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Space structures concepts and materialsAn extension is preseted of the evaluation of graphite/aluminum metal matrix composites (MMC) for space structures application. A tubular DWG graphite/aluminum truss assembly was fabricated having the structural integrity and thermal stability needed for space application. DWG is a proprietary thin ply continuous graphite reinforced aluminum composite. The truss end fittings were constructed using the discontinuous ceramic particulate reinforced MMC DWAl 20 (trademark). Thermal stability was incorporated in the truss by utilizing high stiffness, negative coefficient of thermal expansion (CTE) P100 graphite fibers in a 6061 aluminum matrix, crossplied to provide minimized CTE in the assembled truss. Tube CTE was designed to be slightly negative to offset the effects of the end fitting and sleeve, CTE values of which are approx. 1/2 that of aluminum. In the design of the truss configuration, the CTE contribution of each component was evaluated to establish the component dimension and layup configuration required to provide a net zero CTE in the subassemblies which would then translate to a zero CTE for the entire truss bay produced.
Document ID
19900000812
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Nowitzky, A. M. (DWA Composite Specialities, Inc. Chatsworth, CA, United States)
Supan, E. C. (DWA Composite Specialities, Inc. Chatsworth, CA, United States)
Date Acquired
September 6, 2013
Publication Date
June 25, 1988
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
NASA-CR-183727
NAS 1.26:183727
Accession Number
90N10128
Funding Number(s)
CONTRACT_GRANT: SBIR-04.13-1504
CONTRACT_GRANT: NAS8-37257
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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