STP768: Environmental Effects on Graphite Fiber Reinforced PMR-15 Polyimide

    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,

    Pages: 15    Published: Jan 1982


    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


    Paper ID: STP29349S

    Committee/Subcommittee: D30.08

    DOI: 10.1520/STP29349S


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