Mechanical Behavior of Nanodiamond/Epoxy Nanocomposites

Abstract

The mechanical properties of epoxy-based nanocomposites reinforced by nanodiamond (ND) particles were investigated. The results showed that while the addition of 0.1 wt% of ND improved the Young's modulus and tensile strength compared with those of the pure epoxy, the mode I fracture toughness did not show any improvement. Furthermore, in order to study the effect of shear deformation on fracture properties of nanocomposites, mixed mode fracture resistance of nanocomposites was investigated. It was found that as the share of shear deformation in mixed mode loading increases, the positive effect of ND particles enhances.

Mechanical performance of epoxy matrix hybrid nanocomposites containing carbon nanotubes and nanodiamonds

“…In contrast, reports are also available which show no significant effect upon tensile strength even after adding 1wt% MWCNTs [63]. NDs are reported to increase the tensile strength of epoxy matrix [12,48,56,59]; for example, a 52.7% increase in tensile strength was observed in a study by adding only 0.3wt% NDs [55]. Fig.…”

“…For example, the addition of 0.1wt% NDs in epoxy improved the modulus and tensile strength of the composites [12].…”

“…The interfacial interactions can be improved through functionalization of NDs before incorporating them as filler material in the polymers and significant efforts have been directed towards the establishment of chemical functionalities on the surface of NDs [11]. As a result, NDs have been incorporated in different types of thermo and thermosetting polymers to produce their composites [1, 10,12].…”

Nanodiamond–polymer composites

“…A study on the mode I and II fracture toughness of ND-epoxy composites has shown that, besides an improved Young's modulus and hardness, the mode II fracture toughness of epoxy-ND composites with 0.1 wt.% ND is increased. This is because ND is thought to hinder shear deformation, improving fracture toughness 67 .…”

Evaluation of surface properties of epoxy–nanodiamonds composites

“…Ayatollahi et al reported that while the addition of 0.1 wt% of ND improved the Young's modulus and tensile strength compared with those of the pure epoxy, the fracture toughness did not show any improvement. Mixed mode fracture resistance of nanocomposites was investigated, in order to study the effect of shear deformation on fracture properties of nanocomposites; results showed that as the share of shear deformation in mixed mode loading increases, the positive effect of ND particles enhances [23].…”