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Carbon nanotubes: do they toughen brittle matrices?

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    0359267 - ÚFM 2012 RIV US eng J - Journal Article
    Chao, J. - Inam, F. - Reece, M.J. - Chlup, Zdeněk - Dlouhý, Ivo - Shaffer, M.S.P. - Boccaccini, A. R.
    Carbon nanotubes: do they toughen brittle matrices?
    Journal of Materials Science. Roč. 46, č. 14 (2011), s. 4770-4779. ISSN 0022-2461. E-ISSN 1573-4803
    R&D Projects: GA ČR GA101/09/1821
    Institutional research plan: CEZ:AV0Z20410507
    Keywords : fracture toughness * carbon nanotube * silica glass
    Subject RIV: JL - Materials Fatigue, Friction Mechanics
    Impact factor: 2.015, year: 2011
    http://www.springerlink.com/content/74106l0458326n91/

    The development of a model CNT-brittle matrix composite system, based on SiO2 glass containing well-dispersed CNTs at up to 15 wt%, allows a direkt assessment of the effect of the nanoscale filler on fracture toughness (KIC). Samples were prepared by colloidal heterocoagulation followed by spark plasma sintering. Detailed KIC easurements, using both indentation and notched beam techniques, show a linear improvement with CNT content, with up to a twofold increase of fracture toughness at maximum loading. The results from the two methods used in this study show equivalent trends but differing absolute values; the relative merits of these two approaches to measuring nanocomposite toughness are compared. Possible toughening mechanisms associated with CNT pull-out, crack bridging, and crack deflection are identified, and discussed quantitatively, drawing on conventional short-fibre composite theory and the potential effects of scaling fibre diameter.
    Permanent Link: http://hdl.handle.net/11104/0197080

     
     
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