SYMPOSIA PAPER Published: 01 December 1979
STP36037S

Moisture Diffusion Analysis of Microstructure Degradation in Graphite/Expoxy Composites

Source

Directional diffusion coefficients, that is, D1, D2, and D3, for the principal axis i = 1, 2, 3 of a unidirectional fibrous composite were determined by moisture absorption measurements. It was shown that the initial moisture absorption of a cured dry composite is non-Fickian and may relate to microstructural relaxation of internal stresses.

Moisture effusion rates of the specimens were also evaluated. Absorption-desorption kinetics over several cycles showed that there exists a damage mechnism in the composite which enhances moisture uptake from the dry state but does not enhance moisture release from the water-equilibrated state.

Author Information

Leung, CL
Rockwell International Science Center, Thousand Oaks, Calif
Dynes, PJ
Rockwell International Science Center, Thousand Oaks, Calif
Kaelble, DH
Rockwell International Science Center, Thousand Oaks, Calif
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Details
Developed by Committee: D30
Pages: 298–315
DOI: 10.1520/STP36037S
ISBN-EB: 978-0-8031-4761-4
ISBN-13: 978-0-8031-0527-0