STP1321: 3-D Constraint Effects on Models for Transferability of Cleavage Fracture Toughness

    Dodds, RH
    Professor, Visiting Assistant Professor, and Graduate Research Assistant, University of Illinois, Urbana, IL

    Ruggieri, C
    Professor, Visiting Assistant Professor, and Graduate Research Assistant, University of Illinois, Urbana, IL

    Koppenhoefer, KC
    Professor, Visiting Assistant Professor, and Graduate Research Assistant, University of Illinois, Urbana, IL

    Pages: 19    Published: Jan 1997


    Abstract

    Since the late 1980s there has been renewed interest and progress in understanding the effects of constraint on transgranular cleavage in ferritic steels. Research efforts to characterize the complex interaction of crack tip separation processes with geometry, loading mode and material flow properties proceed along essentially two major lines of investigation: (1) multi-parameter descriptions of stationary crack-tip fields under large-scale yielding conditions, and (2) rational micromechanics models for the description of cleavage fracture which also reflect the observed scatter in the ductile-to-brittle transition (DBT) region. This article reviews the essential features of a specific example representing each approach: the J-Q extension to correlative fracture mechanics and a local approach based on the Weibull stress. Discussions focus on the growing body of 3-D numerical solutions for common fracture specimens which, in certain cases, prove significantly different from long-established plane-strain results.

    Keywords:

    fracture mechanics, constraint, cleavage, statistical effects, Weibull stress, scaling models, finite elements


    Paper ID: STP12308S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP12308S


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