Experimental determination of the static and fatigue strength of adhesive joints bonded epoxy adhesive included Al2O3, TiO2 and SiO2 nanoparticles

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 and fatigue strengths of single lap shear joints incorporating Al2O3 , TiO2 and SiO2 nanoparticles 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 failure load was increased significantly nanoparticle-reinforced adhesive joints. The highest average faiure load was obtained with %4-Al2O3 in epoxy adhesive. As the average failure load increased, the locus of failure changed from interfacial to the mixture of interfacial and cohesive. Fatigue tests were performed at 10 Hz using an R-ratio of 0.1. From the tests, fatigue strengths of the adhesive joints increased when the adhesive of the adhesive joint had Al2O3 and SiO2 and decreased when the adhesive of the adhesive joint had TiO2.