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Publication - Dr Harry Coules

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

    Citation

    Bezensek, B, Coules, H, Sharples, J & Tkach, Y, 2019, ‘Proposed updates to the buried-to-surface flaw characterization rules in the Annex E of BS 7910’. in: Proceedings of the ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering.

    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.

    Full details in the University publications repository