Super-Duplex Stainless Steel: A Case Study of Incorporating Anisotropic Material Properties into Reliability Assessments

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Tubular components used in high-pressure, high-temperature (HT-HP) oil wells require materials with robust mechanical properties and high corrosion resistance to withstand the in-service conditions. A number of applications have made use of super-duplex stainless steel. The material has a highly
anisotropic microstructure and as a result its in-service performance depends on the orientation of the applied loading. This study examines the failure mode of ductile fracture from a pre-existing crack and the application of probabilistic structural reliability techniques to the problem. The material’s elastic-plastic fracture behaviour in two orientations is investigated using standard test specimens with differing crack depths. The results show that the measured Ji is geometery dependent and that SDSS has a higher crack resistance for radial flaws. The limit state function for the tangency condition of the R-curve for an axial flaw under hoop stress is developed, and the experimental results analysed to
quantify the crack resistance term. The results can be used to carry out an assessment of the probability
of tubular failure by ductile fracture.
Original languageEnglish
Title of host publicationProceedings of 3rd Asranet Colloquium
EditorsP Das
Number of pages16
Publication statusPublished - 10 Jul 2006


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