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Fatigue and fractureThe effects of the load/temperature environment of the shuttle on the fatigue life of the body-flap were investigated by conducting real time and accelerated flight-by-flight tests up to 500 flights on coupons containing holes. On the fracture side, much is known about the sensitivity of the tensile strengths of composites to holes and other flaws, predominantly at room temperature. The effects of notches were assessed for graphite/polyimides at the expected temperature extremes of the body-flap: 117K (-250 F) to 589K (600 F). Results indicate that the shuttle temperature extremes may affect fatigue properties HTS/PMR-15. There is no significant effect of temperature on notch-strength. Tensile strengths for specimens with holes and slots are equal.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Illg, W.
(NASA Langley Research Center Hampton, VA, United States)
Everett, R. A., Jr.
(Army Res. and Technol. Labs.)
Date Acquired
August 9, 2013
Publication Date
August 1, 1979
Publication Information
Publication: Graphite/Polyimide Composites
Subject Category
Composite Materials
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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