Fracture properties of an API X80 pipeline steel have been developed using a set of single edge notched bend (SENB) and single edge notched tension (SENT) specimens with shallow and deep cracks to generate different crack-tip constraint levels. The test data show that the - curves for the X80 pipeline steel are strongly constraint dependent. To facilitate transfer of the experimental - curves to those for actual cracked components, like flawed pipeline, constraint corrected - curves are developed. The two-parameter - formulation is adopted to quantify constraint effect on the crack-tip fields and the - curves. The constraint parameter is extracted by matching the - solution with finite element results for a specific crack configuration. A constraint corrected - curve is then formulated as a function of the constraint parameter and crack extension . A general method and procedure to transfer the experimental- curves from laboratory to actual cracked components are proposed. Using the test data of - curves for the SENB specimens, a mathematical expression representing a family of the - curves is constructed for the X80. It is shown that the predicted - curves developed in this paper agree well with experimental data for both SENB and SENT specimens. To demonstrate its application in assessing flaw instability, a pipeline with an axial surface crack is considered. For a crack depth of 50% of the wall thickness, the predicted - curve is found to be higher than that for the SENB specimen with the same crack length to width ratio. From this predicted - curve and crack driving force obtained by finite element analysis, the failure pressures of the pipeline at the crack initiation and instability are determined and discussed.
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November 2006
Research Papers
Application of Constraint Corrected - Curves to Fracture Analysis of Pipelines
Brian N. Leis
Brian N. Leis
Battelle Memorial Institute
, 505 King Avenue, Columbus, OH 43201
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Xian-Kui Zhu
Brian N. Leis
Battelle Memorial Institute
, 505 King Avenue, Columbus, OH 43201J. Pressure Vessel Technol. Nov 2006, 128(4): 581-589 (9 pages)
Published Online: December 6, 2005
Article history
Received:
July 26, 2005
Revised:
December 6, 2005
Citation
Zhu, X., and Leis, B. N. (December 6, 2005). "Application of Constraint Corrected - Curves to Fracture Analysis of Pipelines." ASME. J. Pressure Vessel Technol. November 2006; 128(4): 581–589. https://doi.org/10.1115/1.2349571
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