STP627: Characteristics of a Run-Arrest Segment of Crack Extension

    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.

    Pages: 25    Published: Jan 1977


    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


    Paper ID: STP27389S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27389S


    CrossRef ASTM International is a member of CrossRef.