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Öğe Author Correction: Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water (Scientific Reports, (2021), 11, 1, (8353), 10.1038/s41598-021-87858-9)(Nature Research, 2021) Rizvi, M.; Gerengi, H.; Kaya, S.; Uygur, I.; Yıldız, M.; Sarıoglu, I.; Ibrahimi, B. E.An amendment to this paper has been published and can be accessed via a link at the top of the paper. © 2021, The Author(s).Öğe The Effect of Joining Process on Mechanical Properties of Structural Steels(Natl Acad Sciences Ukraine, Inst Metal Physics, 2010) Gülenç, Behçet; Uygur, I.; Tuncer, E.; Durgutlu, A.; Kap, T.; Uzunoğlu, M.Welding of structural steels is extensively used in various fields. In general, welding of these steels does not pose any problems. They may be welded with almost all well-known welding techniques. Different chemical contents of these steels and their joining methods may affect the mechanical properties and microstructure of the materials. In this study, AISI 1020-ASTM A514 steels have been welded by MMAW (MMAW manual metal arc welding), MIG (MIG-metal inert gas), MAG (MAG-metal arc gas) and TIG (TIG-tungsten inert gas) welding. Tensile tests, bending tests and hardness measurements have been carried out. The material microstructure has been investigated by means of optical microscopy in order to characterize the effect of processing parameters on the joints quality. The highest tensile strength and hardness values have been obtained for the MAG welded couples, while the lowest values have been obtained for the TIG welded materials. These changes have been explained with reference to the microstructure changes.Öğe Experimental Study on the Performance Characteristics of Non-asbestos Brake Pads Using a Novel Friction Testing Machine(Springer, 2021) Oktem, H.; Uygur, I.; Akincioglu, G.; Kurt, A.The friction, wear and mechanical properties of a new non-asbestos brake pad formulation called Premix were investigated. A novel friction-testing machine was utilized to determine tribological behavior. The tribological, physical and mechanical properties of the brake pads were measured and their friction surface morphology was explored via optical and scanning electron microscopy. Results showed that the Premix affected the friction coefficient. Moreover, it decreased the specific wear rate. The small value of friction coefficient is 0.566 at 90 degrees C whereas the small value of specific wear rate is 3.8 x 10(-8) cm(3)/N.m at 180 degrees C. Friction and wear results approximated those of commercial brake pads. It was concluded that the Premix played a crucial role in the tribological, physical and mechanical properties of the brake pads.Öğe Influence of particle sizes and volume fractions on fatigue crack growth rates of aerospace al-alloys composites(Polska Akad Nauk, Polish Acad Sciences, Inst Metall & Mater Sci Pas, 2024) Uygur, I.Recently, the need to develop fuel efficient transport systems has led to the development of a range of materials of low density, high stiffness and high strength each can be made at a reasonable cost. The aluminium based alloys are particularly important because of their improved mechanical, physical and technical properties. Fatigue failures have been recognised since the early days of the industrial revolution. Fatigue response of most of materials is related with the microstructural variations in the structure. Hence, in this study, influence of particle size and volume fractions on fatigue properties of Al-alloy composites was investigated. It was found that particle size and volume fraction of reinforcement particles play significant role on fatigue propagation rates, stress intensity threshold values, crack tip opening distance and crack tip plastic zone sizes.
