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Öğe Repair of an aluminum plate with an elliptical hole using a composite patch(Carl Hanser Verlag, 2018-11-15) Ergün, Raşit Koray; Adin, Hamit; Şişman, Abdullah; Temiz, ŞemsettinIn this paper, the stress on axially loaded metal sheets with elliptical holes reinforced by a double-sided composite patch was analysed. The metal sheets with elliptical holes were subjected to axial loading, although no load was applied along the edges of the holes. The central elliptical holes on the metal plates had different diameters. The overlap distance of composite patches, which were adhesively bonded on each side, was of varied lengths. Elasto-plastic stress analyses were examined by means of the finite element method (FEM). The experimental results were compared with numerical results and a convergence rate of 92 % was achieved.Öğe Investigation of the effect of use of Nano-Al2O3, Nano-TiO2 and Nano-SiO2 powders on strength of single lap joints bonded with epoxy adhesive(Elsevier, 2019-06) Adin, Hamit; Temiz, Şemsettin; Saraç, İsmailIn this study, single lap joints were formed by adding nano-Al2O3, nano-TiO2and nano-Al2O3powders in variousproportions to the epoxy adhesive and using the additive-free epoxy adhesive; and also the mechanical prop-erties of the connections were experimentally investigated at 20, 25, 30, 50 and 70 mm overlap lengths undershear load. In the experimental work, DP460 epoxy adhesive was used as adhesive and AISI 304 stainless steelplate as adherent material. When the results obtained from the experiments were examined, it was revealed thatthe average damage load in connection with the use of nanoparticle-added adhesives increased considerably ingeneral. As a result of the experiments, the most effective nanoparticle in increasing the failure strength of theadhesive joints with nano-Al2O3particles and the maximum failure strength increase rate was 20 mm in overlaplength and 97% in 4 wt% nano-Al2O3reinforced specimens. It was also found that the nanoparticle strain was animportant parameter in the tensile strength of the adhesive joints. In addition, it has been found that the additionof nanoparticles into the adhesive increases the elongation of the joints. When the adhesion surfaces of thesamples were examined as in the case of plain adhesives, damage was observed as adhesion separation whilenanoparticle reinforcement was observed as a mixture of adhesion and cohesion.
