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Öğe 3D microstructural finite element simulation of martensitic transformation of TRIP steels(Brazilian Association of Computational Mechanics, 2018) Toros S.; Öztürk F.In this paper the effects of deformation modes on martensitic transformation for TRIP steels which are composed of Ferrite, Bainite and Retained austenite are investigated in the view of the microstructural level. For this porpose the simulations are run for a synthetically generated microstructure which have 55% Ferrit, 35% Bainite and 10% Retained austenite. In the simulations tensile, biaxial and shear type deformation modes are considered. The results reveal that biaxially loaded microstructure has the maximum amounts of martensite phases at the end of the given deformation and the less martensite is occurred in the shear type loading condition. © 2018 Brazilian Association of Computational Mechanics. All rights reserved.Öğe New trend in aerospace industry: Al-Li based alloys [Havacılık endüstrisinde yeni trend: Al-Li esaslı alaşımlar](Gazi Universitesi Muhendislik-Mimarlik, 2019) Kılıç S.; Kacar İ.; Öztürk F.Al-Li (Aluminum-Lithium) alloys have become the focus of the aerospace industry due to their low density and high elasticity modulus, excellent corrosion resistance, high hardness, high fatigue crack growth resistance, and low fracture toughness. Alloys continue to be used in various structural parts of the aircrafts such as seat beams, floor beams and columns, wing beams, cradle frames, and research studies are intensively going on about its future use for other structural parts. As with all materials, there are various problems in these alloys. In this study, the use of Al-Li based alloys in the aerospace industry, the problems encountered, and the proposal of solutions have been examined. © 2019 Gazi Universitesi Muhendislik-Mimarlik. All rights reserved.Öğe Simulations of interference and interfacial pressure for three disk shrink fit assembly(2010) Öztürk F.; Woo T.-C.In this study, three disk shrink fit assembly (solid shaft-sleeve-holder) was modeled by finite element method to determine the effects of the interference or shrinkage allowance on interference or interfacial pressure. Stress distributions along the thickness were plotted. The highest stresses were observed at the inner surface of the holder. Solid shaft had a uniform stress distribution. Sleeve and holder had non uniform stress distributions, which were higher at the inner surface and lower at the outer surface. Higher stresses can be reduced by lowering the interference between the sleeve and the holder. Equal interfacial pressures between disks can be accomplished using different interferences. It was concluded that finite element simulation is the only solution for complex geometry and various loading conditions.
