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Öğe Investigation of The Effects of Twist Angle On Wing Performance and Stall Characteristics In Low-Speed Wings(BZT Akademi Yayınevi, 2023) Kuzey, Erkan; Tangöz, SelimOne of the most notable features expected from the wings used in airplanes is that they allow an economical flight. In addition, wings must contribute to the provision of a safe flight in terms of their structural features. Therefore, studies on improving the performance of wings are increasing day by day. In these studies, performance analysis is carried out by changing the incidence angle from the root to the tip without changing the airfoil structure of the wing. However, it has been observed that the effect of the twist angle on the performance and flow separations of the wings used in low-speed aircraft has not been sufficiently examined or the research have not been compiled in a regular format. It is known that changing the angle of incidence along the wing, that is, twist of the wing, increases the lift stability along the wing and improves the stall characteristics of the wing. In this review, for the reasons, it is aimed to investigate the effects of twist angle on wing performance, flow separation and stall characteristics of wings used in low-speed aircraft.Öğe The Effect of Reinforcement Ratio on Mechanical Properties of AA2024 Matrix MgO+SiC Reinforced Hybrid Composites(ICAT'19, 2019) Pul, Muharrem; Katmer, Şükran; Şeker, Ulvi—In today's rapidly developing technologies, the place and importance of composite materials is gradually increasing and the studies carried out in these fields are continuing rapidly. While metal matrix composite materials form part of these studies, especially the applications of ceramic particle reinforced aluminium composites are expanding. Generally, different types and amounts of SiC, B4C, SiO2, Al2O3, TiC, MgO, TiB, etc. are added into the aluminium alloys of different quality ceramic reinforcement materials are added. However, composite materials are generally produced by using a variety of these reinforcing materials and are subject to scientific studies. In this experimental study; two different ceramic-based reinforcing materials, SiC and MgO, were mixed equally and then hybrid composite materials were produced with 3%, 6% and 12% (weight) reinforcements in 2024 quality aluminium alloy by vortex method. Density, hardness, transverse fracture and abrasive wear tests were carried out and as well as the microstructures of the composite materials were examined. According to the results, the porosity in the composite structure increased and the density decreased due to the increasing reinforcement ratio. On the other hand, the hardness of the composites increased with increasing reinforcement ratio. However, their cross fracture, and abrasion resistance decreased. It was concluded that it is useful to try different process parameters in order to obtain better mechanical properties in such composites produced by vortex method.Öğe Design a Constitive Fuzzy Logic Model of Warpage on shape Memory Polrethane Parts(ICAT'19, 2019) Katmer, Şükran; Bay, Ömer Faruk; Karataş, ÇetinInjection moulding process of shape memory thermoplastic polymers is important for manufacturing of stimuli-responsive plastic parts in mass production. Moulding conditions have remarkable role on the controlling of permanent shape of moulded parts. Warpage is the one of the main factors, which define the part shape quality. A limited number of experimental studies have been conducted to determine the relationship between warpage and moulding parameters. According to the experimental study, injection pressure and cooling time are the most effective parameters on warpage. But, it is very difficult to define an accurate mathematical model that gives the warpage value with respect to injection pressure and cooling time. In this study, the relationship between moulding parameters and warpage was defined as a constitutive model by using fuzzy logic. Fuzzy model consists of two input variables and one output variable. Cooling time and injection pressure were selected as input variables and warpage was selected as output variable for the fuzzy model. The results showed that the model represented experimental results with high confidence.
