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Mechanical and thermophysical properties of graphite/polyimide composite materialsAn on-going program to characterize advanced composites for up to 50,000 hours of exposure to simulated supersonic cruise environments is summarized. Results are presented for up to 25,000 hours of thermal exposure and 10,000 hours of flight simulation at temperatures up to 560K (550 F) with emphasis on HTS/710 graphite/polyimide composite material. Results to date indicate that the maximum use temperature for HTS/710 may be reduced to 505K (450 F) for long-time (1000 hours) application such as the supersonic transport. Preliminary thermophysical properties data for HTS/PMR15 graphite/polyimide were generated. These data include thermal conductivity, thermal expansion, and specific heat from 115K (-252 F) to 590K (600 F) and emittance at room temperature and 590K (600 F). The purpose in generating these data was to validate use of state-of-the-art property measurement methods for advanced graphite fiber reinforced resin matrix composites. Based on results to this point, thermal expansion measurements for composites are most difficult to perform. A high degree of caution in conducting thermal expansion tests and analyzing results is required to produce reliable data.
Document ID
19790022146
Document Type
Conference Paper
Authors
Rummler, D. R. (NASA Langley Research Center Hampton, VA, United States)
Clark, R. K. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1979
Publication Information
Publication: Graphite/Polyimide Composites
Subject Category
COMPOSITE MATERIALS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19790022126Analytic PrimaryGraphite/Polyimide Composites