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Summary
Recent investigations have shown that absorbed moisture lowers glass transition of epoxy resin more than indicated by currently accepted models. The resulting glass transition value limits supersonic service conditions. This limitation results because exceeding glass transition causes the ¿̐ưthermal spike effect¿̐ư and greatly reduces the strength of graphite-epoxy. These circumstances are reviewed and used to show the importance of realistically simulating airfield humidity and flight temperatures during testing. A new, economical approach is described for simulating realistic humidities for large structures.
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Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1978. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
