TY - GEN
T1 - Fracture assessment of elastic-plastic steel pipelines subject to multi-cycle bending
AU - Tkaczyk, Tomasz
AU - O'Dowd, Noel P.
AU - Nikbin, Kamran
AU - Howard, Brett P.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=74849102053&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:74849102053
SN - 9781880653531
T3 - Proceedings of the International Offshore and Polar Engineering Conference
SP - 110
EP - 117
BT - The Proceedings of the 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
T2 - 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
Y2 - 21 June 2009 through 26 June 2009
ER -