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  • NONMETALLIC MATERIALS  (2)
  • 1
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    Absorbed dose thresholds and absorbed dose rate limitations for studies of electron radiation effects on polyetherimides (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The threshold values of total absorbed dose for causing changes in tensile properties of a polyetherimide film and the limitations of the absorbed dose rate for accelerated-exposure evaluation of the effects of electron radiation in geosynchronous orbit were studied. Total absorbed doses from 1 kGy to 100 MGy and absorbed dose rates from 0.01 MGy/hr to 100 MGy/hr were investigated, where 1 Gy equals 100 rads. Total doses less than 2.5 MGy did not significantly change the tensile properties of the film whereas doses higher than 2.5 MGy significantly reduced elongation-to-failure. There was no measurable effect of the dose rate on the tensile properties for accelerated electron exposures.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-2928 , L-16585 , NAS 1.60:2928
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The effects of fluids in the aircraft environment on a polyetherimide (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Fluid absorption studies have been made for a polyetherimide thermoplastic film and a unidirectional composite of the thermoplastic with graphite fibers immersed in water. JP4 jet fuel, ethylene glycol, and hydraulic fluid. The changes in the weight, thickness, and tensile properties were measured for the film. The changes in the flexural properties of the composite were measured for specimens whose fiber orientation was transverse to their length. Only the hydraulic fluid, which caused an erosion or dissolving of the resin at the specimen surface, affected the film's properties. Both the water and the hydraulic fluid affected the flexural properties of the composite, due to capillary absorption along the fiber-resin interface.
    Keywords: NONMETALLIC MATERIALS
    Type: Polymer Engineering and Science (ISSN 0032-3888); 28; 12 J
    Format: text
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    NASA TECHNICAL REPORTS
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