Person: GÜLER ÖZGÜL, HANDE
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GÜLER ÖZGÜL
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HANDE
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Publication The joint properties of 5754 aluminium alloy by friction stir spot welding(Mdpi, 2019-03-01) Dedeoğlu, Orhan; Özgül, Hande Güler; GÜLER ÖZGÜL, HANDE; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi; GWU-9651-2022In this study, AA5754 sheet samples joined by using a friction stir spot welding method using di fferent rotational speed parameters has been analyzed experimentally. During the experiments, rotational speed of the tool was changed while other process parameters and the tool geometry were kept constant. The e ffect of tool rotational speed on the hardness values, macrostructure, and tensile properties of joints has been investigated and the results of the experiments show the best tensile shear strength and hardness values are obtained for the tool rotation speed of 1850 rpm. According to the macroscopic investigation, all of the fractured samples failed by nugget pullout and the fractured samples have only a single type fracture pattern.Publication Comparison of experimental and finite element analysis results of a sheet metal prototype vehicle door hinge in X, Y and Z directions(Univ Fed Rio de Janeiro, Lab Hidrogenio, 2021-01-01) Özgül, Hande Güler; Erol, Onur; GÜLER ÖZGÜL, HANDE; Erol, Onur; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü; 0000-0001-8589-6931; GWU-9651-2022; ETY-2762-2022In this study, the geometric differences which have a significant effect on the simulation results of the sheet metal prototype vehicle door hinge have been revealed. This geometric difference was examined by finite element simulations and experimental tests for the loads in the X, Y and Z directions specified in the UNECE R11 regulation.As a result, the curves of the finite element simulations and the experimental tests compared for each direction were examined and it was concluded that the compatible model with the experimental tests of the sheet metal prototype vehicle door hinge was 3D scan model.Publication Influence of the tool geometry and process parameters on the static strength and hardness of friction-stir spot-welded aluminium-alloy sheets(Materiali in Tehnologie, 2015-01-01) Güler, Hande; GÜLER ÖZGÜL, HANDE; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0001-8589-6931; GWU-9651-2022In this study, the effects of the tool geometry and welding parameters on the friction-stir spot-welding properties of AA 5754-H111 were studied. Two different tool-pin geometries were used and tensile shear tests were carried out to compare the weld strength. Hardness observations were also done. The optimum tool geometry for the mentioned material was determined as the circular pin tool and the tapered pin tool gave the lowest tensile shear load.Publication Investigation of the tool effect on the strength of friction stir spot welded aluminum specimens: A comparative study(Carl Hanser Verlag, 2015-03-01) Güler, Hande; GÜLER ÖZGÜL, HANDE; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0001-8589-6931; GWU-9651-2022Aluminum and its alloys are widely used in the automotive industry because of their light weight and good formability as well as malleability, and an alternative welding technique, the friction stir spot welding process, can be successfully used to join these materials. In this study, friction stir spot welding is applied to an AA 5754-H111 alloy to compare the effect of tool geometry and tool material on shear strength. Welds are made using different rotational speeds of tool and dwell times ranging from 500 to 1500 rpm and 6 s to 21 s, respectively. The experimental results showed that the combination of dwell time and rotational speed of tool as well as tool geometry and tool material have an important role in the strength of the joints. The total thickness and weld nugget diameter were also investigated in this study.Publication Effect of temperature and rolling direction on the formability of cp2 and ti-6al-4v titanium materials(Walter De Gruyter Gmbh, 2023-09-13) Gökmen, Şaban; Ertan, Rukiye; ERTAN, RUKİYE; Özgül, Hande Güler; GÜLER ÖZGÜL, HANDE; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; GWU-9651-2022; KIH-2391-2024Pure (CP2) and alloyed titanium (Ti-6Al-4V) have an important place in biomedical and aerospace applications due to their low density and high strength properties. In this study, the effect of the formability of CP2 and Ti-6Al-4V titanium alloy at different temperatures on mechanical properties and microstructure was investigated. The hot forming process was carried out by pressing 1 mm sheet titanium plates at different temperatures on the U profile mold. Specimens along the rolling direction and perpendicular to the rolling direction were taken from the bottom the formed U-plates. Afterward, tensile tests, microhardness measurements, and changes in microstructure were examined, respectively. As a result, at high temperatures and in different rolling directions, significant changes in microstructure and mechanical properties were observed. It was determined that the best forming temperature of CP2 and Ti-6Al-4V materials along the rolling direction was 500 degrees C, white it is 400 degrees for perpendicular to the rolling direction was 400 degrees C.