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