TY - GEN
T1 - A non-linear fracture assessment procedure for pipeline materials with a yield plateau
AU - Tkaczyk, Tomasz
AU - O'Dowd, Noel P.
AU - Nikbin, Kamran
AU - Howard, Brett P.
PY - 2009
Y1 - 2009
N2 - An accurate defect assessment procedure is needed to ensure integrity of girth welded steel pipelines while avoiding unnecessary repairs. An integral part of such a procedure is an estimation scheme for the crack driving force. In a recent paper, a modified reference stress method has been proposed by the authors for the assessment of elastic-plastic pipes with surface breaking defects. For materials with continuous yielding the method has been shown to provide accurate estimates of crack driving force. However, for materials with a yield plateau (Lüders plateau), the description of the evolution of the crack driving force is less accurate. In this work, a method for the estimation of crack driving force (phrased in terms of the J-integral) for surface breaking pipeline defects, applicable to materials with a yield plateau, is proposed. The method is validated by comparing the predictions with the results of three-dimensional finite-element analysis of a surface cracked pipe under tension and bending loading.
AB - An accurate defect assessment procedure is needed to ensure integrity of girth welded steel pipelines while avoiding unnecessary repairs. An integral part of such a procedure is an estimation scheme for the crack driving force. In a recent paper, a modified reference stress method has been proposed by the authors for the assessment of elastic-plastic pipes with surface breaking defects. For materials with continuous yielding the method has been shown to provide accurate estimates of crack driving force. However, for materials with a yield plateau (Lüders plateau), the description of the evolution of the crack driving force is less accurate. In this work, a method for the estimation of crack driving force (phrased in terms of the J-integral) for surface breaking pipeline defects, applicable to materials with a yield plateau, is proposed. The method is validated by comparing the predictions with the results of three-dimensional finite-element analysis of a surface cracked pipe under tension and bending loading.
UR - http://www.scopus.com/inward/record.url?scp=74849125324&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:74849125324
SN - 9781880653531
T3 - Proceedings of the International Offshore and Polar Engineering Conference
SP - 100
EP - 109
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 -