STP696

    Moisture Diffusion Analysis of Microstructure Degradation in Graphite/Expoxy Composites

    Published: Dec 1979


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    Abstract

    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.

    Keywords:

    composite materials, diffusion coefficients, hydrothermal aging, moisture profilometry, statistical estimation, nondestructive tests


    Author Information:

    Leung, CL
    Members of the technical staff and senior staff associate, Rockwell International Science Center, Thousand Oaks, Calif

    Dynes, PJ
    Members of the technical staff and senior staff associate, Rockwell International Science Center, Thousand Oaks, Calif

    Kaelble, DH
    Members of the technical staff and senior staff associate, Rockwell International Science Center, Thousand Oaks, Calif


    Paper ID: STP36037S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP36037S


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