Accession Number : ADA307218

Title :   Resin/Graphite Fiber Composites.

Descriptive Note : Contractor rept. (Final),

Corporate Author : TRW EQUIPMENT LABS CLEVELAND OH

Personal Author(s) : Cavano, P. J.

PDF Url : ADA307218

Report Date : 05 DEC 1974

Pagination or Media Count : 93

Abstract : Processing techniques were developed for the fabrication of both polyphenylquinoxaline and polyimide composites by the in situ polymerization of monomeric reactants directly on the graphite reinforcing fibers, rather than using previously prepared prepolymer varnishes. Void-free polyphenylquinoxaline composites were fabricated and evaluated for room and elevated flexure and shear properties. The technology of the polyimide system was advanced to the point where the material is ready for commercial exploitation. A reproducible processing cycle free of operator judgment factors was developed for fabrication of void-free composites exhibiting excellent mechanical properties and a long time isothermal life in the range of 288 deg C to 3l6 deg C. The effects of monomer reactant stoichiometry and process modification on resin flow were investigated. Demonstration of the utility and quality of this polyimide system was provided through the successful fabrication and evaluation of four complex high tip speed fan blades.

Descriptors :   *FIBER REINFORCED COMPOSITES, *FAN BLADES, *JET ENGINES, *POLYIMIDE RESINS, SHEAR PROPERTIES, MECHANICAL PROPERTIES, POLYMERS, LAMINATES, POLYMERIZATION, FABRICATION, COMPOSITE STRUCTURES, GRAPHITE, CARBON FIBERS, MONOMERS, FLEXURAL PROPERTIES, STOICHIOMETRY, REACTANTS(CHEMISTRY), VARNISHES, QUINOXALINES.

Subject Categories : Laminates and Composite Materials
      Plastics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE