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    BEHAVIOUR OF BI-ADHESIVE IN DOUBLE-STRAP JOINT WITH EMBEDDED PATCH SUBJECTED TO BENDING
    (Sciendo, 2015) Temiz, Semsettin; Adin, Hamit; Sulu, Ismail Yasin
    In this study, behaviour of hi-adhesive used in the repair of damaged parts was analyzed, using the finite element method. In a double-strap joint with an embedded patch, patch is embedded into the adherents for structural requirements. In addition, to increase the strength of the joint, two adhesives are used to bond the adherents. This approach reduces stress concentration at the overlap ends, ad capacity and delays the failure. These effects give rise to strength. For this purpose, a stiff adhesive, FM73 produced by Cytec Fiberite. was applied in the middle portion of the overlap, while a softer adhesive, SBT9211 from 3M, was applied towards the edges, prone to stress concentrations. Non-linear finite element analyses were carried out to predict the failure loads, to assist with the geometric design and to identify effective ratios of sizes to maximize joint strength.
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    Experimental determination of the static and fatigue strength of the adhesive joints bonded by epoxy adhesive including different particles
    (Elsevier Sci Ltd, 2018) Sarac, Ismail; Adin, Hamit; Temiz, Semsettin
    Because of their many advantages, adhesively bonded joints are intensively used in many engineering fields. So, the mechanical research of the adhesively bonded joints is very important to use these joints safely. There are many studies performed by researchers to investigate the mechanical properties of the adhesive joints. There has been a considerable interest in nanoparticles added to structural adhesives recently because nanoparticles improve the mechanical properties of adhesives and joints. In this paper, different nanoparticles reinforced by epoxy adhesive, and neat adhesive were used to produce single lap joints. The static and fatigue strengths of single lap joints incorporating nanoparticles were compared to those without nanoparticles. Experiments were performed at 20 mm overlap length. DP460 epoxy was used as the adhesive material, and nano-Al2O3, nano-TiO2 and nano-SiO2 were used as the nanoparticles; and AISI 304 stainless steel plates were used as the adherents. The results of the experimental research revealed that average failure load increased significantly in nanoparticle-reinforced adhesive joints. The highest average failure load was obtained with 4 wt% nano-Al2O3 in epoxy adhesive. Fatigue tests were performed at 10 Hz frequency, and 0.1 loading ratio (R). When the fatigue test results were examined, it was observed that the addition of the nano-Al2O3 and nano-SiO2 to the adhesive increased fatigue strength of the adhesive joints, on the other hand, the addition of the nano-TiO2 to the adhesive reduced fatigue strength of the adhesive joints.
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    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 Sci Ltd, 2019) Sarac, Ismail; Adin, Hamit; Temiz, Semsettin
    In this study, single lap joints were formed by adding nano-Al2O3, nano-TiO2 and nano-Al2O3 powders in various proportions to the epoxy adhesive and using the additive-free epoxy adhesive; and also the mechanical properties of the connections were experimentally investigated at 20, 25, 30, 50 and 70 mm overlap lengths under shear load. In the experimental work, DP460 epoxy adhesive was used as adhesive and AISI 304 stainless steel plate as adherent material. When the results obtained from the experiments were examined, it was revealed that the average damage load in connection with the use of nanoparticle-added adhesives increased considerably in general. As a result of the experiments, the most effective nanoparticle in increasing the failure strength of the adhesive joints with nano-Al2O3 particles and the maximum failure strength increase rate was 20 mm in overlap length and 97% in 4 wt% nano-Al2O3 reinforced specimens. It was also found that the nanoparticle strain was an important parameter in the tensile strength of the adhesive joints. In addition, it has been found that the addition of nanoparticles into the adhesive increases the elongation of the joints. When the adhesion surfaces of the samples were examined as in the case of plain adhesives, damage was observed as adhesion separation while nanoparticle reinforcement was observed as a mixture of adhesion and cohesion.
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    Repair of an aluminum plate with an elliptical hole using a composite patch
    (Carl Hanser Verlag, 2018) Ergun, Rasit Koray; Adin, Hamit; Sisman, Abdullah; Temiz, Semsettin
    In 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.
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    A research on the fatigue strength of the single-lap joint joints bonded with nanoparticle-reinforced adhesive
    (Springer Heidelberg, 2021) Sarac, Ismail; Adin, Hamit; Temiz, Semsettin
    Nano-technological developments, which have made significant progress in recent years, have significant impact on the science of adhesives. Therefore, in our study, the static and fatigue strengths of single-lap joints (SLJs) incorporating nanoparticles were compared to those without nanoparticles. Steel plates were used in the adhesive joints. The results revealed that average damage load increased significantly in nanoparticle-reinforced adhesive joints. The highest damage load was obtained with 4 wt% nano-Al2O3 in epoxy adhesive. As the average damage load increased, the locus of damage changed from interfacial to the mixture of interfacial and cohesive. Also, fatigue strengths of the joints increased when the adhesive joint had nano-Al2O3 and nano-SiO2, and decreased when the adhesive joint had nano-TiO2.