Yazar "Cetinarslan, Cem S." seçeneğine göre listele

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    Determining the influence of surface roughness on materials flow of various materials using grid lines during cold forming
    (Emerald Group Publishing Limited, 2010) Cetinarslan, Cem S.; Sahin, Mumin
    Purpose - The purpose of this paper is to determine the influence of surface roughness on materials flow of various materials using grid lines during cold forming. Design/methodology/approach - The study is focused on the investigation of the influence of the surface roughness on the materials flow for different materials using grid lines in the upsetting. Stainless steel, SAE 1020 steel, commercially pure aluminum, commercially pure copper and CuZn(40)Pb(2) brass are used as the test materials. Upsetting process is applied to the cylindrical specimens using the flat end dies. Strain distributions on the free surfaces of cylindrical upset specimen are measured for different upsetting reductions. Strain distributions on the free surfaces are obtained by the measurements of the dimensions of the square grid elements before and after the upsetting process. Experimental results are placed into graphical plots. Findings - It is found that surface roughness is effectual on the strain changes on the free surfaces with the increasing deformation ratio for especially two types of steel specimens. There has been no considerable effect on aluminum, copper and brass specimens. Research limitations/implications - It would be interesting to search the surface roughness, R(sk) and other parameters describing the bearing properties of the surface of more materials. Future work could be concentrated on the cold forming of these materials. Practical implications - Different forming technologies are nowadays widely applied in mass production of mechanical components for needs of transportation, electronics, household appliances, etc. In order to reduce costs, manufacturers are trying to minimize additional machining and therefore to implement the influence of surface roughnesses on materials flow of various materials. Originality/value - The main value of this paper is to contribute to studies on the influence of surface roughness on materials flow of various materials.
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    Effect of aspect ratio on barreling contour and variation of total surface area during upsetting of cylindrical specimen
    (Elsevier Sci Ltd, 2007) Cetinarslan, Cem S.
    The barreling phenomenon that occurs at the upsetting of a cylindrical specimen and the effect of aspect ratio (hld) on varying of a barrel contour were the main subject of this study. Aluminum 7075 (AlZnMgCu1.5) specimens were used as test specimens in the experiments. Specimens were upset between flat faced dies. Measurement data of upset specimens, which were obtained from experiments, are presented graphically. Progression of barreling contour and variation of total surface area according to the increase of barreling was investigated for different aspect ratios and a determined friction value and surface roughness. (C) 2006 Elsevier Ltd. All rights reserved.
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    Effect of cold plastic deformation on electrical conductivity of various materials
    (Elsevier Sci Ltd, 2009) Cetinarslan, Cem S.
    This study is focused on the investigation of the effect of cold plastic deformation on the electrical conductivity properties of different materials. The plastic deformation that occurs at the upsetting of the specimen and the varying of the conductivity properties were the main subject of this study. Aluminium, copper and brass were used as the test materials in the experiments. Measurement results of the upset (deformed) specimens were obtained with a conductivity meter instrument. Result which was obtained from the experiments was presented graphically. Finally, it is concluded that in general electrical conductivity decreases slightly due to plastic deformation of the deformed materials. (C) 2008 Elsevier Ltd. All rights reserved.
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    Effect of surface roughness on friction coefficients during upsetting processes for different materials
    (Elsevier Sci Ltd, 2007) Sahin, Mumin; Cetinarslan, Cem S.; Akata, H. Erol
    Presented study is focused on the investigation of the effect of the surface roughness on the frictional properties for different materials and conditions. Three types of steel, commercially pure aluminium and annealed CuZn40Pb2 brass were used as the test materials in the experimental part of the study. Ring compression test procedure was applied to the specimens using flat end upsetting dies. Dimensional changes of the specimens after the tests were measured in order to obtain the variations of the increments in the inner diameters versus upset ratios. Experimental results were placed into ring compression calibration curves for each of the material type and surface conditions. Roughness measurements were carried out using a digital roughness meter. Upsetting tests were carried out using a hydraulic press of 150 metric tons with 5 mm/s ram speed. (c) 2005 Elsevier Ltd. All rights reserved.
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    THE EFFECT OF THIN SECTION CASTING ON THE HARDNESS AND TENSILE STRENGTH OF GGG40
    (Tanger Ltd, 2014) Genc, Serhan Karaman; Cetinarslan, Cem S.; Ozel, Kaan
    Today, ferrous metals include large part of industry in the world although many non-ferrous metals and other materials discovered. Steel and cast iron are the important ferrous metals because of their mechanical, physical properties and behaviors. After the discovery of the nodular cast iron, it began to burst into prominence. Because, its similarity to steels from the point of mechanical properties and to cast irons in terms of chemical and physical properties. Besides, nodular cast iron has low cost, good castability and convenient machinability property. In this study, GGG40, which is widely used in modern industrial production, was chosen as test material. The test specimens with different diameters 20 mm, 25 mm and 30 mm were prepared by casting. Thin section casting is the fundamental point of this study. Then, tensile tests, brinell tests and spectrum analysis were performed and investigated.
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    Mechanical and metallurgical properties of pipeline steel manual arc welds dependent on cellulosic electrode coating
    (Carl Hanser Verlag, 2018) Cetinarslan, Cem S.; Ozel, Kaan; Tufan, Mehmet
    Spiral welded pipes of 1016 mm diameter and 8.80 mm thickness, made of St 44.2 (DIN 17100) structural steel and commonly used for drinking water pipelines were joined via coated electrodes through manual arc welding. In the welding process, cellulosic electrodes of three different brands were used, after which non-destructive and destructive testing methods and metallurgical probing were carried out for the parts joined. In this study, welding metal, fusion lines, heat affected zones and base material micro structural variations were experimentally investigated as well as tensile, hardness and bending tests according to electrode brands used for welded parts and interpreted through existing literature on the subject.
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    Mechanical properties of friction stir welded 5083 aluminum alloys
    (Carl Hanser Verlag, 2017) Ozel, Kaan; Cetinarslan, Cem S.; Sahin, Mumin
    Friction stir welding (FSW) is a solid phase welding method, developed for aluminum alloys by The Welding Institute (TWI), which is applied in non-traditional welding techniques. The industrial applications of this method have been intensified in recent years. In this method, parts in various geometries can be joined in solid state. In this study, Al-Mg based 5083 aluminum alloys, which are widely used in industry, were joined by friction stir welding method and the mechanical properties of the joints were determined. The mechanical properties of joined parts were experimentally investigated using tensile, hardness and fatigue tests for 550, 700, 800 and 1400 rpm rotation speeds with 40 mm x min(-1) and 80 mm x min(-1) progressing speed, respectively.
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    Properties of Al/SiC metal matrix composites
    (Carl Hanser Verlag, 2018) Sahin, Mumin; Guler, Can; Misirli, Cenk; Cetinarslan, Cem S.; Eisazadeh, Hamid
    Metal matrix composites have higher resistance compared to ceramic and polymer matrix composites. In this study, an aluminum 5754 alloy was fortified using 10 % SiC to obtain a metal matrix composite with properties superior to the original alloy. An improvement of mechanical properties was obtained by reinforcement with aluminum matrix composites which can be produced with various techniques. Mechanical properties of the composite material (Al/SiCp) were initially investigated, and then, the metallurgical properties were determined using an optical metal microscope and SEM. Furthermore, the percent of elongation, tensile strength and Vickers hardness are the input parameters for the mechanical properties. The tensile strength as an output response parameter of Al/SiCp materials was analyzed using experimental Taguchi technique design as an orthogonal array. In the present investigation, experiments were carried out to compare experimental results with predicted optimal values. ANOVA analysis revealed that the percent elongation-PE (%) was the input parameter having the highest statistical influence on tensile strength. It could be shown that the composite material was resistant against both static and dynamic loads. It was also shown that silicon carbide mixed homogenously with aluminum.
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    A study on influences of some process parameters on cold drawing of ferrous wires
    (Natl Inst Science Communication-Niscair, 2012) Cetinarslan, Cem S.
    Wire drawing process involves pulling metal wire road through a die by means of a tensile force applied to exit side of die. This paper is an experimental study that presents influences of some parameters like deformation (total reduction) ratio and drawing speed on cold drawing of ferrous wires. Wire drawing method is applied to C45, C63, C65 and C70 materials for different deformation ratios and different drawing velocities. Subsequently, these process influences are considered by means of tensile and torsion tests. With these investigations, it can be simply observed that the deformation ratio and drawing speed parameters clearly affect tensile and torsion strength (number of twist) of ferrous materials. In addition to these observations, from the results of experiments it can be concluded that C content is also effective on tensile and torsion strength of steel wires. Finally, tensile strength and twist number values are obtained for C45, C65 and C70 wire material as functions of drawing speed and deformation (total reduction) ratio by using the statistical analysis from the experimental data.
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    TENSILE PROPERTIES OF COLD-DRAWN LOW-CARBON STEEL WIRES UNDER DIFFERENT PROCESS PARAMETERS
    (Inst Za Kovinske Materiale I In Tehnologie, 2013) Cetinarslan, Cem S.; Guzey, Ali
    This study demonstrates the influence of drawing-process parameters such as reduction (deformation) ratio and drawing velocity on the tensile properties of various low-carbon cold-malleable steel wires. Standard tensile tests were realized on four types of wires - SAE1006, SAE1008, SAE1015 (Cq15) and SAE10B22 (20MnB4) - at various process parameters. This experimental study shows how two of the main process parameters, the deformation ratio and drawing velocity, clearly influence the tensile properties (yield stress, ultimate tensile strength, and elongation at rupture) of steel-wire materials.