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PRCI Report 183
- Ductile Fracture Properties of Selected Line-Pipe Steels
- Report / Survey by Pipeline Research Council International, 01/01/1990
- Publisher: PRCI
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L51604e
Battelle Memorial Institute
Need: Methods to characterize flaw growth in line pipe have evolved with the materials used in pipelines and the technology used to analyze flaw growth. Developments in steel processing and pipeline manufacture have given rise to steels that are very flaw tolerant. Recent steels sustain significant stable flaw growth accompanied by local inelastic straining prior to unstable crack growth. The need for an analysis that can account for the stable flaw growth and inelastic straining in line-pipe applications was recognized and the PRCI Line Pipe Research Supervisory Committee initiated a combined analytical and experimental program to assess the effects of stable flaw growth during hydrotesting.
Benefit: The objective of this report is to present the ductile fracture properties needed to assess stable flaw growth. These properties are presented following a brief discussion of the analysis method being developed to provide the gas industry with an accurate and validated model for predicting growth of a flaw due to the effects of a hydrostatic test or hydrostatic retesting. The end product will be a validated model that predicts crack extension during the load and hold portion of a hydrotest, and subsequent operation.
Result: Test methods to develop these properties are presented along with discussion of data analysis. Results are presented for three line-pipe steels for the LT (through-wall axial flaw) orientation, for three levels of prestrain. The results show a strong dependence of JIc on prestrain with initiation resistance decreasing as prestrain increases. Initiation resistance also was shown to increase with increasing flow stress, sf . In contrast, tearing resistance was not uniquely dependent on flow stress and was independent of prior prestrain.
Battelle Memorial Institute
Need: Methods to characterize flaw growth in line pipe have evolved with the materials used in pipelines and the technology used to analyze flaw growth. Developments in steel processing and pipeline manufacture have given rise to steels that are very flaw tolerant. Recent steels sustain significant stable flaw growth accompanied by local inelastic straining prior to unstable crack growth. The need for an analysis that can account for the stable flaw growth and inelastic straining in line-pipe applications was recognized and the PRCI Line Pipe Research Supervisory Committee initiated a combined analytical and experimental program to assess the effects of stable flaw growth during hydrotesting.
Benefit: The objective of this report is to present the ductile fracture properties needed to assess stable flaw growth. These properties are presented following a brief discussion of the analysis method being developed to provide the gas industry with an accurate and validated model for predicting growth of a flaw due to the effects of a hydrostatic test or hydrostatic retesting. The end product will be a validated model that predicts crack extension during the load and hold portion of a hydrotest, and subsequent operation.
Result: Test methods to develop these properties are presented along with discussion of data analysis. Results are presented for three line-pipe steels for the LT (through-wall axial flaw) orientation, for three levels of prestrain. The results show a strong dependence of JIc on prestrain with initiation resistance decreasing as prestrain increases. Initiation resistance also was shown to increase with increasing flow stress, sf . In contrast, tearing resistance was not uniquely dependent on flow stress and was independent of prior prestrain.
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