Two types of specimen for crack tip opening angle (CTOA) measurement have been investigated for pipeline applications, i.e., the modified double cantilever beam (MDCB) (at NIST) and the drop-weight tear test (DWTT) specimen (at CANMET). Results of effects of specimen types, thicknesses and loading rates on CTOA are summarized and discussed. The main observations include: (i) For both MDCB and DWTT specimens tested at quasi-static loading rate, crack front tunnelling (i.e., with a deep triangular crack-tip shape) was present in high-strength steels; (ii) For DWTT specimens, CTOA values measured optically at the surface were significantly higher than those from the simplified single-specimen method (S-SSM) and those measured at mid-thickness [on sections cut using electric discharge machining (EDM)]; and (iii) CTOA values from surface measurement of MDCB specimens were comparable to those derived from S-SSM of DWTT specimens, but the surface values of DWTT were higher than those of MDCB specimens.
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2010 8th International Pipeline Conference
September 27–October 1, 2010
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4421-2
PROCEEDINGS PAPER
Measurement of CTOA of Pipe Steels Using MDCB and DWTT Specimens Available to Purchase
C. N. McCowan,
C. N. McCowan
NIST, Materials Reliability Division (853), Boulder, CO
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E. S. Drexler,
E. S. Drexler
NIST, Materials Reliability Division (853), Boulder, CO
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J. D. McColskey,
J. D. McColskey
NIST, Materials Reliability Division (853), Boulder, CO
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Ph. P. Darcis
Ph. P. Darcis
NIST, Materials Reliability Division (853), Boulder, CO
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S. Xu
CANMET-MTL, Ottawa, ON, Canada
W. R. Tyson
CANMET-MTL, Ottawa, ON, Canada
R. Eagleson
CANMET-MTL, Ottawa, ON, Canada
C. N. McCowan
NIST, Materials Reliability Division (853), Boulder, CO
E. S. Drexler
NIST, Materials Reliability Division (853), Boulder, CO
J. D. McColskey
NIST, Materials Reliability Division (853), Boulder, CO
Ph. P. Darcis
NIST, Materials Reliability Division (853), Boulder, CO
Paper No:
IPC2010-31076, pp. 269-278; 10 pages
Published Online:
April 4, 2011
Citation
Xu, S, Tyson, WR, Eagleson, R, McCowan, CN, Drexler, ES, McColskey, JD, & Darcis, PP. "Measurement of CTOA of Pipe Steels Using MDCB and DWTT Specimens." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 2. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 269-278. ASME. https://doi.org/10.1115/IPC2010-31076
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