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Mechanical Properties of Degraded PMR-15 ResinThermo-oxidative aging produces a non-uniform degradation state in PMR-15 resin. A surface layer, usually attributed to oxidative degradation, forms. This surface layer has different properties from the inner material. A set of material tests was designed to separate the properties of the oxidized surface layer from the properties of interior material. Test specimens were aged at 316 C in either air or nitrogen, for durations of up to 800 hours. The thickness of the oxidized surface layer in air aged specimens, and the shrinkage and Coefficient of Thermal Expansion (CTE) of nitrogen aged specimens were measured directly. Four-point-bend tests were performed to determine modulus of both the oxidized surface layer and the interior material. Bimaterial strip specimens consisting of oxidized surface material and unoxidized interior material were constructed and used to determine surface layer shrinkage and CTE. Results confirm that the surface layer and core materials have substantially different properties.
Document ID
19980231079
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Tsuji, Luis C. (Massachusetts Inst. of Tech. Cambridge, MA United States)
McManus, Hugh L. (Massachusetts Inst. of Tech. Cambridge, MA United States)
Bowles, Kenneth J. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1998
Subject Category
Composite Materials
Report/Patent Number
NASA/TM-1998-208487
E-11266
ASTM-STP-1357
NAS 1.15:208487
Funding Number(s)
PROJECT: RTOP 523-21-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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