Accession Number : AD0908249

Title :   Graphite/Epoxy, Boron-Graphite/Epoxy Hybrid and Boron/Aluminum Design Allowables.

Descriptive Note : Techical rept. May 71-Jun 72,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE NY

Personal Author(s) : Cairo, Ronald P. ; Torczyner, Robert D.

Report Date : DEC 1972

Pagination or Media Count : 120

Abstract : The results of a study to develop a reliable set of design allowables for type AS GRAPHITE/EPOXY; A HYBRID CONSISTING OF 4.0 MIL BORON/EPOXY AND TYPE AS graphite/epoxy; and boron/aluminum at room temperature and 350 F are presented. Classic lamination theory, supported by testing, has been applied to the filamentary controlled (0/+ OR -45/90) degree family of graphite/epoxy and boron-graphite/epoxy hybrid laminates. The higher transverse layer strength and stiffness of boron/aluminum usually eliminates the need for transverse layers in typical structural applications, therefore the (0/+ or -45) degree family of boron/ aluminum laminates has been chosen for design property determination. Such properties as elastic modulus, shear modulus, in-plane uniaxial strength, in- plane shear strength, coefficients of thermal expansion and major Poisson's ratio have been developed. Equations are presented for laminate strength under the action of combined in-plane loading and for bolted joint behavior. Bonded and brazed joints of these materials are handled by the Grumman joint analysis computer program STPS4. (Author-PL)

Descriptors :   *BOX BEAMS), (*COMPOSITE MATERIALS, (*GRAPHITE, COMPOSITE MATERIALS), (*EPOXY RESINS, COMPOSITE MATERIALS), (*BORON, COMPOSITE MATERIALS), (*ALUMINUM ALLOYS, COMPOSITE MATERIALS), LAMINATES, FIBERS, FILAMENTS, REINFORCING MATERIALS, MECHANICAL PROPERTIES, TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, STRESSES, MODULUS OF ELASTICITY, THERMAL EXPANSION, BOLTED JOINTS, BONDED JOINTS, MATHEMATICAL MODELS, MATHEMATICAL PREDICTION, GRAPHICS, COMPUTER PROGRAMS, SHEAR STRESSES.

Subject Categories : Laminates and Composite Materials
      Couplers, Fasteners, and Joints
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE