Yazar "Bayram, Ali" seçeneğine göre listele

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    High Pressure Resistant Aramid Fiber Reinforced Polymer Matrix Composite Pipe Design
    (Hacettepe Üniversitesi, 2022) Arı, Ali; Bayram, Ali
    In this study, a total of 6 different composites were obtained by adding 5%, 10% and 15% chopped aramid fiber reinforcement in 6 mm dimensions to each of the polypropylene and polyethylene matrix elements under the same production method and same conditions. The reinforcement and matrix materials were mixed using the extrusion method and then formed into plates by the press molding technique. Tensile and charpy tests of these composites were performed and their mechanical properties were examined. S/N ratios were calculated for the mechanical properties of the composites and the effect of matrix, fiber and additive ratios on mechanical properties was determined using analysis of variance (ANOVA). According to the Signal/Noise (S/N) ratios and ANOVA results, it was observed that the composites had different effects on the mechanical properties. Pipes are designed considering the mechanical properties of composite materials with 15% aramid fiber added to each matrix element. The composite pipe design to be pressure tested was designed in Solidworks program with a length of 500 mm according to ISO 1167 standards. Pipe dimensions with an outer diameter of 125mm, which are used as a standard in natural gas infrastructure works, are taken as reference.
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    Morphology, Microstructure and Mechanical Characterization of Inconel 718 Laser Cladding Application on AISI 1050 Steel
    (Bursa Uludağ University, 2023) Arı, Ali; Karagöz, Taner; Arslan, Orhun; Bayram, Ali
    Within the scope of this study, Laser Cladding of Inconel 718 powder was applied on AISI 1050 fabrication steel. During this process, to analyze the effect of dispersion on mechanical properties, an empirical study was carried out on the samples produced at the relevant parameters. The results show high deviations for breaking stress and ductility. This distribution is due to the presence of porosity in the deposited material. Also, the best results were obtained from the samples in the central region, while the tests performed on the samples from the outer regions showed lower values for breaking stress and ductility. In addition, when the hardness values were examined, it was seen that the heat-affected area was harder than the base material and this was due to the cooling rate of the heat-affected area. In addition, the Laves phase was found to be the main cause of the generation of micro-voids that lead to fracture over time.
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    PROJEKSİYON KAYNAĞIN PROSES PARAMETRELERİNİN S355MC KLEVİS BRAKETİN BAĞLANTI PERFORMANSINA ETKİSİ
    (Bursa Uludağ University, 2023) Arı, Ali; Korkmaz, Kübra; Mühürdar, Berk; Bayram, Ali
    Bu çalışma kapsamında, otomotiv sektöründe kullanılan amortisörün bağlantı ekipmanlarından biri olan klevis braketin üretiminde rol oynayan projeksiyon kaynak prosesinin iyileştirilmesi ve projeksiyon kaynak parametrelerinin klevis braketin mekanik performansını nasıl etkilediği araştırılmıştır. Bu kapsamda, 9 farklı proses kullanılarak numuneler üretilmiş ve bu numunelerin kopma testleri yapılmış ve elde edilen sonuçlara göre ANOVA analizi uygulanmıştır. Analiz sonucunda, en etkili parametrenin %80 oranında kaynak basıncı olduğu ve kaynak sıkma süresinin etkisinin ihmal edilebilecek düzeyde olduğu belirlenmiştir. Ayrıca, projeksiyon kaynağıyla yapılan 5 farklı noktanın en kritik 2 noktasının kesitlerinin makro ve mikro yapısı incelenmiştir. Kaynak süresinin artmasıyla birlikte ısıl girdinin arttığı ve bunun sonucunda mikro yapıdaki ısı tesirli alanların ve füzyon bölgesinin boyutlarının arttığı gözlemlenmiştir. Bununla birlikte, kaynak basıncının artması mikro yapıyı olumsuz yönde etkilemiştir. Ayrıca, kaynak kesitlerinin ortalama sertlik değerlerinin, bu mikro yapıdaki değişimden etkilendiği gözlenmiştir.