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    “Instantaneous” Effect of Internal Moisture Conditions on Strength of Glass-Fiber-Reinforced Plastics

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    Glass-fiber-reinforced laminates composed of two different commercial epoxy resin matrix formulations, a “medium-temperature” system and a “high-temperature” system, were tested in tension after immersion in hot water. Tests were carried out both in the “as-is” wet condition and after drying. The internal moisture condition was found to have a significant effect on the tensile strength. Dried specimens of the medium-temperature resin were stronger than their wet counterparts. The reverse was the case with specimens based on the high-temperature resin.


    internal moisture, tensile strength, glass-fiber-reinforced plastics, epoxy resins, laminates, composite materials, hot water immersion

    Author Information:

    Ishai, O
    Professor, Technion-Israel Institute of Technology, Haifa,

    Arnon, U
    Advanced composites project engineer, Israel Aircraft Industries, Tel Aviv,

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP34869S