STP627

    Characteristics of a Run-Arrest Segment of Crack Extension

    Published: Jan 1977


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    Abstract

    During a run-arrest segment of crack extension, the crack attains a high velocity shortly after initiating, and then decelerates in a continuous fashion to arrest.

    Strain measurements made during the event show that over the early portion of the jump when the crack velocity is high, the specimen behavior requires a dynamic analysis. During the later portions of the jump, when the velocity is low, the specimen behavior is described adequately by an analysis that assumes a condition of static equilibrium. Hence, if the dependence of a on K for the test material is described by a gamma (Γ) shaped curve, the crack arrest toughness, KIa, is an adequate description of KIm, the minimum toughness for stable crack extension.

    Keywords:

    crack propagation, steels, crack velocity, crack arrest, measurements, fracture properties


    Author Information:

    Crosley, PB
    Principal scientist and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.

    Ripling, EJ
    Principal scientist and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.


    Paper ID: STP27389S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27389S


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