Počet záznamů: 1  

Carbon nanotubes: do they toughen brittle matrices?

  1. 1. 0359267 - UFM-A 2012 RIV US eng J - Článek v odborném periodiku
    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
    Grant CEP: GA ČR GA101/09/1821
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: fracture toughness * carbon nanotube * silica glass
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika
    Impakt faktor: 2.015, rok: 2011

    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.
    Trvalý link: http://hdl.handle.net/11104/0197080