STP745

    Experimental Observation of Crack Velocity and Crack Front Shape Effects in Double-Torsion Fracture Mechanics Tests

    Published: Jan 1981


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    Abstract

    The double-torsion test configuration has been used to obtain crack growth information for a variety of materials. Recently critical reviews have suggested that certain assumptions used in the interpretation of double-torsion data are of questionable validity.

    This paper presents experimental data for crack growth in glass specimens loaded in the double-torsion test configuration. The constant displacement rate technique was used to propagate cracks and velocity was measured continuously by superimposing a tuned-frequency sonic signal during cracking. The crack velocity profile as a function of position along the crack front was determined. The crack velocity at the tensile surface was measured as a function of crack length at constant load and the crack front shape was observed for various crack lengths.

    Keywords:

    double torsion testing, fractography, glass fracture mechanics, crack propagation, composite materials


    Author Information:

    Michalske, TA
    Ceramic engineer, National Bureau of Standards, Washington, D.C.,

    Singh, M
    Mechanical engineer, Turbodyne Corp., Wellsville, N.Y.

    Frechette, VD
    Professor, N.Y.S. College of Ceramics, Alfred University, Alfred, N.Y.


    Paper ID: STP28294S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP28294S


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