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Proposed updates to the buried-to-surface flaw characterization rules in the Annex E of BS 7910

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

Original languageEnglish
Title of host publicationProceedings of the ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering
DateAccepted/In press - 1 Apr 2019
DatePublished (current) - 14 Jun 2019

Abstract

BS 7910 “Guide to Methods for Assessing the Acceptability of Flaws in Metallic Structures” is undergoing revision for the 2019 edition. Updates are proposed for the Annex E flaw recharacterization guidance. The changes aim to make Annex E more applicable to real structures and to improve the synergy between the subcritical crack growth such as by fatigue and fracture of a buried flaw. Several studies were done by WEE/37 fracture panel focusing on brittle and ductile material behaviour to support the changes. These studies are summarised in the paper. The main modifications in the proposed updated Annex E are in:
• Removal of use of Annex E for brittle fracture.
• Updated guidance on recharacterized surface flaw length for ductile fracture.
• Guidance on use of geometry-based criterion for buried flaw break-through under ductile conditions.
• Synergy of fatigue crack growth in Section 8 with the flaw break-through in Annex E.

    Research areas

  • BS 7910, ductile fracture, brittle fracture, fatigue

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