Toughening mechanisms in carbon nanotube-reinforced amorphous carbon matrix composites

Niu, J, Li, L, Xu, Q and Xia, Z 2013, 'Toughening mechanisms in carbon nanotube-reinforced amorphous carbon matrix composites', Computers, Materials and Continua, vol. 38, no. 1, pp. 31-41.


Document type: Journal Article
Collection: Journal Articles

Title Toughening mechanisms in carbon nanotube-reinforced amorphous carbon matrix composites
Author(s) Niu, J
Li, L
Xu, Q
Xia, Z
Year 2013
Journal name Computers, Materials and Continua
Volume number 38
Issue number 1
Start page 31
End page 41
Total pages 11
Publisher Tech Science Press
Abstract Crack deflection and penetration at the interface of multi-wall carbon nanotube/amorphous carbon composites were studied via molecular dynamics simulations. In-situ strength of double-wall nanotubes bridging a matrix crack was calculated under various interfacial conditions. The structure of the nanotube reinforcement-ideal multi-wall vs. multi-wall with interwall sp 3 bonding-influences the interfacial sliding and crack penetration. When the nanotube/matrix interface is strong, matrix crack penetrates the outermost layer of nanotubes but it deflects within the nanotubes with certain sp 3 interwall bond density, resulting in inner wall pullout. With increasing the sp 3 interwall bond density, the fracture mode becomes brittle; the fracture energy decrease while the bridging strength increases and then decreases. Our results suggest that the outermost nanotube wall can serve as a sacrificial layer such that the interface may be designed by effectively putting it inside the nanotubes. Controlling the density of sp 3 interwall bond within the multiwall carbon nanotube makes the transition from brittle to tough failure modes in the composites even when the matrix/nanotube interface is strong.
Subject Condensed Matter Modelling and Density Functional Theory
Composite and Hybrid Materials
Nanomaterials
Keyword(s) Ceramic matrix composites
Interfaces
Modeling
Toughening
Copyright notice Copyright © 2013 Tech Science Press.
ISSN 1546-2218
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