Fracture assessment of elastic-plastic steel pipelines subject to multi-cycle bending

Tomasz Tkaczyk, Noel P. O'Dowd, Kamran Nikbin, Brett P. Howard

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this work a large scale bending test, representative of conditions experienced under reeling of steel pipelines, is discussed. The pipeline material is an X65 steel and the pipe has a diameter of 273.1 mm (10.75") wall thickness of 14.3 mm. The pipe was subject to multi-cycle reverse bending in a four-point bending rig. The crack driving force in terms of crack tip opening displacement (CTOD) was measured and compared with the results from three-dimensional finite-element analysis of the notched pipe. A number of existing estimation schemes for crack driving force, in addition to a novel estimation scheme developed by the authors, have also been evaluated. An important feature of the latter scheme is the ability to account for a yield plateau in the deformation response of the material. It has been seen that the measured CTOD-strain relationships for multi-cycle bending are closely predicted by the new estimation scheme. The first cycle, in particular, provides a robust validation of the procedure as the material response in this case is strongly affected by the existence of a yield plateau in the material tensile response.

Original languageEnglish
Title of host publicationThe Proceedings of the 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
Pages110-117
Number of pages8
Publication statusPublished - 2009
Event19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE - Osaka, Japan
Duration: 21 Jun 200926 Jun 2009

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
Country/TerritoryJapan
CityOsaka
Period21/06/0926/06/09

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