The Effect of Moisture on Carbon Fiber Reinforced Epoxy Composites. 1. Diffusion
Technical rept. 1 Jul 1974-1 Jan 1976
NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD
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Mathematical models are suggested for calculating the reduced moisture diffusivities in unidirectional carbon fiber reinforced composites with hexagonal and tetragonal fiber alignment, parallel and perpendicular to the fiber direction, as a function of fiber volume fraction. The effective diffusion coefficients measured perpendicular to the fiber direction of 6 carbon fiber composites were determined as a function of temperature and relative humidity. The knowledge of the diffusion coefficients as a function of temperature, relative humidity, fiber volume fraction and composite geometry allow the prediction of the internal moisture distribution in a composite if the environment can be specified. A few simple examples have been illustrated.
- Laminates and Composite Materials