The reel-lay method is a cost efficient alternative to the S-lay and J-lay methods for small to medium size steel offshore pipelines. The quality of the pipeline construction is enhanced by on-shore welding and inspection under controlled conditions. However, reeled pipelines are subjected to at least two symmetrical plastic strain cycles during installation. The plastic straining associated with reeled installation modifies the axial tensile response of the pipe material. Also, it has been suggested that plastic straining may reduce fracture toughness. In this work, small scale tests representative of conditions experienced under reeling of steel pipelines have been carried out. The fracture resistance curves obtained for the material in the as-received and strained conditions have been compared. No significant effect of the reeling strain cycle on the fracture toughness during subsequent straining was observed.
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June 2011
Research Papers
The Effect of Prestrain on Ductile Fracture Toughness of Reeled Pipeline Steels
Tomasz Tkaczyk,
Tomasz Tkaczyk
Offshore Engineering Division,
e-mail: ttkaczyk@technip.com
Technip
, Westhill, Aberdeenshire AB32 6TQ, UK
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Noel P. O’Dowd,
Noel P. O’Dowd
Department of Mechanical and Aeronautical Engineering, Materials and Surface Science Institute,
University of Limerick
, Limerick, Ireland
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Kamran Nikbin
Kamran Nikbin
Department of Mechanical Engineering,
Imperial College London
, London SW7 2AZ, UK
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Tomasz Tkaczyk
Offshore Engineering Division,
Technip
, Westhill, Aberdeenshire AB32 6TQ, UKe-mail: ttkaczyk@technip.com
Noel P. O’Dowd
Department of Mechanical and Aeronautical Engineering, Materials and Surface Science Institute,
University of Limerick
, Limerick, Ireland
Kamran Nikbin
Department of Mechanical Engineering,
Imperial College London
, London SW7 2AZ, UKJ. Pressure Vessel Technol. Jun 2011, 133(3): 031701 (8 pages)
Published Online: April 4, 2011
Article history
Received:
September 17, 2009
Revised:
July 14, 2010
Online:
April 4, 2011
Published:
April 4, 2011
Citation
Tkaczyk, T., O’Dowd, N. P., and Nikbin, K. (April 4, 2011). "The Effect of Prestrain on Ductile Fracture Toughness of Reeled Pipeline Steels." ASME. J. Pressure Vessel Technol. June 2011; 133(3): 031701. https://doi.org/10.1115/1.4002280
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