Open Access Open Access  Restricted Access Subscription or Fee Access

Carbon Nanotubes Influence on Natural/Synthetic Hybrid Composites Mechanical Properties

NATHALIA MANEZES, FERNANDA LIMA, CAMILA SILVA, SUCHILLA LEAO, GUILHERME ARANTES, MARINA MARTINS and ANTONIO

Abstract


This investigation focuses on hybrid composites nano-modified by carbon nanotubes. Flax fibers were intercalated by E-glass fibers. The entire system is consolidated by a nanocomposite – multi-walled carbon nanotube (MWNT) dispersed into the epoxy resin. A failure mechanism change from brittle to ductile was observed into the fibreless specimens with MWNT during tension. The flax/epoxy specimens under tension presented a non-linear behavior. The stressstrain behavior returns to linear when the hybridization takes place. The hybrid composites failure mechanism, however, seems to be much more complex than the ones with E-glass or carbon fiber/epoxy. At the initial tensile stage the flax fibers waviness leads to an increase on stiffness, which can be observed at the initial part of the stress-strain curve. The decrease on stiffness for the second part of the non-linear curve could be explained by the inter-yarn interactions due to the friction between the now straight flax fibers, which can lead to a fiber/yarn debonding. The fiber/yarn debonding brings as consequence the failure at interface flax/epoxy. In the case of this research, the inter-ply interaction cannot be neglected, as it seems to be the final stage of the damage mechanism.

Full Text:

PDF