Accession Number : AD0732489

Title :   Determination of Physical and Structural Properties of Mixed-Modulus Composite Materials.

Descriptive Note : Final rept.,

Corporate Author : BOEING CO PHILADELPHIA PA VERTOL DIV

Personal Author(s) : Pinckney,Robert L. ; Freeman,Richard B.

Report Date : JUN 1971

Pagination or Media Count : 75

Abstract : The objective of this program was to determine the physical and structuralproperties of mixed-modulus composite materials using combinations of graphiteand S-glass fibers with epoxy resin under static and fatigue loading conditions.The data obtained for solid laminates, tubular specimens and sandwich beamsin which the S-glass material was oriented parallel to the longitudinal axisof the specimens and the graphite fibers were oriented at plus or minus 45^to the same axis, are reported. Stress-strain and S-N CURVES ARE COMPARED TOAPPROPRIATE DATA ON PURE S-glass and pure graphite material where such datacontributes to an understanding of the mixed materials performance. The dataindicates that the mixed-modulus system is compatible with the structural andfailure mode requirements of helicopter rotor blades. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, PHYSICAL PROPERTIES), (*REINFORCING MATERIALS, MODULUS OF ELASTICITY), LAMINATES, CARBON FIBERS, GLASS TEXTILES, SANDWICH CONSTRUCTION, PIPES, FATIGUE(MECHANICS), CREEP, FAILURE(MECHANICS), ALIGNMENT, HELICOPTER ROTORS, ROTOR BLADES(ROTARY WINGS)

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE