Accession Number : ADA305012

Title :   Resin/Graphite Fiber Composites.

Descriptive Note : Final rept. 18 Apr 72-18 Jun 73,

Corporate Author : TRW INC CLEVELAND OH

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

PDF Url : ADA305012

Report Date : 15 MAR 1974

Pagination or Media Count : 131

Abstract : During the course of the program, techniques were developed that provided thermo-oxidatively stable A-type polyimide/graphite fiber composites using the novel approach of in situ polymerization of monomeric reactants directly on reinforcing fibers, rather than employing separately prepared prepolymer varnish. This was accomplished by simply mixing methylene dianiline and two ester-acids and applying this solution to the fibers for subsequent molding. Five different formulated molecular weight resins were examined, and an optimized die molding procedure established for the 1500 formulated molecular weight system. Extensive ultrasonic inspection of composites was successfully utilized as a technique for monitoring laminate quality. Composite mechanical property studies were conducted with this polyimide resin at room temperature and after various time exposures in a thermo-oxidative environment at 561K (550F), 589K (600F) and 6l7K (650F). It was determined that such composites have a long term life in the temperature range of 561K to 585K. The final phase involved the fabrication and evaluation of a series of demonstration airfoil specimens. (AN)

Descriptors :   *FIBER REINFORCED COMPOSITES, *GRAPHITE EPOXY COMPOSITES, *POLYIMIDE RESINS, TENSILE STRENGTH, OPTIMIZATION, SOLUTIONS(MIXTURES), HIGH TEMPERATURE, LAMINATES, POLYMERIZATION, MOLECULAR WEIGHT, SYNTHESIS(CHEMISTRY), FABRICATION, THERMAL STABILITY, CARBON FIBERS, OXIDATION, THERMAL EXPANSION, FLEXURAL STRENGTH, GRAVIMETRIC ANALYSIS, MONOMERS, THERMAL STRESSES, ULTRASONIC TESTS, ANILINES, SHEAR STRENGTH, MOLDING TECHNIQUES.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE