Browsing Faculty of Engineering by OzU Authors "Yapıcı, Güney Güven"
Now showing items 1-18 of 18
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Application of a novel friction stir spot welding process on dissimilar aluminum joints
Ibrahim, Isam Jabbar; Yapıcı, Güney Güven (Elsevier, 2018-10)Intermediate layer friction stir spot welding (IL-FSSW) is introduced in this study as a novel spot welding technique to eliminate the keyhole associated with the conventional friction stir spot welding (FSSW). This process ... -
Development of an antagonistically actuated smart joint
Vahidyeganeh, Ali; Simsek, Görkem; Jabeen, Saher; Bebek, Özkan; Yapıcı, Güney Güven (Trans Tech Publications, 2017)Shape memory alloys with their phase transformation properties; have been broadly implemented in smart structures. In this study, a functional design is presented where two wires actuate antagonistically to achieve motion ... -
Discrete-time integral sliding mode control of a smart joint for minimally invasive surgeries
Jabeen, Saher; Yeganeh, Ali Vahid; Simsek, Görkem Muttalip; Yapıcı, Güney Güven; Abidi, K.; Bebek, Özkan (IEEE, 2016)In this work, a shape memory alloy(SMA) actuator based joint (smart joint) is controlled using a discrete-time integral sliding mode (DISM) control to guide the motion of an active catheter. Controller is designed on the ... -
Effect of commercial purity levels on the mechanical properties of ultrafine-grained titanium
Purcek, G.; Yapıcı, Güney Güven; Karaman, I.; Maier, H. J. (Elsevier, 2011-03-15)Two grades of commercial purity (CP) titanium (grades 2 and 4) were processed using equal-channel angular extrusion (ECAE) at 300 ◦C and 450 ◦C, respectively. The processing temperatures were the minimum temperatures at ... -
Effect of grain size on the very high cycle fatigue behavior and notch sensitivity of titanium
Sajadifar, Seyed Vahid; Wegener, T.; Yapıcı, Güney Güven; Niendorf, T. (Elsevier, 2019-12)The very high-cycle fatigue performances of coarse-grained and ultrafine-grained titanium samples with different geometries at ambient temperature and various stress amplitudes were investigated. Severe plastic deformation ... -
Effect of purity levels on the high-temperature deformation characteristics of severely deformed titanium
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Springer International Publishing, 2017)In the present investigation, high-temperature compression tests were conducted at strain rates of 0.001 to 0.1 s−1 and at temperatures of 873 K to 1173 K (600 °C to 900 °C) in order to study the hot deformation characteristics ... -
Effect of severe plastic deformation on the damping behavior of titanium
Sajadifar, Seyed Vahid; Atli, C.; Yapıcı, Güney Güven (Elsevier, 2019-06-01)In this work, influence of severe plastic deformation on the damping properties of commercial purity titanium is explored. Deformation induced grain refinement improved the strength at room temperature while this effect ... -
Elevated temperature mechanical behavior of severely deformed titanium
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Springer Nature, 2014-05)In this investigation, compression tests were performed at a strain rate of 0.001-0.1 s(-1) in the range of 600-900 degrees C to study the high temperature deformation behavior and flow stress model of commercial purity ... -
Fatigue behavior of friction stir welded joints of pure copper with ultra-fine grains
Salahi, Salar; Yapıcı, Güney Güven (Elsevier, 2015)In order to determine the long term durability of friction stir welded joints with ultra-fine grained microstructure, investigation of the mechanical response with specific emphasis on fatigue behaviour is critical. In ... -
High temperature characteristics of Al2024/SiC metal matrix composite fabricated by friction stir processing
Ghobadlou, Ali Hosseinzadeh; Yapıcı, Güney Güven (Elsevier, 2018-07-25)In the present study, friction stir processing (FSP) is used for the synthesis of an aluminum metal matrix composite (MMC) reinforced by SiC particles. MMC specimens with reinforced microstructures exhibited significant ... -
High temperature deformation behavior of 4340 steel: activation energy calculation and modeling of flow
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven; Ketabchi, M.; Bemanizadeh, B. (Elsevier, 2013-12)The 4340 steel is extensively utilized in several industries including automotive and aerospace for manufacturing a large number of structural components. Due to the importance of thermo-mechanical processing in the ... -
High temperature flow response modeling of ultra-fine grained titanium
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (MDPI AG, 2015)This work presents the mechanical behavior modeling of commercial purity titanium subjected to severe plastic deformation (SPD) during post-SPD compression, at temperatures of 600-900 °C and at strain rates of 0.001-0.1 ... -
Hot deformation behavior of ultra-fine grained pure Ti
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Trans Tech Publications, 2013-11)In the present study, compression tests were performed at a strain rate of 0.001 to 0.1 s(-1) and in the range of 600 degrees C to 900 degrees C to investigate the high temperature deformation behavior and flow stress model ... -
On the mechanical behavior of accumulative roll bonded lightweight composite
Aljashaami, Dhyai Hassan Jawad; Ghobadlou, Ali Hosseinzadeh; Yapıcı, Güney Güven (IOP Publishing, 2019-09)Multi-layered composites have received great interest due to their enhanced mechanical and physical properties. In this study, Al6061/Al2024 composites were processed by accumulative roll bonding as a severe plastic ... -
On the mechanical behavior of cold deformed aluminum 7075 alloy at elevated temperatures
Shojaei, Kambiz; Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Elsevier, 2016-07-18)In the present study, elevated temperature deformation behavior and microstructural evolution of 7075 aluminum alloy at annealed and cold rolled conditions were examined. Isothermal uniaxial tensile tests at a temperature ... -
Optimization of the intermediate layer friction stir spot welding process
Ibrahim, Isam Jabbar; Yapıcı, Güney Güven (Springer Nature, 2019-09)Friction stir spot welding was performed for joining sheets of 2024 and 6061 aluminum alloys, which is otherwise difficult using conventional welding techniques. The presented approach utilizes an intermediate layer to ... -
Study on the refrigerator bottom cabinet cavity acoustic behavior
Öztürk, Anıl; Yapıcı, Güney Güven (International Institute of Acoustics and Vibrations, 2014)Recently, sound comfort has become important in residential houses and noise emission is a distinctive feature for the selection of the home appliances in the same energy class. Refrigerators run continuously when it is ... -
Workability characteristics and mechanical behavior modeling of severely deformed pure titanium at high temperatures
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Elsevier, 2014-01)In the present study, compression tests were performed at temperatures of 600–900 °C and at strain rates of 0.001–0.1 s−1 to study the deformation and workability characteristics of commercially pure titanium after severe ...
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