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T300/5208 graphite-fiber-reinforced epoxy laminates were exposed to 33 different combinations of temperature and relative humidity. The diffusivities and equilibrium solubility for both nonpostcured and postcured laminates were determined at 21, 43, and 63°C (70, 110, and 145°F). Non-Fickian absorption anomalies were observed at five different relative humidities and water immersion for specimens at 82°C (180°F). Moisture diffusion was examined with respect to possible ply thickness, stress, and moisture concentration effects.
composite materials, moisture, absorption, diffusion, graphite/epoxy, laminates
Physical chemist, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio