Accession Number : ADA305565

Title :   Composite Impact Strength Improvement through a Fiber/Matrix Interphase.

Descriptive Note : Final rept.,

Corporate Author : TRW EQUIPMENT GROUP CLEVELAND OH

Personal Author(s) : Cavano, P. J. ; Winters, W. E.

PDF Url : ADA305565

Report Date : OCT 1975

Pagination or Media Count : 105

Abstract : The objective of the program was to improve the impact strength and toughness of fiber/resin composites by means of a fiber coating interphase. Graphite fiber/epoxy resin composites were fabricated with four different fiber coating systems introduced in a matrix-fiber interphase. Two graphite fibers, a high strength and a high modulus type, were studied with the following coating systems: chemical vapor deposited boron, electroless nickel, a polyamide-imide resin and a thermoplastic polysulfone resin. Evaluation methods included the following tests: Izod, flexure, shear fracture toughness, longitudinal and transverse tensile, and transverse and longitudinal compression. No desirable changes could be effected with the high strength fiber, but significant improvements in impact performance were observed with the polyamide-imide resin coated high modulus fiber with no loss in composite modulus. (AN)

Descriptors :   *FIBER REINFORCED COMPOSITES, *FRACTURE(MECHANICS), *IMPACT STRENGTH, *GRAPHITE EPOXY COMPOSITES, STRESS STRAIN RELATIONS, TENSILE STRENGTH, LAMINATES, IMPACT TESTS, STRESS TESTING, TENSILE STRESS, POLYAMIDE PLASTICS, MODULUS OF ELASTICITY, CHEMICAL VAPOR DEPOSITION, CARBON FIBERS, TOUGHNESS, MATRIX MATERIALS, HIGH STRENGTH, SHEAR STRESSES, FLEXURAL STRENGTH, BUCKLING, NICKEL, BORON, FAILURE(MECHANICS), COMPRESSIVE STRENGTH, EPOXY RESINS, ELECTROLESS PLATING, ELONGATION, DELAMINATION, SHEAR STRENGTH, EPOXY COATINGS, PLASTIC COATINGS, POLYIMIDE RESINS, POLYSULFONES.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE