STP768

    Environmental Effects on Graphite Fiber Reinforced PMR-15 Polyimide

    Published: Jan 1982


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    Abstract

    Studies were conducted to establish the effects of thermo-oxidative and hydrothermal exposure on the mechanical properties of T300 graphite fabric reinforced PMR-15 composites. The effects of hydrothermal exposure on the mechanical properties of HTS-2 continuous graphite fiber composites were also investigated. The thermo-oxidative stability characteristics of T300 fabric and T300 fabric/PMR-15 composites were determined. Flexural strengths of specimens from composites in the as-fabricated and environmentally exposed conditions were determined. The useful lifetime of T300 fabric/PMR-15 composites in air at 316°C was found to be about 100 h. The useful lifetimes in air at 228 and 260°C were determined to be 500 and 1000 h, respectively. Absorbed moisture was found to reduce the elevated temperature properties of both the T300 fabric and HTS-2 continuous fiber composites. The moisture effect was found to be reversible.

    Keywords:

    PMR-15 polyimide composites, graphite fabric, thermo-oxidative exposure, hydrothermal exposure, mechanical properties, composite materials


    Author Information:

    Serafini, TT
    Head, Polymer Matrix Composites and materials engineer, National Aeronautics and Space Administration, Lewis,

    Hanson, MP
    Head, Polymer Matrix Composites and materials engineer, National Aeronautics and Space Administration, Lewis,


    Paper ID: STP29349S

    Committee/Subcommittee: D30.08

    DOI: 10.1520/STP29349S


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