Nanotube fracture during the failure of carbon nanotube/alumina composites

Investigation into the toughening mechanism of epoxy reinforced with multi-wall carbon nanotubes

“…CNT pull-out from the matrix and/or rupture may be another toughening mechanism. Transmission electron microscopy (TEM) observations and single nanotube pull-out tests have shown that CNTs break in the outer shells and then the inner core is subsequently pulled away rather than pulled out from the matrix; This leaves fragments of the outer shells in the matrix, which can be responsible for the higher fracture toughness (18). However, single nanotube pull-out experiment cannot characterise the role of CNT in crack propagation.…”

Carbon Nanotube Reinforced Alumina Composite Materials

“…Since no apparent variation in the diameter of the MWCNTs has been observed along the axis in the as-received MWCNTs, these results imply that some MWCNTs underwent failure in the sword-in-sheath manner prior to pullout from the matrix. Note that MWCNT failure was also observed in fracture surfaces of alumina composites made with arc-discharge-grown and chemical vapor deposition-grown MWCNTs prepared under the same processing conditions (Yamamoto et al, 2011). …”

Effect of Heat Treatment on Al2024 Reinforcement With Multiwalled Carbon Nanotube

“…The work on the hot pressing technique of Al-CNT composites by others recorded that moderate increases in electrical conductivity with an increased volume fraction of the CNTs [6]. However, controlled mechanical milling of Al-CNT showed a strong interfacial bonding between matrix and reinforcement [7] exhibiting the yield strength of 620MPa with 4.5 Vol% of MWCNT and uniform dispersion of MWCNT.…”