The Use of Nano-modified Epoxy Adhesive in Metallic Bonded Joints: Experimental Analysis
Elvis Carneiro Monteiro1; Aline Marques de Oliveira1; Viviane Cristina Munhoz1; Antonio Ferreira Ávila1
1 Universidade Federal de Minas Gerais
doi:10.20906/CPS/COB-2015-1573
Resumo
The use of bonded joints has presented significant progress in various industrial areas in recent decades. A good example is the aircraft industry, where in some aircraft models, bonded joints are extensively used due to cost and weight reduction. Based on this growing demand, and the fact that joints represent a critical point of structural fragility, several studies have been conducted in order to improve its performance. To be able to increase the bonded joints safety and overall load capacity two approaches can be used. The first one is based on bonded joint new design, which can be time consuming due to industry regulations. The second approach takes into consideration the materials' properties enhancement. The use of nanostructures and/or nanoparticles has been proved to be an efficient solution for materials' performance improvement. As discussed by Saito et al (2005), from the large variety of nanostructures available, the carbon based ones (graphene and CNTs) are the most promising due to its remarkable properties, i.e. high thermal conductivity, high charge carrier mobility and high specific stiffness and strength. The goal of this work is the experimental investigation of nano-modified adhesive. The epoxy adhesive system employed is the AR345 supply by Barracuda Advanced Composites. Two different carbon based nanostructures, multiwall carbon nanotubes and multi-layered graphene, are incorporated to epoxy adhesive system. To be able to disperse more efficiently the carbon based nanostructures two different surfactants will be employed, i.e. Sodium dodecylbenzene sulfonate (SDBS) and Polyoxiethelene nonylphenyl ether (IGEPAL CO890). Following Ávila et al (2015), the SDBS concentration is fixed into 200 ppm while the CO890 concentration is around 300 ppm. The MWNT and the graphene concentrations are fixed to 0 wt%, 0.15 wt%, and 0.30 wt%. In all cases, the dispersion process is based on sonication and high shear mixing. As this research deals with two different levels of analysis, i.e. the first one o
Palavras-chave: Composites; Nanocomposites; Polymers; Graphene; Carbon Nanotubes; Bonded Joints