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The objective of this research is the development of a methodology for the characterisation of the ductile tearing resistance of pipeline steels. Tests carried out under quasi static loading conditions have shown the effects of in-plane dimensions and the efficiency of different approaches (Sc, R-curves, local criteria). In particular, tests involving large crack propagation range are essential to the understanding of the real behaviour of the cracks in pipelines. For each crack propagation range, the parameters dJ/da, Sc, CTOA give an equivalent classification of the steels with respect to their ductile tearing resistance. The local criteria are likely to predict qualitatively the behaviour of the cracks for the first millimeters of propagation, by means of a simplified approach. Dynamic tearing tests were conducted under different loading rates. Although these tests did not give the crack speeds representative of pipe burst tests, perceptible changes have been observed in the ductile tearing of the steels. Mechanical results have been related to fractographic observations at each step of the research.

Additional information

Authors: INSTITUT DE RECHERCHES DE LA SIDÉRURGIE FRANÇAISE, Institut de Recherches de la Sidérurgie Française, Saint-Germain-en-Laye (FR);INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE, Institut de Recherches de la Siderurgie Francaise, Saint-Germain-en-Laye (FR)
Bibliographic Reference: EUR 12794 FR (1990) 89 pp., FS, ECU 8.75
Availability: (2)
ISBN: ISBN 92-826-1490-5
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