Tensile strength of carbon/carbon composites

Hiroshi Hatta, Tatsuji Aoi, Itaru Kawahara, Yasuo Kogo, Ichiro Shiota

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3 Citations (Scopus)


In order to identify ruling mechanisms of tensile fracture of Carbon/Carbon composites (C/Cs), tensile tests were carried out for various C/Cs as functions of the density, heat treatment temperature, and interfacial strength between fiber and matrix. Three processing routes of preformed yarn, resin char, and HIP processes were adopted to densify C/Cs. These C/Cs were finally heat-treated at temperatures from 2 273 K to 3 300 K. The interfacial strength between fiber and matrix was varied by the selection of processing routes. As a result, two ruling failure mechanisms were identified. At density lower than 1.6 g/cm3, the tensile fracture was controlled by stress transfer capability from the matrix to reinforcing fibers. However, at higher density than 1.6 g/cm3, tensile strength was primarily governed by the interfacial strength between the matrix and fibers. Thus the latter mechanism is nearly same as ceramic matrix composites.

Original languageEnglish
Pages (from-to)290-296
Number of pages7
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Issue number3
Publication statusPublished - 1 Jul 2003


  • Carbon/carbon composites
  • Heat treatment temperature
  • Hot isostatic press
  • Interfacial strength
  • Tensile strength

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