: Dr Xian-Kui Zhu and Dr Brian N Leis
Abstract: This paper investigates the influence of yield-to-tensile strength ratio (Y/T) 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 pipeline steels is characterized by a power-law hardening curve, and the plastic deformation obeys the Mises’ yield criterion and the deformation theory of plasticity. Two formulae to estimate the strain hardening exponent n for a specific Y/T are proposed, and a closed-form solution to the limit pressure of pipes is derived as a function of Y/T. This plastic collapse model is then extended to predict the failure pressure of pipelines with corrosion defects. The influence of Y/T on the failure behavior of pipelines is thus discussed. Numerical and experimental comparisons are finally presented for validations of the present solutions.
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