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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
Professor, Technion-Israel Institute of Technology, Haifa,
Advanced composites project engineer, Israel Aircraft Industries, Tel Aviv,