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Cite this document
Mechanical properties testing of a graphite/polyimide (Celion 3000/PMR-15) fabric was performed in primarily four environments: -54°C (-65°F) as fabricated, room temperature as fabricated, 204°C (400°F) after moisture conditioning, and 316°C (600°F) after moisture conditioning. Specimens that had been moisture conditioned before testing were considered “wet.” To accomplish this hot/wet testing, special strain-gaging techniques were developed to improve strain measurement in the severe environments. Heating techniques were also developed to heat the specimens quickly to retain sufficient moisture at the time of failure. This test program demonstrated that moisture, temperature, and specimen geometry can each dramatically affect test results. The program also demonstrated the need for industry standards for hightemperature testing and moisture level requirements. Without such standards, data thought to be hot/wet test data may actually be hot/dry test data. Such a discrepancy appears to have significant ramifications according to this program's test results.
composite materials, graphite-polyimide composites, mechanical properties, moisture content, high temperature tests, strain gages
Senior materials and processes engineer, LTV Aircraft Products Group, Dallas, TX