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  • Brittle fracture from interacting surface breaking defects
    Bezenšek, Boštjan ; Hancock, John W.
    Pressure Vessel codes, such as ASME Section XI [8], define characterisation procedures for complex defects. The present work examines these approaches by studying the interaction of two coplanar ... surface breaking defects numerically and experimentaly. In the numerical study, the line-spring concept of Rice and Levy [12] was used to model a series of evolving crack profiles which develop in fatique from two adjacent semi-elliptical starter notches. The defects coalesced in fatique to form a single complex defect which initially has a marked re-entrant sector. Enhanced stress intensity factors were determined in the re-entrant sector of the coalesced defects and these were confirmed by experimental observations of rapid fatique crack growth.The Enhanced stress intensity factors were associated with a loss of crack tip constraint as parameterisized by T [11]. Experiment designed to measure th lower shelf toughness of defect configurations with re-entrant sectors were performed on a plain Carbon-Manganese steel. Three representative geometries with re-entrant sectors were considered. The low fracture resistance of profiles with pronounced re-entrant soctors leads to non-conservatism in the codified recharacterisation procedures of complex defects failing on the lower shelf.
    Source: Fracture and fitness : presented at the 2001 ASME Pressure Vessels and Piping Conference, Atlanta, Georgia, July 23-26, 2001 (Str. 25-31)
    Type of material - conference contribution
    Publish date - 2001
    Language - english
    COBISS.SI-ID - 7072022

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