Accession Number : ADA307090

Title :   Large-Diameter Carbon-Composite Monofilaments.

Descriptive Note : Contractor rept. (Final),

Corporate Author : LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB

Personal Author(s) : Bradshaw, W. G. ; Pinoli, P. C. ; Karlak, R. F.

PDF Url : ADA307090

Report Date : 01 MAY 1974

Pagination or Media Count : 119

Abstract : Large-diameter carbon composite monofilaments with high strength and high modulus were produced by pregging multifiber carbon bundles with suitable organic resins and pyrolysing them together. Two approaches were developed to increase the utilization of fiber tensile strength by minimizing stress concentration defects induced by dissimilar shrinkage during pyrolysis. These were matrix modification to improve char yield and strain-to-failure and fiber-matrix copyrolysis to alleviate matrix cracking. Highest tensile strength and modulus were obtained by heat treatments to 2873 deg. K to match fiber and matrix strain-to-failure and develop maximum monofilament tensile-strength and elastic modulus.

Descriptors :   *FIBER REINFORCED COMPOSITES, *PLASTICS, *CARBON REINFORCED COMPOSITES, STRESS STRAIN RELATIONS, AIR BREATHING ENGINES, TENSILE STRENGTH, POLYMERS, CRACKING(FRACTURING), MODULUS OF ELASTICITY, METAL MATRIX COMPOSITES, CARBON FIBERS, MATRIX MATERIALS, STRAIN(MECHANICS), HEAT TREATMENT, DEFECTS(MATERIALS), HIGH STRENGTH, FILAMENTS, YIELD STRENGTH, FAILURE(MECHANICS), EPOXY RESINS, THERMOSETTING PLASTICS, SHRINKAGE, PHENOLIC PLASTICS, STRESS CONCENTRATION, CHARRING, BUNDLES.

Subject Categories : Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE