Moisture Diffusion Analysis of Microstructure Degradation in Graphite/Expoxy Composites

CL Leung; PJ Dynes; DH Kaelble

doi:10.1520/STP36037S

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

Moisture Diffusion Analysis of Microstructure Degradation in Graphite/Expoxy Composites

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