The clamped single edge-notched tension (SE(T)) specimen has been widely used in a single-specimen testing scheme to generate fracture resistance curves for high strength line-pipe steels. The SE(T) specimen with appropriate notch geometry is a low-constraint specimen designed to reduce conservatism in the measurement of fracture toughness. The crack driving force is taken as either the J-integral or crack tip opening displacement (CTOD); it is generally accepted that the two parameters are interchangeable and equivalent using a simple closed form solution. However, the assumption that they are interchangeable, and to what extent, hasn’t been previously investigated experimentally on the same SE(T) specimen. This paper presents multiple test methods that were simultaneously employed on the same SE(T) specimens. The instrumentation includes: clip-gauges to measure surface crack mouth opening displacements (CMOD) and CTOD by the double-clip-gauge method; strain-gage arrays for direct J-integral measurements; and direct-current potential-drop (DCPD) instrumentation for supplementary crack size measurement. A direct comparison of ductile crack-growth resistance curves generated using J-integral and CTOD is presented here where each represents a different experimental and analytical approach. The two methods are in reasonable agreement over a narrow range of crack growth, differing slightly at initiation and diverging with increasing crack growth. Analysis of the supplementary instrumentation (i.e., strain gages, extensometers and DCPD) will be provided in a future publication.
Skip Nav Destination
2014 10th International Pipeline Conference
September 29–October 3, 2014
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
978-0-7918-4613-1
PROCEEDINGS PAPER
Direct Comparison of Single-Specimen Clamped SE(T) Test Methods on X100 Line Pipe Steel Available to Purchase
Timothy S. Weeks,
Timothy S. Weeks
National Institute of Standards and Technology, Boulder, CO
Search for other works by this author on:
Enrico Lucon
Enrico Lucon
Protiro, Inc., Boulder, CO
Search for other works by this author on:
Timothy S. Weeks
National Institute of Standards and Technology, Boulder, CO
Enrico Lucon
Protiro, Inc., Boulder, CO
Paper No:
IPC2014-33695, V004T11A021; 16 pages
Published Online:
December 9, 2014
Citation
Weeks, TS, & Lucon, E. "Direct Comparison of Single-Specimen Clamped SE(T) Test Methods on X100 Line Pipe Steel." Proceedings of the 2014 10th International Pipeline Conference. Volume 4: Production Pipelines and Flowlines; Project Management; Facilities Integrity Management; Operations and Maintenance; Pipelining in Northern and Offshore Environments; Strain-Based Design; Standards and Regulations. Calgary, Alberta, Canada. September 29–October 3, 2014. V004T11A021. ASME. https://doi.org/10.1115/IPC2014-33695
Download citation file:
27
Views
Related Proceedings Papers
Related Articles
Low-Constraint Toughness Testing of Two Single-Edge Notched Tension Methods in a Single Specimen
J. Pressure Vessel Technol (October,2016)
The Effects of Residual Stress Distribution and Component Geometry on the Stress Intensity Factor of Surface Cracks
J. Pressure Vessel Technol (February,2011)
Pipe Deformation During a Running Shear Fracture in Line Pipe
J. Eng. Mater. Technol (October,1974)
Related Chapters
Fracture Testing with Surface Crack Specimens
Developments in Fracture Mechanics Test Methods Standardization
Recent Developments in J Ic Testing
Developments in Fracture Mechanics Test Methods Standardization
Investigation of Some Problems In Developing Standards for Precracked Charpy Slow Bend Tests
Developments in Fracture Mechanics Test Methods Standardization