A Method for Measuring KIc at Very High Strain Rates

    Published: Jan 1973

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    A method for determining the plane-strain fracture-toughness KIc of a material at very high strain rates is described and demonstrated on a tough polycarbonate. Tritensile stresses were produced within several tenths of a microsecond in the interior of a small cylindrical specimen by flat-plate impact with a gas gun. A number of previously introduced internal cracks of known size distribution were propagated by the tensile stress resulting from the intersection of rarefaction waves; smaller cracks were not activated. A critical stress intensity factor was calculated from the value of the tensile stress and the critical crack size. The relationship of this value to the plane-strain fracture toughness associated with the artest of a running crack is discussed.


    fracture properties, mechanical properties, fracture tests, fracture toughness, crack propagation, stresses, strains, polycarbonate, loads (forces)

    Author Information:

    Shockey, D. A.
    Physicists, Stanford Research Institute, Menlo Park, Calif.

    Curran, D. R.
    Physicists, Stanford Research Institute, Menlo Park, Calif.

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP49647S

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