Sager, Ryan James (2008-05). A characterization of the interfacial and interlaminar properties of carbon nanotube modified carbon fiber/epoxy composites. Master's Thesis. Thesis uri icon


  • The mechanical characterization of the interfacial shear strength (IFSS) of carbon
    nanotube (CNT) coated carbon fibers and the interlaminar fracture toughness of woven fabric carbon fiber/epoxy composites toughened with CNT/epoxy interleave films
    is presented. The deposition of multiwalled carbon nanotubes (MWCNT) onto the
    surface of carbon fibers through thermal chemical vapor deposition (CVD) was used
    in an effort to produce a graded, multifunctional interphase region used to improve
    the interfacial strength between the matrix and the reinforcing fiber. Characterization of the IFSS was performed using the single-fiber fragmentation test. It is shown
    that the application of a MWCNT coating improves the interfacial shear strength between the coated fiber and matrix when compared with uncoated fibers. The effect
    of CNT/epoxy thin interleave films on the Mode I interlaminar fracture toughness of
    woven fabric carbon/epoxy composites is examined using the double-cantilever beam
    (DCB) test. Initiation fracture toughness, represented by critical strain energy release rate (GIC), is shown to improve over standard un-toughened composites using
    amine-functionalized CNT/epoxy thin films. Propagation fracture toughness is shown
    to remain unaffected using amine-functionalized CNT/epoxy thin films with respect
    to standard un-toughened composites.

publication date

  • May 2008