STP658: Some Anomalies Associated with Moisture Diffusion in Epoxy Matrix Composite Materials

    Whitney, JM
    Materials research engineer, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio

    Browning, CE
    Materials research engineer, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio

    Pages: 18    Published: Jan 1978


    Abstract

    Diffusion of moisture into graphite/epoxy composites was investigated and some anomalies observed. In particular, data are presented which indicate a departure from classical Fickian behavior. An apparent two-stage diffusion process is observed in both the neat epoxy resin and derived graphite/epoxy composites. Evidence is presented which suggests time-dependent matrix cracking as the mechanism associated with the two-stage diffusion process. Comparison of laminate diffusion data with unidirectional data suggests that the diffusion coefficient is stress dependent.

    Keywords:

    composite materials, graphite/epoxy, diffusion, diffusion coefficient, absorption, desorption


    Paper ID: STP34857S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP34857S


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