STP627

    Measurement of Fast Crack Growth in Metals and Nonmetals

    Published: Jan 1977


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    Abstract

    The use of a surface deposited resistance grid technique for crack velocity measurements and the extension of its general applicability to brittle solids by the incorporation of a circular time base for single shot, open shutter oscilloscope recording is described. For metal specimens a more direct crack velocity measurement procedure was used, and it was found that the dynamic potential drop across the faces of the propagating crack obeyed an equation of the form Vdynamic = A·v·c, where v is the crack velocity, c the crack length, and A an empirical constant. Crack velocity profiles for three-point-bend tests on polymethylethacrylate and a variously tempered tool steel are presented.

    Keywords:

    crack velocity, crack propagation, metals, nonmetals, bend tests, dynamics, fracture strength, fracture properties


    Author Information:

    Congleton, J
    Senior lecturer and senior research associate, University of Newcastle upon Tyne, Newcastle upon Tyne,

    Denton, BK
    Senior lecturer and senior research associate, University of Newcastle upon Tyne, Newcastle upon Tyne,


    Paper ID: STP27397S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP27397S


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