Dr. Faramarz Ashenai Ghasemi Faramarz Ashenai Ghasemi officical site
Fazel Fatemi, Faramarz Ashenai Ghasemi*, Javad Beheshtian
Tabriz Journal of Mechanical Engineering, Volume 47, Issue 2, 2017(7), Pages 171-178. (ISC)
Abstract
In this study, the effect of grapheme and grapheneoxide on the mechanical properties of epoxy/Kevlar was investigated. Epoxy/Kevlar/grapheme and epoxy/Kevlar/graphene oxide nanocomposites were made as 4-layer nanocomposites with Kevlar fiber. Based on the results of tensile and bending test, addition of graphene and graphene oxide to epoxy/Kevlar increases the tensile modulus, tensile strength, flexural modulus and flexural strength. The optimum amount of graphene in the matrix was 0.5% by weight at which nanocomposites had the highest mechanical performance. In higher amounts of graphene and graphene oxide (more than 0.5% by weight), the excess amount of graphene leads to agglomeration of matrix which causes problems in transmission of the stress. Generally, the highest elastic modulus for graphene and graphene oxide corresponded to 1% by weight and the highest tensile strength of graphene and graphene oxide reported at5% by weight. The highest flexural modulus was observed at 1% by weight of graphene and graphene oxide. The highest flexural strength in both nanocomposites was found to be at 0.5% by weight. The morphology of the samples was characterized using SEM observations. Evaluation of SEM micrographs indicated that graphene and graphene oxide agglomerate at 1% by weight which results in a weak interaction and dispersion in.
Key Words
Mechanical properties; Nanocomposite; Graphene; Kevlar; Epoxy.