Browsing by Author "Yapıcı, Güney Güven"
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Aging response of az series magnesium alloys after thermo-mechanical processing
Mısırlı, Mustafa (2019-08-20)The current study aims to investigate the effect of thermo-mechanical treatment utilizing both aging and stress aging on the mechanical behavior of warm rolled AZ31 magnesium alloy with inspecting the relationship between ... -
Ambient and elevated temperature mechanical behavior of a high strength aluminum alloy after cold deformation
Shojaei, Kambiz (2016-01)Nowadays, aluminum alloys in automotive and aerospace industries have assigned a noticeable portion in structural applications in comparison to many steel alloys. The aim of this study was to investigate the high-temperature ... -
Application of a novel friction stir spot welding process on dissimilar aluminum joints
Bajilane, Isam Jabbar Ibrahim; 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 ... -
Application of novel constrained groove pressing routes on austenitic stainless steel
Özdemir, Zeynep Güler; Yapıcı, Güney Güven (Springer, 2021-11)In this study, a novel set of constrained groove processing routes was put forward especially to underline the variation of strain paths. Namely, 304 stainless steel sheets were processed by five distinctly specified ... -
A comparative study on the severe plastic deformation of metals by constrained groove pressing
Güler, Zeynel (2018-06)The main purpose of the present thesis is to reveal the microstructural refinement and mechanical behavior improvement of metallic materials, some of which are difficult to work, through severe plastic deformation. Constrained ... -
Cyclic deformation response of ultra-fine grained titanium at elevated temperatures
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven; Demler, E.; Krooss, P.; Wegener, T.; Maier, H. J.; Niendorf, T. (Elsevier, 2019-05)This study focuses on the high-temperature cyclic deformation response (CDR) of ultra-fine grained (UFG) titanium of commercial purity (grade 4) processed via equal channel angular extrusion as a severe plastic deformation ... -
Design and development of a durable series elastic actuator with an optimized spring topology
Yıldırım, M. C.; Şendur, Polat; Kansızoğlu, Mehmet Taha; Uras, U.; Bilgin, Onur; Emre, Sinan; Yapıcı, Güney Güven; Arık, Mehmet; Uğurlu, Regaip Barkan (Sage, 2021-12)This paper aims to present the integrated design, development, and testing procedures for a state-of-the-art torsion-based series elastic actuator that could be reliably employed for long-term use in force-controlled robot ... -
Design and implementation of a robust control scheme for a smart joint
Jabeen, Saher (2017-01)The invention of biomedical tools has made medical treatments more convenient; however, manual insertion of these tools requires years of practice and erroneous insertion into the body may cause ruptures and bleeding. ... -
Design and processing of multi-phase high entropy alloys
The multi-principal element alloys (MPEAs) known as high- and medium-entropy alloys possess promising properties due to their highly distorted atomic crystal structures. Employing multi-elements as principal elements has ... -
Development of a solid state spot welding technique for the manufacturing of detect free joints
Bajilane, Isam Jabbar Ibrahim (2019-06)Development of a Solid State Spot Welding Technique for the Manufacturing of Defect Free Joints.--Friction stir spot welding (FSSW) processing is a recently developed process for joining hard weldability materials, which ... -
Development of an antagonistically actuated smart joint
Vahidyeganeh, Ali; Şimsek, Görkem Muttalip; 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 ... -
Development of antagonistically actuated active joints with shape memory aloys
Vahidyeganeh, Ali (2017-01)The focus of this research work is the development of an active joint antagonistically actuated by shape memory alloys (SMA). Due to their high force to mass ratio these identified as excellent actuator candidates for ... -
Discrete-time integral sliding mode control of a smart joint for minimally invasive surgeries
Jabeen, Saher; Yeganeh, Ali Vahid; Şimsek, 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 ... -
Dynamic characterization and optimization of additively manufactured TPMS lattice structures
Şimşek, Uğur (2021-08-19)Additive manufacturing (AM) has opened new avenues for the manufacturing of structures to achieve challenging engineering tasks. Triply periodic minimal surface (TPMS) lattices, a unique example of such structures, exhibits ... -
Effect of aging on the mechanical behavior of aluminum-steel composites processed by accumulative roll bonding
Tahir, Furqan; Yapıcı, Güney Güven (Elsevier, 2021)Severe plastic deformation (SPD) processes have been widely used to provide ultrafine-grained (UFG) structures along with enriched strength in various metals. This study focuses on accumulative roll bonding (ARB), an SPD ... -
Effect of coating method on the surface characteristics of niti shape memory alloy
Şimşek, Görkem Muttalip; İpekoğlu, M.; Yapıcı, Güney Güven (Trans Tech Publications Ltd, 2020)Metallic materials including stainless steel, cobalt-chromium alloys, titanium and its alloys, and nickel-titanium (NiTi) shape memory alloys have been used in biomedical applications since the 1940s due to their favorable ... -
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 different surface treatments on the tensile and wear behavior of Inconel 625 superalloy and aisi 321 stainless steel
AISI 321 stainless steel and Inconel 625 superalloy are utilized in an extensive range of applications such as aircraft engines, nuclear powerplants and industrial furnaces due to their excellent mechanical properties at ... -
Effect of external stress on the post-aging mechanical properties of rolled magnesium alloys
Mısırlı, Mustafa; Ghobadlou, Alı Hosseınzadeh; Yapıcı, Güney Güven (TANGER Ltd., 2020)In the current study the effects of conventional aging and stress aging on the microstructure and mechanical behavior of warm rolled AZ31 magnesium alloy were investigated. Tensile experiments revealed that the ultimate ... -
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 ...
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