STP711

    Comparison of Crack Arrest Methodologies

    Published: Jan 1980


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    Abstract

    The ASTM Cooperative Test Program data are used to compare the static (KIa) and dynamic (KId, KIdm) approaches to crack arrest. It is shown that KIa is not dependent on KQ. This is consistent with the requirements of the static approach, but not the dynamic one, which requires that KIa decrease with KQ if KId (=KIdm) is a constant. KId increases systematically with KQ at a rate that is consistent with calculations based on the use of a constant value for KIa which is equal to its measured mean value. Only in the limiting case of very short crack jumps (associated with very-low-average crack speeds) can KId be identified as a minimum value at which KId = KIdm. In this case KIdmKIaKIm. The latter is the idealized minimum value of K that will support the continued propagation of a running crack.

    Keywords:

    fracture toughness, crack arrest, A533B-1 steel, running cracks


    Author Information:

    Crosley, PB
    Associate director of research and president, Materials Research Laboratory, Inc., Glenwood, Ill.

    Ripling, EJ
    Associate director of research and president, Materials Research Laboratory, Inc., Glenwood, Ill.


    Paper ID: STP27449S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP27449S


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