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    Constraint Correction of Fracture Toughness CTOD for Fracture Performance Evaluation of Structural Components

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    A correction of CTOD for constraint loss in large-scale yielding conditions is made on the basis of the Weibull stress fracture criterion, that eliminates an excessive conservatism in the conventional fracture assessment and material fracture toughness requirement. A CTOD ratio β = δ3P/ δWP (< 1) is proposed, where δWP is the CTOD of a wide plate component and δ3Pis an equivalent CTOD of the fracture toughness specimen at which the toughness specimen gives a compatible Weibull stress with the wide plate. The CTOD ratio β is decreased to a large extent after full yielding of the wide plate component, which is more significant for a high yield ratio YR and a deep surface crack in the wide plate. The Weibull modulus m exerts a marginal influence on β. A case study is presented on the application of the CTOD ratio β to the fracture performance assessment of full-scale column-to-beam connections subjected to cyclic and dynamic loading.


    brittle fracture, constraint effect, transferability analysis, fracture toughness, fracture performance, equivalent CTOD, Weibull stress criterion, structural steels

    Author Information:

    Minami, F
    Associate Professor, Graduate School of Engineering, Osaka University, Osaka,

    Arimochi, K
    General Manager, Sumitomo Metal Industries, LTD., Hyogo,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP10660S