A crack is highly constrained in traditional toughness tests, e.g., CVN and SE(B). However, a crack in the girth welds of pipelines under longitudinal loading is low constrained. Curved wide plate (CWP) test provides similar constraint condition as that of pipeline girth weld. CWP tests are being used recently for strain-based design. One of the desirable outcomes from those tests is fracture toughness resistance curves. The resistance curve consists of two components, the crack growth and the toughness measure, such as J-integral or CTOD. The paper describes the development of procedures for the determination of those two components. A normalized equation was developed to estimate the crack growth from the experimentally measured unloading compliance. The equation was verified by multiple FEA simulations with different pipe geometries and materials. The second set of equations was developed to evaluate the J-integral through an incremental frame based on the instantaneous crack growth and the load-CMOD record. The application of the resistance curve procedures was demonstrated through CWP tests of X80 and X100 welds.
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2012 9th International Pipeline Conference
September 24–28, 2012
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute
- Pipeline Division
ISBN:
978-0-7918-4515-8
PROCEEDINGS PAPER
Determination of J Resistance Curves From CWP Specimens Available to Purchase
Fan Zhang,
Fan Zhang
Center for Reliable Energy Systems, Dublin, OH
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Honggang Zhou,
Honggang Zhou
Center for Reliable Energy Systems, Dublin, OH
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Yong-Yi Wang,
Yong-Yi Wang
Center for Reliable Energy Systems, Dublin, OH
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Ming Liu,
Ming Liu
Center for Reliable Energy Systems, Dublin, OH
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Yaxin Song
Yaxin Song
Center for Reliable Energy Systems, Dublin, OH
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Fan Zhang
Center for Reliable Energy Systems, Dublin, OH
Honggang Zhou
Center for Reliable Energy Systems, Dublin, OH
Yong-Yi Wang
Center for Reliable Energy Systems, Dublin, OH
Ming Liu
Center for Reliable Energy Systems, Dublin, OH
Yaxin Song
Center for Reliable Energy Systems, Dublin, OH
Paper No:
IPC2012-90639, pp. 383-390; 8 pages
Published Online:
July 25, 2013
Citation
Zhang, F, Zhou, H, Wang, Y, Liu, M, & Song, Y. "Determination of J Resistance Curves From CWP Specimens." Proceedings of the 2012 9th International Pipeline Conference. Volume 4: Pipelining in Northern and Offshore Environments; Strain-Based Design; Risk and Reliability; Standards and Regulations. Calgary, Alberta, Canada. September 24–28, 2012. pp. 383-390. ASME. https://doi.org/10.1115/IPC2012-90639
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