Graphite/epoxy, boron-graphite/epoxy hybrid and boron/aluminum design allowables. Techical report May 1971--June 1972

Technical Report · Fri Dec 01 04:00:00 EST 1972

OSTI ID:5284439

Cairo, R P; Torczyner, R D

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.

• Research Organization: Grumman Aerospace Corp., Bethpage, N.Y. (USA)
• OSTI ID: 5284439
• Report Number(s): AD-908249
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
ALLOYS
ALUMINIUM ALLOYS
BORON
CARBON
COMPOSITE MATERIALS
ELASTICITY
ELEMENTS
EPOXIDES
EXPANSION
GRAPHITE
HIGH TEMPERATURE
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SEMIMETALS
SHEAR PROPERTIES
STRESSES
TENSILE PROPERTIES
THERMAL EXPANSION