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Title: Full range stress-strain relation modelling of pipeline steels
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2179s
Date of Publication: Sep 1 2009 12:00AM
Price: $25.00 US
Authors: Stijn Hertelé, Rudi Denys, and Wim De Waele
Abstract: IT IS STANDARD PRACTICE to model the post-yield behaviour of pipeline steels by means of the Ramberg-Osgood (RO) equation. However, errors can be made when the strain-hardening exponent or the slope of the stress-strain curve in the post-yield loading range varies with increasing strain. A new ‘UGent’ stress-strain model, outlined in this paper (presented at the Pipeline Technology Conference held in Ostend, Belgium, on 12-14 October, 2009), has been developed to address this problem. It successfully describes the ‘double-n’ strain hardening seen in contemporary high-strength TMCP pipeline steels.

References

1. W.Ramberg and W.R.Osgood, 1943. Description of stress-strain curves by three parameters. National Advisory Committee for Aeronautics, Technical Note 902.
2. H.N.Hill, 1944. Determination of stress-strain relations from the offset yield strength values. National Advisory Committee for Aeronautics, Technical Note 927.
3. CSA Z662, 2007. Oil and gas pipeline systems.
4. API 1104, 2007. Welding of pipelines and related facilities.
5. R.Denys, P.De Baets, A.Lefevre, and W.De Waele, 2002. Material tensile properties in relation to the failure behaviour of girth welds subject to plastic longitudinal strains. Proc. Conf. Application & Evaluation of High-Grade Linepipes in Hostile Environments, Yokohama, Japan, November 7-8, pp159-172.
6. S.Hertelé, W.De Waele, and R.Denys. To be published.
7. S.Webster and A.Bannister, 2000. Structural integrity assessment procedure for Europe - of the SINTAP programme overview. Engineering Fracture Mechanics, 67, 6, pp481-514.
8. W.De Waele, 2004. Effect of material properties on the plastic straining capacity of defective welds. PRICM 5: the 5th Pacific Rim International Conference on Advanced Materials and Processing, Beijing, China, November 2-5, pp2659-2662.
9. R. Denys, P.De Baets, and W.De Waele, 2003. Weld metal test performance requirements - a critical appraisal of future needs. Thermec’ 2003, Pts 1-5, Vols 426-430, pp4153-4158.
10. R. Denys, 2007. Interaction between material properties, inspection accuracy and defect acceptance levels in strain based pipeline design. Proc. NATO Advanced Research Workshop on Safety, Reliability and Risks Associated with Water, Oil and Gas Pipelines, Alexandria, Egypt, February 4-8, pp45-64.
11. R. Denys, 2008. Weld metal strength mismatch: past, present and future. Proc. International Symposium to Celebrate Prof. Masao Toyoda’s Retirement from Osaka University, Osaka, Japan, pp115-148.
12. D.W.Marquardt, 1963. An algorithm for least-squares estimation of nonlinear parameters. J. Soc. for Industrial and Applied Mathematics, 11, 2, pp431-441.

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