STP1429

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

    Published: Jan 2004


      Format Pages Price  
    PDF Version (544K) 19 $25   ADD TO CART
    Complete Source PDF (4.6M) 19 $55   ADD TO CART


    Abstract

    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.

    Keywords:

    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,


    Paper ID: STP10660S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP10660S


    CrossRef ASTM International is a member of CrossRef.