Türkan, Murat
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Turkan, Murat
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murat.turkan@ieu.edu.tr
Main Affiliation
05.10. Mechanical Engineering
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Current Staff
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Documents
8
Citations
73
h-index
4
Documents
6
Citations
56
Scholarly Output
7
Articles
6
Views / Downloads
15/24
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
56
Scopus Citation Count
73
WoS h-index
3
Scopus h-index
4
Patents
0
Projects
0
WoS Citations per Publication
8.00
Scopus Citations per Publication
10.43
Open Access Source
3
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0
| Journal | Count |
|---|---|
| Fatigue & fracture of engineering materials & structures | 1 |
| Journal of Achievements in Materials and Manufacturing Engineering | 1 |
| Journal of the Balkan Tribological Association | 1 |
| Materıals Today Communıcatıons | 1 |
| Mechanıka | 1 |
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7 results
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Now showing 1 - 7 of 7
Article Citation - WoS: 1Citation - Scopus: 2Low Cycle Fatigue Behavior of Az31 Magnesium Alloy Joined by Friction Stir Welding(WILEY, 2024) Türkan, Murat; Karakaş, Özler; Berto, FilippoThis study, aims to weld the 5.2 mm thick AZ31 magnesium alloy with conventional friction stir welding at the highest joining efficiency. As a result of the experiments, 88% joining efficiency in tensile strength has been obtained at 1250 rpm, 400 mm.min-1 welding parameter. As a result of micro-macrostructure photographic examinations of the samples joined with these parameters, it is seen that the joining is fully realized. Samples joined with these parameters have been used in fatigue tests. According to the strain-controlled low cycle fatigue test results performed on welded and base metal samples, the base metal samples have exceeded the 50,000-cycle limit without failure, with an elongation rate of 0.3%, and the welded samples with an elongation rate of 0.2%. Low cycle fatigue parameters of welded and base metal samples have been obtained according to the Coffin-Manson-Basquin equation. In joining AZ31 alloy with FSW, a high joining efficiency of 88% was achieved. Similar fatigue test results showed that the weld quality was retained along the joint. Coffin-Manson-Basquin equation constants were determined.Article Citation - WoS: 4Citation - Scopus: 4The Influence of Corrosion on the Mechanical Behavior of Aisi 316l Stainless Steel Welds(Kaunas Univ Technol, 2019) Turkan, Murat; Karakas, OzlerStainless steels are widely used because they have high corrosion resistance. However, they can also suffer corrosion due to the constant aggressive effect of the environment or due to chemical and physical malfunctions. It is of great importance to determine the behavior of welded austenitic stainless steels in corrosive environments for safer construction. For this reason, in this study, the corrosion and mechanical behavior of welded austenitic stainless steels exposed to salt spray was investigated. In the first stage, commercially available AISI 316L austenitic stainless steel materials with 4 mm thickness were joined with the TIG welding method, both with and without filler metal. To specify the structure of the weld zone, the micro-macrostructure and micro hardness values of the welded samples were examined before the salt spray experiments. The salt spray test was performed in compliance with the EN ISO 9227 Corrosion test in artificial environments standard, in which the tensile samples of welded AISI 316L materials were subjected to salt spray test up to 1000 hours. Tensile tests were carried out following salt spray tests.Article Citation - Scopus: 2Corrosion and Mechanical Behaviour of Tig-Welded Aisi 304l Stainless Steel(Scibulcom Ltd., 2017) Türkan M.; Karakas Ö.Z.This study is an investigation into the effect of filler metal in Tungsten Inert Gases (TIG) welding of 304L austenitic stainless steel with 4 mm of thickness. Base materials were welded using double-sided single-pass TIG welding method, both with and without filler metal. There was a rigorous analysis for the welding properties, including microstructure, penetration, mechanical properties and corrosion behaviour. The microstructure investigation shows that ?-ferrite was formed in the austenite matrix in the welding metal for both joints. Penetration investigation indicates very high welding quality of both joints without obvious defect, such as cracks, lack of fusion, incomplete penetration and strips of defects. The tensile tests result for joints without filler metals have higher ultimate tensile strength, and they have greater elongation values. However, the yield strength is equal. After the salt spray tests, no corrosion was observed on the welding zones. Moreover, there is no loss of weight for all joints. As a result, it is possible for 4 mm thick AISI 304L stainless steels to be welded by double-sided single-pass TIG welding method, both with and without filler metal. © 2017 Scibulcom Ltd. All rights reserved.Article Citation - WoS: 34Citation - Scopus: 40Numerical Modeling of Defect Formation in Friction Stir Welding(Elsevier, 2022) Turkan, Murat; Karakas, OzlerThis study presents an investigation of welding defect formation in joining AZ61 magnesium alloy with friction stir welding by means of a 3D finite element model. The numerical model was created and analyzed in the ABAQUS software. This numerical model uses coupled Eulerian Lagrangian formulation, modified Coulomb's friction law, Johnson-Cook material law, mass scaling technique, and temperature dependent friction coefficient values. The numerical model was validated with experimental results in terms of heat input, temperature dis-tribution, plastic deformation type-amount, and weld defect formation in the weld zone. In friction stir welding, the heat input with a certain tool simply changes directly proportional to the ratio of tool rotation speed to tool feed rate for constant tool compressive force. In the numerical model, as in the experimental study, when the ratio of tool rotational speed to tool feed rate is 2, low heat input results in insufficient plastic deformation, leading to the formation of weld defects in the form of void. When the ratio of tool rotational speed to tool feed rate is 3, however, it was observed that sufficient heat input is provided, and no welding defects occur. The generated numerical model enables the determination of the welding defects that occur in the form of voids in the friction stir welding in a very short processing time. Besides, weld seam geometry can be predicted quite accurately with this model.Article Citation - Scopus: 4The Effect of Welding Defects To the Tensile Behavior in Corrosive Environment of Aisi 304l Stainless Steel Joined With Shielded Metal Electrode(International OCSCO World Press, 2017) Türkan M.; Karakaş Ö.Purpose: Determination of the tensile behavior of welded constructions made of austenitic stainless steel in corrosive environments is of great importance for the safer use of the construction. When austenitic stainless steels are welded together, welding defects can occur in some cases. And stainless steels are used in corrosive environments. Thus, we are aimed to investigate the effect of welding defects the tensile behavior in corrosive environment of AISI 304 L stainless steel joined with shielded metal electrode. Design/methodology/approach: Hardness measurements and micro-macro structures examination were made before the corrosion test to characterize the structure of the weld zone. Corrosion tests were carried out in accordance with EN ISO 9227 by exposing the welded tensile specimens to salt spray for 24-96-240-480-720-1000 hours. After the salt spray test, tensile tests were performed. The fractured surfaces were examined following the tensile tests by scanning electron microscope (SEM). Findings: A significant decrease in the tensile strength of the material was observed with the increase of the salt spraying period as a result of the tests. It is worth noting that corrosion products were occurred especially in the areas of welding defects. Research limitations/implications: This study was performed on materials containing welding defects. In addition, the corrosive environment was provided by salt spraying. It should not be forgotten that the materials may behave differently in different corrosive environments. Originality/value: While there are studies regarding effects of welding defects and corrosion individually, no study has been found in the literature which considers the effect of welding defects within corrosive environments on the material strength. Therefore, this study presents novel findings by considering both detrimental effects at the same time. The study shows significant decrease in strength of the material due to welding defects and corrosive environment. © International OCSCO World Press. All rights reserved. 2017.Article Citation - WoS: 17Citation - Scopus: 21Two Different Finite Element Models Investigation of the Plunge Stage in Joining Az31b Magnesium Alloy With Friction Stir Welding(Springer International Publishing Ag, 2021) Turkan, Murat; Karakas, OzlerThis study presents an investigation of the plunge stage in joining AZ31B magnesium alloy with friction stir welding using two different 3D finite element models based on Arbitrary Lagrangian-Eulerian formulation and Coupled Eulerian-Lagrangian formulation. The investigations are made with the ABAQUS program. Johnson-Cook plastic material law and Coulomb friction law are used in both models. Models are compared in terms of temperature, strain distribution, and processing time. In both models, very similar temperature and strain distributions are obtained in the weld zone and the models are validated by experimental results. In addition, with the increase in the rotational speed of the tool, temperature and strain in the welding zone increase similarly in both models. In the model using the Arbitrary Lagrangian-Eulerian formulation, mesh distortions occur when high mesh density is not created in the plunge zone. No problems related to mesh distortion are encountered in the model using Coupled Eulerian-Lagrangian formulation. Moreover, it is found that the model using the Coupled Eulerian-Lagrangian formulation has a lower processing time and this processing time is not affected by the rotational speed of the tool.Conference Object Concept Design Of Supportive Mechanism For Foldable Stretchers Used İn Ambulances;(Institute of Electrical and Electronics Engineers Inc., 2024) Üstünkarlı, Nursun; Kizil, Melahat; Türkan, Murat; Dülger, Lale CananAmbulance workers face many risks arising from the nature of the service they provide. One of these risks is musculoskeletal injuries. Manual use of ambulance stretchers requires transporting seriously ill patients, which can cause occupational diseases for pre-hospital medical staff. The aim of this study is to develop mechanism that can be placed on an existing ambulance stretcher so that the stretcher can be lifted and lowered without the need for manpower. This apparatus uses a rechargeable system without disrupting the mechanism of the stretcher. © 2024 IEEE.
