Effect of Nanocomposite Powders on The Strength of Joints Bonded With Epoxy Adhesive Included Varied Proportions
There is a considerable interest nanoparticles added structural adhesives, recently. Because, nanoparticles improve the mechanical properties of an adhesive and its joint. In this paper, the static strengths of adhesive joints incorporating Al2O3 , TiO2 and SiO2 nanoparticles (2wt%, 4wt% and 6wt% proportions in the epoxy adhesive) were compared to those adhesive joints without nanoparticles. Experiments were performed 20, 25 and 30 mm overlap lengths, respectively. DP460 epoxy adhesive, Al2O3 , TiO2 and SiO2 nanoparticles and AISI 304 stainless steel plates were used for manufacturing the single lap adhesive joints. The results of the experimental research revealed that average shear failure load was increased significantly nanoparticle-reinforced adhesive joints. The highest shear strength was obtained with 4 wt % nano-Al2O3 in epoxy adhesive, being almost four times higher than that of the without nanoparticles. As the shear strength increased, the locus of failure changed from interfacial to the mixture of interfacial and cohesive.
Key words - Adhesive joints, single lap joints, nanoparticles, shear strength