Abstract
A theoretical model has been proposed for describing the influence of triple junctions of nanotubes on the strengthening of a nanocomposite. It has been assumed that the slip of nanotubes along the boundary with the matrix takes place via the nucleation and glide of prismatic dislocation loops enveloping the nanotubes. These loops are retarded by the triple junctions of nanotubes, which leads to a strengthening and increase in the fracture toughness (crack resistance) of the nanocomposite. It has been shown that, in order for the dislocation loop to overcome the triple junction, the shear stress acting on the loop should exceed a certain critical level. This critical stress increases as the radius and wall thickness of the nanotube decrease. The inference has been made that the triple junctions of thinnest nanotubes, such as single-walled carbon nanotubes, should lead to the greatest strengthening and to an increase in the crack resistance of these nanocomposites.
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Original Russian Text © M.Yu. Gutkin, I.A. Ovid’ko, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 7, pp. 1305–1310.
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Gutkin, M.Y., Ovid’ko, I.A. Effect of triple junctions of nanotubes on strengthening and fracture toughness of ceramic nanocomposites. Phys. Solid State 52, 1397–1403 (2010). https://doi.org/10.1134/S1063783410070127
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DOI: https://doi.org/10.1134/S1063783410070127