Accession Number : ADA306095

Title :   Development of Improved Graphite Fiber Composites.

Descriptive Note : Final rept. 14 Apr 72-11 May 73,

Corporate Author : PHILCO-FORD CORP NEWPORT BEACH CA

Personal Author(s) : Perry, John L. ; Damoth, Michael L. ; Pope, Jim P.

PDF Url : ADA306095

Report Date : 11 MAY 1973

Pagination or Media Count : 149

Abstract : In many applications of advanced graphite filament composites, the limiting factors in the component design are the transverse tensile, interlaminar shear, or impact properties. These factors restrict the potential use of advanced graphite filament composites in such areas as aircraft surface panels and components and fan blades for advanced air breathing turbine propulsion systems. Their potential use is restricted though other characteristics of the material are competitive or even advantageous over alternate material systems. It was the purpose of this program to explore potential avenues for maximization of these properties. Two technical areas were investigated: (1) Hybrid or Mixed Fiber Composites. (2) Fiber Surface Treatments. The first area involved the incorporation of third phase additives in the form of thin reinforcement plies in the composite itself. These reinforcing plies were selected to be of lightweight and of thin construction so they could be incorporated between plies or bundles of graphite filaments without causing significant reductions in graphite filament volume content. Also, investigations were carried out to determine if two relatively new materials, PRD-49, Type III, and Thornel 400 represented a potential for a more balanced combination of composite structural properties. The second area involved the use of boron and boron compounds as a graphite fiber surface treatment to improve interfacial (resin-fiber) bonding properties in the composites.

Descriptors :   *LAMINATES, *FIBER REINFORCED COMPOSITES, *GRAPHITE EPOXY COMPOSITES, STRESS STRAIN RELATIONS, LOAD DISTRIBUTION, TENSILE STRENGTH, FILAMENT WOUND CONSTRUCTION, DEGRADATION, STRUCTURAL PROPERTIES, STRUCTURAL ANALYSIS, TENSILE STRESS, SURFACE FINISHING, NYLON, COMPOSITE STRUCTURES, CARBON FIBERS, TOUGHNESS, MATRIX MATERIALS, FRACTURE(MECHANICS), HEAT TREATMENT, IMPACT STRENGTH, GLASS FIBERS, FLEXURAL STRENGTH, LIGHTWEIGHT, BORON, FAILURE(MECHANICS), COMPRESSIVE STRENGTH, CHARPY IMPACT TESTS, EPOXY RESINS, THERMAL STRESSES, DELAMINATION, AIRCRAFT PANELS, YARNS, SHEAR STRENGTH, ENERGY ABSORBERS, HYBRIDIZATION, PHOTOMICROGRAPHY.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE