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Title: Fracture resistance curve testing of X80 pipeline steel using the SENB specimen and normalization method
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2133s
Date of Publication: June, 2008
Price: $25.00 US
Authors: Dr Xian-Kui Zhu and Dr Brian N Leis
Abstract: EXPERIMENTAL DETERMINATION of fracture-toughness and fracture-resistance curves (J-R curves) is very important in pipeline integrity assessment. A cost-effective normalization method has been adopted in this paper to develop J-R curves for X80 pipeline steel directly from load versus load-line displacement records without the need for crack-length measurement, in conjunction with use of standard and non-standard single-edge notched bend (SENB) specimens. Standard SENB specimens with deep cracks generally contain high crack-tip constraint, while non-standard SENB specimens with shallow cracks involve low crack-tip constraint. To examine the constraint effect on fracture toughness, six SENB specimens with deep and shallow cracks for an X80 pipeline steel were tested according to ASTM standard E1820. The normalization method was then used to determine the constraint dependent J-R curves for these specimens.

To validate the experimental results obtained by the normalization method, the conventional elastic unloading compliance method was also employed to measure crack extension, and to determine the J-R curves for the X80 steel. Comparisons show that the J-R curves determined using the normalization method are in good agreement with those obtained by the elastic unloading compliance method for all the SENB specimens tested, except for those experiencing severe splitting. It is thus concluded that the normalization method can be used efficiently and cost-effectively to determine J-R curves for the X80 pipeline steel for standard as well as non-standard specimens. In calculation of the J-integral, the resistance-curve procedure, the basic procedure, and the modified basic procedure specified in ASTM E1820-05, were evaluated: the results demonstrate that the modified basic procedure can be equivalent to the resistance-curve procedure.

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