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Öğe Analysis of polymeric composite materials for frictional wear resistance purposes(Sage Publications Ltd, 2021) Majeed, Badeea; Baştürk, SüleymanThis research is about manufacturing brake pads from a polymeric composite material composed of domestic materials, which are cheaper and available in the market. An unsaturated polyester is used as the basic material. Styrene-butadiene rubber and montmorillonite clay materials available in the market are used as the fillers. The Kevlar fibers, the nylon, and the steel fibers are used as reinforcing materials to improve the mechanical properties. The Shore hardness, compressibility, thermal conductivity, impact, and wear resistance tests have been implemented. The results show that the hardness, compressive, and impact resistance of the samples increase with the increase of the reinforcement ratio by Kevlar fibers, nylon fibers, and steel fibers. The rate of wear decreases with the increase of reinforcement ratio. The thermal conductivity decreases with an increase in the reinforcement ratio by Kevlar fibers and nylon fibers while the thermal conductivity increases with an increase in the reinforcement ratio by Kevlar fibers and steel fibers. Compared to the commercial brake pads, high strength, high wear resistance, high impact resistance, high hardness, high compressive strength, low thermal conductivity, and low-cost brake pads have been proposed.Öğe Bazalt/Ni, W/Ni, ve B/Ni fonksiyonel derecelendirilmiş kompozit plâkaların dinamik basınç yükü altındaki davranışlarının analizi(2019) Baştürk, SüleymanFonksiyonel Derecelendirilmiş Malzemeler (FDM) diğer ileri kompozit malzemelere göre günümüzde daha önemli bir yer tutmaktadır. Bu çalışmada, yüksek sıcaklık ve basınç uygulamalarında kullanılan bazalt, tungsten (W) ve bor (B) malzemeleri ile nikel (Ni) kullanılarak oluşturulan fonksiyonel derecelendirilmiş plâkaların ani basınç yükleri altındaki lineer olmayan dinamik davranışları modellenmiş ve detaylı analizleri yapılmıştır. Fonksiyonel derecelendirilmiş malzemelerin modellenmesi için Homojen Katmanlı Model (HKM) ve Sürekli Model (SM) yaklaşımları kullanılmıştır. Ani basınç yükü olarak ise Üstel Basınç Yükü Modeli uygulanmıştır. Yapılan detaylı analizler sonucunda W/Ni kompozit plâkaların daha düşük değerde genlik ve titreşim frekansı davranışı gösterdiği, bunun yanında farklı modelleme yöntemleri ve n parametresinin farklı değerlerinin de fonksiyonel derecelendirilmiş kompozit plâkaların dinamik davranışında etkili olduğu olduğu görülmüştür.Öğe Experimental investigation of drawbead effect on springback in profilee of double circular, rectangular and triangular bending sheet metal forming processes(Altınbaş Üniversitesi, 2021) Al-Wahab, Doa'a Abid; Baştürk, SüleymanSpringback is considered as one of the most common problems in metal forming processes, which poses an inaccuracy of product angle during assembling of parts. The estimation of the springback is difficult to predict for formed parts since it depends on many factors such as the mechanical properties, the sheet thickness, and the die angle. In this work, an experimental investigation of drawbead for different material thicknesses and the use of different lubricants such as grease, oil and wax have been studied and analyzed. Samples of aluminum specimens with 120 mm length, 30 mm width and thickness of 0.5, 0.7 and 0.8 mm were selected in this study. Design and manufacturing of double bending die with profile of Circular, Rectangular, and Triangular have been applied firstly without drawbead and then with drawbead. The results showed that in a given profile configuration, the springback reduced with existing the drawbead.Öğe Numerical study of heat transfer aspects in cutting tools made of Al2O3, ZrB2, TiB2, TiN using ANSYS fluent software(2022) Mohammed, Kamal; Baştürk, SüleymanIn this study, the effects of heat transfer and heat flux on cutting tools with materials of Al2O3, ZrB2, TiB2, TiN are investigated numerically by ANSYS fluent software. The numerical model was validated with the previous study. The influence of the machining parameters such as cutting speed and feed rate on the temperature and tool life has been investigated to indicate the optimum cutting tool and situation. The results show that Zirconium diboride (ZrB2) and Titanium diboride (TiB2) have a temperature less than the aluminum oxide (Al2O3) so that the productivity will increase with the diboride materials utilizing as cutting tool. The maximum temperature for aluminum oxide is 1300 K while the Titanium Nitrite achieved 1100 K. The lowest and maximum temperature was measured at a cutting speed of 180 m/min and 220 m/min, respectively. The optimum cutting condition has been obtained with TiN cutting tool material at 180 m/min cutting speed and 0.138 mm/ rev feed rate. Titanium diboride (TiB2) materials achieved the maximum cutting tool life comparing to other materials.Öğe Plazma borlamanın kesici takımların mikrosertliği üzerindeki etkisi(Altınbaş Üniversitesi, 2017) Baştürk, Süleyman; Erten, MuzafferSinterlenmiş karbürler talaşlı imalatta kesici uç olarak uzun yıllardan beri çok geniş bir şekilde kullanılmaktadır. Tungsten karbürler (WC) ise kesici uç imalinde en çok kullanılan malzemelerden biridir. Bu çalışmada, talaşlı imalatta oldukça yaygın bir şekilde kullanılan tungsten karbür kesme takımlarının plazma (iyon) borürlenmesi yapılarak bu işlemin kesici uçların yüzeyinde oluşturduğu tabakanın sertlik ölçümleri yapılmış ve sonuçlar değerlendirilmiştir. Plazma borlama işlemi, 700, 800, 900 ve 1000 o C’de, 1, 2 ve 4 saatlik sürelerle ve % 5 BF3 , %45 Argon, %50 H2 ’den oluşan gaz karışım oranında yapılmıştır. Plazma borlama sonrasında kesici uç kenar bölgesinde borür tabakası oluşmuş ve bu bölgenin sertlik ölçümleri yapılmıştır. Borlanmamış kesici ucun sertlik değeri 1210 HV iken, sertlik ölçümleri sonucunda, 1000 o C sıcaklıkta 1 saat süreyle yapılan borlama işlemi sonucunda 2882 HV sertlik değeri elde edilmiş olup borlanmamış numuneye göre sertlik değerinde 2.38 kat artış elde edilmiştir Bölgesel sertlik değerlerinde ise 3754 HV sertlik değerine kadar çıkılmış olup borlanmamış numuneye göre 3.1 kat artış elde edilmiştir Kesici ucun orta bölgesinde ise sertlik değerinin 600-1200 HV değeri aralığında değiştiği belirlenmiştir. Kesici ucun orta ve kenar bölgesindeki sertlik değerlerindeki bu farklılığın kırılma tokluğunu olumlu yönde arttıracağı değerlendirilmiştir. Optimum sıcaklık ve borlama süresi olarak 900 o C de 4 saatlik borlamanın optimum değer olabileceği belirlenmiştir.Öğe Static strength and harmonic vibration analysis of the spider crane by computational mechanics software(Altınbaş Üniversitesi, 2019) Sevdim, Tacetdin; Çalık, Orhan Koray; Baştürk, SüleymanIn this study, it is aimed to investigate and perform the static structural and natural frequency analysis of the mini spider crane which is designed to lift 0-500 kg load and 0-3 meters extend range, by using computational mechanics software. The crane works and driven by hydraulic system and in order to get the more realistic result, hydraulic cylinders modeled as springs instead of stiff rigid bodies in the analysis. This simulation approach provides a different method than the conventional method. Detailed analysis show that the spider crane statically can lift 1200 kg before the plastic region, so its safety factor is 2.4 when it is lifting 500 kg and its natural frequencies are 16.2 Hz and 50 Hz.Öğe The effect of different number of layers and fiber distribution on the performance of composite laminates(Journal of Physics: Conference Series, 2021) Mulaan, Najjm Abdalla; Mahmood, Amjed Saleh; Baştürk, SüleymanFiber-reinforced composites are widely used in world industries such as transportation vehicles, sports tools, space crafts, and more. This research investigates the influence of the number of layers and fiber distribution on the mechanical properties of woven fiber-reinforced composites by changing the number of layers or the manufacturing process. Hand lay-up and infusion processes are used to manufacture the composite plates. Three mechanical tests are conducted for all composite plates, such as Interlaminar shear stress (ILSS), ultimate tensile strength (UTS), and ultimate flexural strength (UFS). Furthermore, analyzing the microstructure of the laminates is conducted to evaluate fractal dimension (FD). It is observed that the distribution of the fibers measured by FD had an effective role in improving the mechanical properties. Also, the use of vacuum molds had an additional role in improving the mechanical properties. One could conclude that all the mechanical properties have proportional relationships with FD.Öğe The nonlinear dynamic response of functionally graded basalt/nickel composite plates(Taylor & Francis Inc, 2019) Baştürk, SüleymanTime dependent nonlinear dynamic response of new proposed plates made up of functionally graded (FG) basalt/nickel composites have been explored under different dynamic blast loadings. Four different approximations are considered to simulate the FG composite plates made up of basalt/nickel according to rules based on Homogenous-Laminated Model (HLM), Continuous Model (CM), Power-Law Model (PLM), and Sigmoid-Law Model (SLM). Large deflection theory of thin plates has been used to consider the geometric nonlinearity effects. The basalt/nickel FG composites under blast loads and extreme environments would be a good option and would find many application areas in the near future.
