Accession Number : ADA305238

Title :   Multi-Fiber Composites.

Descriptive Note : Final contractor rept.,

Corporate Author : UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT

Personal Author(s) : Novak, R. C.

PDF Url : ADA305238

Report Date : APR 1976

Pagination or Media Count : 118

Abstract : The objective of this program is to develop resin matrix composites having improved resistance to foreign object damage in gas turbine engine fan blade applications. Materials evaluated include epoxy matrix graphite/glass and boron/glass hybrids, thermoplastic matrix boron/glass hybrids, and superhybrids consisting of graphite/epoxy, boron/aluminum, and titanium alloy sheets. Static, pendulum impact, and ballistic impact test results are reported for all materials. Superhybrid blade-like specimens are shown to be capable of withstanding relatively severe ballistic impacts from gelatin spheres without fracture. The effects of ply configuration and projectile angle of incidence on impact behavior are described. NASTRAN predictions of surface strains during ballistic impact are presented and shown to be in reasonable agreement with experimental measurements. (MM)

Descriptors :   *FIBER REINFORCED COMPOSITES, *IMPACT STRENGTH, *GAS TURBINES, *TERMINAL BALLISTICS, *EPOXY RESINS, *GRAPHITE EPOXY COMPOSITES, TENSILE STRENGTH, DAMAGE, COMPOSITE MATERIALS, PROJECTILES, IMPACT TESTS, GRAPHITE, METAL MATRIX COMPOSITES, MATRIX MATERIALS, STRAIN(MECHANICS), GLASS, FAN BLADES, SHEAR STRESSES, FLEXURAL STRENGTH, THERMOPLASTIC RESINS, HYBRID SYSTEMS, BORON, FAILURE(MECHANICS), GAS TURBINE BLADES, COMPRESSIVE STRENGTH, PLASTICS, DELAMINATION, TITANIUM ALLOYS, GELATINS, POLYSULFONES.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE