Graphite-Fiber Elastic Constants: Determination from Ultrasonic Measurements on Composite Materials

  • Subhendu Datta
  • Hassel Ledbetter
  • Tetsuyuki Kyono


We determined the complete five-component transverse-isotropic-symmetry elastic-constant tensor for two graphite fibers: high-strength/low-modulus and low-strength/high-modulus. We did this in two steps. First, we measured ultrasonically the complete elastic constants of a metal matrix with embedded uniaxial graphite fibers. Second, we did an inverse—modeling calculation to extract the fiber’s elastic constants. This calculation requires three inputs: composite elastic constants, matrix elastic constants, and fiber-matrix phase geometry, principally the fiber volume fraction. We compare the results with those expected for a random quasiisotropic graphite aggregate and for a hypothetical graphite fiber with perfectly aligned basal planes.


Elastic Constant Fiber Volume Fraction Graphite Fiber Magnesium Matrix Phenyl Salicylate 
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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • Subhendu Datta
    • 1
  • Hassel Ledbetter
    • 2
  • Tetsuyuki Kyono
    • 3
  1. 1.Department of Mechanical Engineering and CIRESUniversity of ColoradoBoulderUSA
  2. 2.Institute for Materials Science and EngineeringNational Institute of Standards and TechnologyBoulderUSA
  3. 3.Composite Materials LaboratoryToray IndustriesShigaJapan

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