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    Effect of Normal Aging on Strength of Glass-Fiber Reinforced-Plastic Honeycomb Cores

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    The satisfactory service history of radomes made of reinforced-plastic materials obscures the fact that they suffer strength loss with age. Wide scatter in the scant test data available can be misleading, but such data can be made to yield significant information. They show, for example, that service life reduced the strength more than did shelf life. A method of simulating weather aging by exposure to 90 to 100 per cent relative humidity at 125 F for periods of one week to one month resulted in reasonably close duplication of in-service failures. Investigations of newly developed materials aged artificially indicate that their resistance to strength loss with aging is superior to that of older materials used in the failed radomes tested.

    Author Information:

    Marshall, A. C.
    General Sales Manager, Hexcel Products Inc., Berkeley, Calif.

    Committee/Subcommittee: D14.10

    DOI: 10.1520/STP46964S