The effects of specimen geometry on the fatigue crack growth rates (FCGR) in API X65 and X100 pipeline steels were explored by use of the middle tension and compact tension specimen geometries. It was found that the specimen type has little influence on the stage II linear fatigue crack growth region for these steels. Furthermore, the FCGR behavior in the longitudinal and transverse directions was found to be nearly identical for both steels. Also of interest was a comparison of the FCGR results to the BS 7910 design curves, which showed a discrepancy between the results and the standard only at low delta K levels. A finite element analysis of the compliance relationships used to predict the crack lengths during testing of both specimen types revealed that the expression for both the middle tension specimen and the compact tension specimen were found to be valid. Although the curved geometry of the middle tension specimen caused slightly different compliance results, these differences did not appear to affect the FCGR results.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4859-3
PROCEEDINGS PAPER
Effects of Specimen Geometry on Fatigue-Crack Growth Rates in Pipeline Steels
J. M. Treinen,
J. M. Treinen
National Institute of Standards and Technology, Boulder, CO
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Ph. P. Darcis,
Ph. P. Darcis
National Institute of Standards and Technology, Boulder, CO
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J. D. McColskey,
J. D. McColskey
National Institute of Standards and Technology, Boulder, CO
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J. Merritt
J. Merritt
U.S. DOT/PHMSA, Washington, DC
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J. M. Treinen
National Institute of Standards and Technology, Boulder, CO
Ph. P. Darcis
National Institute of Standards and Technology, Boulder, CO
J. D. McColskey
National Institute of Standards and Technology, Boulder, CO
R. Smith
U.S. DOT/PHMSA, Washington, DC
J. Merritt
U.S. DOT/PHMSA, Washington, DC
Paper No:
IPC2008-64360, pp. 267-272; 6 pages
Published Online:
June 29, 2009
Citation
Treinen, JM, Darcis, PP, McColskey, JD, Smith, R, & Merritt, J. "Effects of Specimen Geometry on Fatigue-Crack Growth Rates in Pipeline Steels." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 3. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 267-272. ASME. https://doi.org/10.1115/IPC2008-64360
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