Department of Mechanical Engineering

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Recent Submissions

Method development for estimation of bleed momentum coefficient using surface pressure measurements and in situ hot wire calibration Çetin, Cenk; Yavuz, Mehmet Metin (2024-07-01) Recently, as a passive flow control method, bleeding technique allowing flow of upstream towards suction side by interior passages, has been utilized on non-slender delta wing planforms, where effective geometries can enha...
Investigation of isothermal entropy change, relative cooling power, and refrigerant capacity of GdCoAl nanocomposite thin film by changing the Al ratio at low magnetic fields of 100 Oe and 1000 Oe Bayer, Özgür; PAT, SUAT (2024-07-01) There are two challenges with magnetocaloric materials (MCMs): the production of low-cost materials and the applicability of MCMs at low magnetic fields. Due to the abundance of Al, the effects of Al composition in GdCoAl ...
Optimization of variable pitch milling tools for improved chatter stability Özşahin, Orkun (2024-06-30) Chatter is an important problem in machining operations which causes poor surface quality, increased tool wear, failure of cutting tool and even machine tool, and excessive noise during machining hence reduced productivity...
Effects of translaminar edge crack and fiber angle on fracture toughness and crack propagation behaviors of laminated carbon fiber composites Asan, Ahmet Murat; Kaman, Mete Onur; Dağ, Serkan; Erdem, Serkan; Turan, Kadir (2024-06-01) In this study, the translaminar fracture toughness of carbon fiber laminated composites with different layer sequences was investigated experimentally and numerically for different crack directions. In the numerical study,...
Performance improvement in a vertical latent thermal energy storage tank with crossing heat transfer tubes Baghaei Oskouei, Seyedmohsen; Bayer, Özgür (2024-05-30) In a vertical latent thermal energy storage (LTES) tank, the lack of natural convection and domination of conduction results in a slow charging rate. On the other hand, due to large thermal resistances between the cold sur...
Simulation of crack closure effect on cracked beam vibrations Günhan, Dağhan; Acar, Bülent; Kadıoğlu, Fevzi Suat (2024-05-02) Vibrations of beams containing cracks are usually investigated by using open or breathing crack models. Neither one of these approaches considers the plasticity induced crack closure (PICC) phenomena which occurs in fatigu...
Investigation of the translaminar fracture behavior of the fiber-reinforced composites stitched perpendicular to their plane Asan, Ahmet Murat; Kaman, Mete Onur; Dağ, Serkan; Erdem, Serkan; Turan, Kadir (2024-05-01) To increase the fracture toughness, the two-dimensional laminated textiles can be stitched with fibers throughout their thickness. But the stitch properties effect the mechanical behavior of the composite plates. Because o...
Effect of impinging flow on hydrothermal characteristics of a pipe-network mini channel heatsink Salamatbakhsh, Elyas; Bayer, Özgür; SOLMAZ, İsmail (2024-05-01) In the current work, a lattice-structured mini channel heatsink is subjected to an impinging flow (IF) in which the flow enters from the top and exits from the lateral sides. An experimental setup is built, and numerical s...
Mechanical Behaviour of Photopolymer Cell-Size Graded Triply Periodic Minimal Surface Structures at Different Deformation Rates Yılmaz, Yunus Emre; Novak, Nejc; Al-Ketan, Oraib; Erten, Hacer Irem; Yaman, Ulaş; Mauko, Anja; Borovinsek, Matej; Ulbin, Miran; Vesenjak, Matej; Ren, Zoran (2024-05-01) This study investigates how varying cell size affects the mechanical behaviour of photopolymer Triply Periodic Minimal Surfaces (TPMS) under different deformation rates. Diamond, Gyroid, and Primitive TPMS structures with ...
Comparative Analysis of Solar Tower and Parabolic Trough Systems for Solar Heat in a Steel Industry Değirmenci, Deniz; Güner, Levent; Taylan, Onur; Inceoğlu, Didem Nedret; Sakallı, Server; Ünal, Erdal (2024-04-10) Concentrated Solar Thermal (CST) systems emerge as a promising alternative to replace fossil fuels used in industrial thermal processes due to their high energy density and dispatchability. In this study, a comparative ana...
Effect of nanoheterogeneities on the fracture toughness and tensile ductility of CuTa metallic glass thin films Behboud, Ali B.; Fadaie, Amir; Motallebzadeh, Amir; ŞEHİRLİ, SERVET; Özerinç, Sezer (2024-04-05) Nanoheterogenenous metallic glasses (MG) can offer improved ductility through a nanoscale modulation in their mechanical properties. However, the relationship between the modulation parameters and the mechanical behavior i...
Effects of triaxiality and lode parameter on deep drawing process Güzelderen, Tolunay; Darendeliler, Haluk (2024-04-01) The aim of this study is to explore the effects of stress triaxiality and Lode angle parameter as a function of the cup height in the deep drawing process. For this purpose, deep drawing of square cups made of AISI304 stee...
Biochar gasification: Insights from pyrolysis atmospheres and gasification heating rates Akgül, Alican; Akın, Süleyman Şener; Güleç, Fatih; Kazanç Özerinç, Feyza (2024-03-15) Gasification is a promising technology for the synthesis of syngas and hydrogen, with char reactivity being a pivotal factor in the design of industrial gasifiers. Despite extensive studies on the gasification characterist...
Fracture toughness of AlTiN coatings investigated by nanoindentation and microcantilever bending Kaygusuz, Burçin; Motallebzadeh, Amir; Karadayı, Özcan; Kazmanlı, Muhammet Kürşat; Özerinç, Sezer (2024-02-15) Metal nitride coatings are increasingly used in MEMS applications. The brittle nature of these coatings makes fracture one of the main failure mechanisms during operation. Therefore, quantifying the fracture toughness of n...
A Novel Approach for Local Structural Modification of Nonlinear Structures Ceren Ekinci, E.; Bülent Özer, M.; Özgüven, Hasan Nevzat (2024-01-01) Structural modification methods provide powerful tools to calculate the dynamic behavior of a modified structure from that of the original one. In general, either the modal properties or responses of the original structure...
A Non-retracted Path Generation Algorithm for Material Extrusion Type of Additive Manufacturing Ozcan, Melih; Hergul, Yigit; Yaman, Ulaş (2024-01-01) Path planning algorithms are utilized in various fields to improve the efficiency of the defined tasks. Regarding extrusion based additive manufacturing (AM) technologies, an optimized path performs the same task in less t...
Humanized brain organoids-on-chip integrated with sensors for screening neuronal activity and neurotoxicity Saglam-Metiner, Pelin; Yıldırım, Ender; Dincer, Can; Basak, Onur; Yesil-Celiktas, Ozlem (2024-01-01) The complex structure and function of the human central nervous system that develops from the neural tube made in vitro modeling quite challenging until the discovery of brain organoids. Human-induced pluripotent stem cell...
Four-Bar Function Generation Using Excel Solver Söylemez, Eres; Kiper, Gökhan (2024-01-01) The Chapter presents a simple and efficient way of approximating a function with a four-bar mechanism using four or five design parameters including one or both of the initial crank angles. The method only involves solutio...
Experimental Modal Analysis of Structures with High Nonlinear Damping by Using Response-Controlled Stepped-Sine Testing Karaağaçlı, Taylan; Özgüven, Hasan Nevzat (2024-01-01) In the last decade, various promising nonlinear modal identification techniques have been developed based on the nonlinear normal mode (NNM) concept. Most of these techniques rely on the phase resonance testing approach wh...
Close-contact melting and natural convection in unconstrained melting: A parametric study Baghaei Oskouei, Seyedmohsen; Li, Zi-Rui; Bayer, Özgür; Fan, Li-Wu (2024-01-01) Close-contact melting (CCM) is a phenomenon that can be achieved in latent thermal energy storage (LTES) units where the falling of solid PCM is realized. On the other hand, natural convection (NC) plays an important role ...

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