Person: ERTAN, RUKİYE
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ERTAN
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RUKİYE
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Publication The investigation of the effects of spray parameters on the thermal and mechanical properties of 22MnB5 steel during hybrid quenching process(Begell House, 2021-01-01) Sevilgen, Gökhan; Ertan, Rukiye; Bulut, Emre; Öztürk, Ferruh; Eşiyok, Ferdi; Abi, Tuğçe Turan; Alyay, İlhan; SEVİLGEN, GÖKHAN; ERTAN, RUKİYE; BULUT, EMRE; ÖZTÜRK, FERRUH; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-7746-2014; 0000-0001-9159-5000; ABG-3444-2020; KIH-2391-2024; AAG-8907-2021; JIW-7185-2023In this paper, the investigation of the effects of spray parameters on the thermal and mechanical properties of 22MnB5 steel during the hybrid quenching (HQ) process was performed. The HQ method presented in this study includes early removal of hot-stamped parts from the die and transfer to an external multinozzle spray cooling device. The proposed method was developed due to the need for improving disadvantages of the traditional hot stamping process such as complexity of controlling the cooling rate during die quenching by using cooling channels and of providing the reduced tool contact surface temperature after a certain cycle of the hot stamping process. This paper focuses on the temperature distribution and mechanical characteristics of high-strength 22MnB5 steel during the HQ process. Moreover, the methodology developed in this paper can be used to get tailored parts where the cooling rates are locally chosen to achieve structures with graded properties, i.e., to allow local modification of final mechanical properties in order to provide high energy absorption to enhance the crashworthiness of the whole component and thus to improve the vehicle safety performance. The three-dimensional numerical model of spray cooling was also developed by using the computational fluid dynamics (CFD) method to get the suitable process parameters such as spray height and initial blank temperature and to present the detailed heat transfer analysis of hot-stamped parts during the hybrid quenching process.Publication Effect of deformation temperature on mechanical properties, microstructure, and springback of Ti-6Al-4V sheets(Consejo Superior Investigaciones Cientificas-csic, 2021-10-01) Ertan, Rukiye; Çetin, Güner; ERTAN, RUKİYE; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü; KIH-2391-2024Ti-6Al-4V titanium alloy is applied in various industrial applications such as aerospace, jet engine, and automotive industries due to its strength-to-weight ratio and excellent high-temperature properties. For these demanding applications, the formability of the material and the effect of forming parameters on the final mechanical properties are of great importance. In this study, the springback behavior of hot-formed 1 mm sheet Ti-6Al-4V alloy was investigated related to the deformation temperature ranging from 350 to 950 degrees C. After the hot forming, the springback angles of the U profile were examined and associated with the mechanical properties and the microstructural evolution. The microstructure changing mechanisms were mapped at each temperature of deformed sheets with the help of optical microscopy. As a result, it was observed that important microstructural changes have occurred, such as recrystallization, grain growth, and phase transformations, which themselves greatly influence the springback angle and the mechanical properties. The formability of the Ti-6Al-4V sheet material was found to be strongly dependent on the applied process temperatures and the activated microstructural deformation mechanisms. Hot forming at 850 degrees C leads to the lowest springback angle, but after the hot-forming, pronounced softening of the material occurs due to the recrystallization.Publication Investigation of the welding capability of aluminum and titanium alloy sheets with if steel sheets by resistance spot welding method(Gazi Üniversitesi, 2020-12-01) Mutlusu, Özer; Ertan, Rukiye; ERTAN, RUKİYE; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi; KIH-2391-2024In this study, spot weldability of 1 mm thick IF 180 deep drawn high strength steel with 1 mm thick commercial pure titanium (ASTM Grade 2) and 5754 aluminum alloy was investigated. The welding operations were performed with different welding currents (10 kA, 12.5 kA and 15 kA), welding times (10, 15 and 20 cycles) and electrode forces (5 kN, 10 kN and 15 kN) by electrical resistance spot welding. The welding nugget diameter, electrode immersion depth, hardness and tensile-shear test results of the welded samples were examined and the mechanical properties were compared. As a result of the tests, it was seen that the welding parameters had a greater effect on the mechanical properties of the IF 180-5754 Al alloy welding pair than the IF 180 - Ti-Gr2 alloy pair. It has been determined that the welding current and electrode force significantly affect the nugget diameter, electrode immersion depth and the maximum tensile force in both welding pairs.Publication The flexural behavior of the epoxy and polyester based composite sandwich structures at subzero temperatures(Elsevier, 2020-08-01) Ertan, Rukiye; Kuş, Abdil; Durgun, İsmail; ERTAN, RUKİYE; KUŞ, ABDİL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi,/Otomotiv Mühendisliği Bölümü; AAG-9412-2021; KIH-2391-2024The present work aims at characterizing the 3D woven spacer composites with carbon fiber reinforced polymer face-sheets under the 3-point flexural test at subzero temperature conditions. For this purpose, sandwich composite panels are manufactured using vacuum assisted resin infusion method for epoxy and polyester matrix materials with 2, 3, and 4 layered face-sheets. The 3-point flexural test was performed for warp and weft direction on liquid nitrogen temperature (-40 degrees C). Macroscopic fracture morphology was examined to understand the deformation and failure mechanism. The results show that the flexural properties were significantly affected by the number of face-sheets and then from matrix material and finally from the composite direction at subzero temperatures.