Effects of crack length and shape on the fracture toughness of a high strength steel 300m

Julia E. King*, J.F. Knott

*Corresponding author for this work

    Research output: Contribution to journalArticle

    Abstract

    The results of fracture toughness tests on a high strength steel 300m are presented. These results show (i) that in the presence of through-thickness cracks the toughness remains constant down to (a/W)-ratios as low as 0.01 and failure loads up to 0.85σy, and (ii) that the material is more resistant to crack growth when the cracks are semi-elliptical in shape, giving a toughness value which is almost 25 per cent higher than the through-thickness one. Three independent stress analyses are used to obtain stress intensity values for the semi-elliptical cracks and additional confirmation of the increase in toughness comes from stretch zone measurements.
    Original languageEnglish
    Pages (from-to)191-200
    Number of pages10
    JournalJournal of the Mechanics and Physics of Solids
    Volume28
    Issue number3-4
    DOIs
    Publication statusPublished - Aug 1980

    Keywords

    • steel

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