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    Some Nondestructive Tests for Filament-Wound Structures

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    Experimental results are given for several nondestructive tests designed to measure the resin to glass ratio, to measure thickness, and to locate voids. The measurement of back-scattered beta particles using a radioactive source show promise for monitoring the resin to glass ratio especially as an in-process control. Two methods of measuring the thickness of nonmetallic materials are discussed and the results of thickness measurements in the range from zero to 3 in. are given for an eddy current “lift-off” measurement method and for a capacitance measurement method. Both of these methods measure thickness from one side only but both require a metallic conductor on the other side. The “corona method” is described and its use for the detection of voids in resin-glass structures is discussed. Experimental results are given showing the size and location of voids which have been found.

    Author Information:

    Hendron, J. A.
    Aerojet-General Corp., Sacramento, Calif.

    Groble, K. K.
    Magnaflux Corp., Chicago, Ill.

    Gruetzmacher, R. W.
    Magnaflux Corp., Chicago, Ill.

    McClurg, G. O.
    Magnaflux Corp., Chicago, Ill.

    Retzky, M. W.
    Magnaflux Corp., Chicago, Ill.

    Committee/Subcommittee: D20.70

    DOI: 10.1520/STP44442S