Profile URL: https://hdl.handle.net/20.500.13091/11566
Job Title:Arş. Gör. Uzm.
Email Address:maydin@ktun.edu.tr
Main Affiliation:02.10. Department of Mechanical Engineering
Status: Current Staff
ORCID:
0000-0001-5457-8340
0000-0001-5457-8340YÖK Akademik: 20B5CBE56F0E66E8
Google Scholar:
cl8xlWcAAAAJ
cl8xlWcAAAAJName Variants:
Aydin, Mevlut
12 results
Scholarly Output Search Results
Now showing 1 - 10 of 12
Article Drilling CF/PEEK Thermoplastic Composite: Optimization of Drill Point Angle and Cutting Parameters Using Nature-Inspired Hybrid Optimization(Elsevier Ltd, 2026) Tosun, Onur; Yapan, Yusuf Furkan; Aydın, Mevlüt; Uysal, AlperArticle Citation - WoS: 6Citation - Scopus: 6A Study on the Effect of the Roller Burnishing Process on the Axial Fatigue Performance and Surface Integrity of Aisi 4340 Steel(Springer Heidelberg, 2022-05-08) Aydın, Mevlüt; Türköz, MevlütIn this study, the effect of the roller burnishing process on surface integrity and fatigue performance of AISI 4340 steel, which had been used in the cylinder of pressure intensifier, was investigated. The effects of burnishing depth, feed rate, and burnishing speed parameters of the roller burnishing process were examined. The roller burnishing process was applied to standard fatigue test specimens. After burnishing, surface roughness was measured, and fatigue life was determined by axial fatigue tests. The novelty of the study is the investigation of the axial fatigue performance of AISI 4340 steel at a specific stress ratio. Optimum levels of roller burnishing process parameters were determined for the lowest surface roughness and the highest fatigue life. The surface roughness was reduced from 2.98 to 0.51 mu m. It has been observed that the burnishing depth was the highest effect on the surface roughness at 78%. The most effective parameter on the fatigue life was the feed rate with a contribution ratio of 57%. Up to 70% improvement was obtained in the fatigue life of AISI 4340 steel.Article Citation - WoS: 1The Influence of Fused Filament Fabrication Parameters on the Fracture Behavior of Pla Specimens Considering Energy Consumption(Konya Teknik Univ, 2024-04-01) Öztürk, Osman; Sen, Muhammed Arif; Aydın, MevlütFused Filament Fabrication (FFF) is a 3D (three-dimensional) printing technology that allows the production of polymers with a wide range of infill densities and unlimited geometric variations. Because of this flexibility, mechanical properties can be optimized by tuning printing parameters. However, the energy consumption during fabrication varies significantly for different printing settings. In the present study, both maximum fracture force and minimum energy consumption of 3D printed PLA (Polylactic Acid) are achieved together by optimizing the printing parameters using CPA (Cyclical Parthenogenesis Algorithm) optimization algorithm. Firstly, a quasi-static penetration test is performed to measure the maximum fracture force. The energy consumption of each specimen is also calculated. Then, maximum fracture force and energy consumption are modeled and integrated into the optimization algorithm. As a result, the three most convenient parameter levels are 84%, 6.83 mm, and 0.19 mm for infill ratio, specimen thickness, and layer height, respectively. While high infill ratio values and specimen thickness increase mechanical performance, these parameter levels are disadvantageous for energy consumption. As a result of optimization, parameters that provide balanced strength and energy consumption were obtained. Fracture force and energy consumption are 1829.87 N and 134.56 W, respectively for the validation experiment of the optimal solution.Conference Object Effect of Shrink Fit Process on Total Equivalent Stress and Total Amount of Material(2021) Aydın, Mevlüt; Türkoz, MevlutPressure intensifier’s, hydraulic cylinders and the extrusion containers are manufactured in compound layers in order to resist the stresses caused by the very high internal pressures. The assembly of the cylinder layers named "shrink fit” is done within certain shrinkage allowances. Thus, the compressive stresses created by the outer cylinder on the inner cylinder. Compressive stresses reduce the level of radial tensile stresses. In this study, the differences in stress levels of compound cylinders with different material pairs operating under ultrahigh pressure were investigated. In addition, the lightest cylinder that can be obtained by determining the optimum dimensions in compound cylinders with the same stress value has been investigated. And the weight savings that can be achieved in case this stress value is carried with a single layer cylinder has been determined. The maximum equivalent stresses in the cylinders were determined by the Finite Element Method (FEM). In this context, material pairs of Aluminium-Steel, Steel-Steel and GGG40 (Cast Iron)-Steel were used. According to the results of the analysis, 716 MPa equivalent stress was calculated under 350 MPa pressure in a single layer cylinder. This equivalent stress was reduced to 579 MPa by using the same amount of material with the Steel-Steel shrink-fit process. The optimum cylinder diameter dimensions with the same stress were determined. The total amount of steel used was 6.65 kg in a single-layer cylinder, this value decreased to 3.46 kg in the compound cylinder with optimum diameters. So, up to 52% of the amount of material was saved with the shrink-fit process.Article Optimization of Pre-Turning Parameters for Diamond Burnishing of Aisi 4340 Steel(2024) Aydın, Mevlüt; Gökçepınar, Ömer Faruk; Kalyoncu, MeteThe presented study investigated for the first time the pre-turning performance before the diamond burnishing of AISI 4340 hardened steel under various cutting speeds, feed values, and cutting depths at flood cooling cutting conditions. Multi-objective optimization was conducted to obtain an effective pre-turning process regarding total cost and surface characteristics. The results showed that the pre-turning parameters must be optimized to benefit from diamond burnishing effectively. It was also observed that the diamond burnishing could have been more influential on pre-turned specimens with high surface roughness. Under the bohroil-added flood-cutting conditions, the average surface roughness and maximum roughness depth improved by 63.4% and 48.5%, respectively. The most influential parameters for average surface roughness and maximum roughness depth were the feed values with 98.2% and 99.3% contribution ratios, respectively. The Bees algorithm optimized the pre-turning parameters in terms of output parameters. The optimum cutting speed, feed values, and cutting depth levels are 264 m/min, 0.1325 mm/rev, and 0.55 mm, respectivelyArticle Citation - WoS: 1Citation - Scopus: 2Numerical and Experimental Investigation of the Effect of Double-Sided Hydroforming Process on Wrinkling Damage by Optimizing Loading Curves With Adaptive Control(Springer London Ltd, 2022-06-08) Akay, Selahattin Burak; Halkacı, Hüseyin Selçuk; Öztürk, Ekrem; Öztürk, Osman; Atas, Gürkan; Aydın, Mevlüt; Türköz, Mevlüt; Dilmeç, MuratIn this study, by using the double-sided hydroforming process (DSHP), scientific studies have been conducted to reach the highest formability possible with today's technology in deep drawing at room temperature and to produce difficult-to-shape parts. For the first time, the type-2 fuzzy logic controller (T2FLC) working with adaptive finite element analysis (aFEA) was applied to the DSHP, with the expectation that it would be a satisfactory solution to problems such as wrinkling, especially in the production of parts with different cross sections in the direction of the axis. In the literature, no study was found in which adaptive finite element analysis (aFEA) integrated with fuzzy logic control algorithms and genetic algorithm was applied to the DSHP to obtain the optimum back pressure profile. T2FLC was developed for the conical workpiece, and the variables used in the cylindrical workpiece were used first. DSHP is modeled with finite element method, and fuzzy logic algorithms have been developed to provide adaptive control in analyses. Using the aFEA-FLC optimum loading profiles also internal pressures and blank holder force loading profiles were determined. DSHP experiments were performed by the optimum loading profiles, and manufactured part geometry was compared with the part manufactured by non-applied back pressure in the sheet hydroforming process. By using the loading profiles obtained sheet metal parts have been successfully shaped numerically and experimentally without wrinkling or any other damage. It has been observed that as soon as the back pressure is applied, the wrinkling disappears, and the parts can be formed completely. It was concluded that DSHP is more effective than other hydroforming methods in terms of preventing wrinkling in axisymmetric parts with variable cross section.Article Citation - WoS: 1ULTRA YÜKSEK BASINÇTA ÇALIŞAN KALIN CİDARLI SİLİNDİRLERİN TASARIMINA ETKİ EDEN PARAMETRELERİN SAYISAL VE ANALİTİK OLARAK ARAŞTIRILMASI(Konya Teknik Univ, 2022-06-01) Aydın, Mevlüt; Türköz, Mevlüt; Yapan, Yusuf FurkanBu çalışmada ultra yüksek basınç altında çalışan kalın cidarlı silindirlerin tasarımına etki eden geometrik parametreler araştırılmıştır. Bu kapsamda, 350 MPa basınç altında, tasarım parametrelerinin silindir iç yüzeyinde meydana gelen maksimum gerilmelere ve katmanlar arasındaki maksimum ara yüzey basıncına etkileri analitik ve nümerik olarak belirlenmiştir. Tasarım parametreleri sırasıyla iç silindir çapı, iç ve dış cidar kalınlıkları ile tek taraflı sıkı geçme toleransıdır. Parametrelerin etkileşimi ve sonuçların anlamlılığını araştırmak için tam faktöriyel deney tasarımı oluşturulmuştur. Sonuçlara regresyon ve varyans analizleri uygulanmıştır. Sonuç olarak silindirde oluşan maksimum gerilmeye etki eden en önemli parametrenin % 32.7 ile sıkılık toleransı olduğu bulunmuştur. İç cidar kalınlığının ise %6.2 oranla gerilme düzeyi üzerinde en az etkiye sahip olduğu görülmüştür. Ayrıca kalın cidarlı silindirlerin tasarımında Sonlu Elemanlar Analizlerinin de (SEA) kullanılabilirliğini göstermek için basınç altındaki silindirlerde meydana gelen Von-Mises eşdeğer gerilmeleri ve ara yüzey basıncı SEA ile de elde edilmiştir. SEA sonuçlarının analitik sonuçlarla karşılaştırılması ile SEA’ların güvenilirlikleri belirlenmiştir. SEA’lar iki farklı (Ansys ve Solidworks) sonlu elemanlar çözücüsü kullanılarak gerçekleştirilmiş ve aralarındaki hesap farkı tespit edilmiştir. Gerilme değerinde Solidworks ve analitik çözüm arasındaki fark % 2.05 iken Ansys ve analitik çözüm arasındaki fark % 0.5 olarak hesaplanmıştır. Buradan SEA çözücülerinin her ikisinin de oldukça yüksek doğrulukta tahminlerde bulunabildiği tespit edilmiştir.Master Thesis Yüksek Basınç Altındaki Hidrolik Silindirlerin Yorulma Performanslarının İyileştirilmesi(Konya Teknik Üniversitesi, 2021) Aydın, Mevlüt; Türköz, MevlütSanayide kullanılan yapısal parçalar genellikle değişken yüklemeler altında çalışırlar. Bu yüklemeler altında, bir süre sonra, genelde malzemenin yüzeyinden başlayarak ilerleyen çatlaklar büyüyerek malzemenin akma dayanımlarının çok altındaki gerilmelerde bile yorulup kırılmasına sebep olur. Ultra yüksek basınç altında çalışan hidrolik silindirlerde de yorulma önemli bir problemdir. Yorulma, genelde yüzeyde başladığından, tekrarlı yüklere maruz kalan malzemelerin yüzeylerindeki kusurlar malzemenin beklenilenden erken yorulmasına sebep olabilmektedir. Bu nedenle, yüzeydeki kusurları en aza indirmek için çeşitli parlatma ve kaplama gibi yüzey işlemleri geliştirilmiştir. Bu işlemlerden en yaygın olanlardan biri de ezerek parlatma işlemidir. Ezerek parlatma işlemi, malzeme üzerinden talaş kaldırmadan, ön işlem sonunda oluşan pürüzlülükleri plastik deformasyona uğratıp birbirleri üzerine yığarak, yüzeyi daha pürüzsüz hale getiren işlemdir. Pürüzlerin ezilmesiyle yüzeyde kalıntı basma gerilmeleri oluşur ve bu da yüzeyde oluşacak çatlağın gecikmesini sağlar. Bu yüksek lisans tezinde ilk olarak yüksek basınçlarda çalışan katmanlı hidrolik silindirlere uygulanan yüzey işlemlerinin yorulma ömrüne olan etkisi incelenmiştir. Deneyler sırasında oluşan problemlerden dolayı tezdeki yöntem değiştirilmiş ve AISI 4340 malzemenin yüzey özelliklerine ve yorulma ömrüne ezerek parlatma işleminin etkisi araştırılmıştır. Standart yorulma testi numunelerine farklı ezme miktarı, ilerleme hızı ve parlatma hızı parametrelerinde ezerek parlatma işlemi uygulanmış ve sonuçta oluşan yüzey pürüzlülüğü, mikrosertlik ve yorulma ömürleri ölçülmüştür. Ezerek parlatma işlemi parametrelerinin en düşük yüzey pürüzlülüğü ve en yüksek yorulma ömrü için optimum seviyeleri belirlenmiştir. Ayrıca tornalama işleminde oluşan takım izlerinin, ezerek parlatma yöntemiyle azaltıldığı, 3D yüzey topoğrafya görüntüleriyle gösterilmiştir.Article Citation - WoS: 3Citation - Scopus: 5Enhancing Formability of Ti-6al Cylindrical Cups by Pulsating Hydroforming Process: Experimental, Numerical and Microstructural Investigations(Elsevier B.V., 2024) Öztürk O.; Aydın M.; Gökcepınar Ö.F.; İlbeyli H.M.; Korkmaz H.G.; Yapan Y.F.; Dilmeç M.; Öztürk, Osman; Yapan, Yusuf Furkan; Aydın, Mevlüt; Korkmaz, Habip Gökay; Gökcepınar, Ömer Faruk; Türköz, Mevlüt; İlbeyli, Harun MertTi-6Al-4V alloy sheet is an engineering material that is widely used due to its superior properties such as high strength-to-density ratio besides high temperature and corrosion resistance. However, its low formability at room temperature limits its wider applications. In this study, a cylindrical cup was hydroformed using a female die to examine how the pulsating effect would result under frictional conditions. Initially, finite element simulations were performed to design a proper die geometry. Next, forming tests were run on Ti-6Al-4V blanks under pressure increased monotonically and with pulsation, and microstructural analyses were performed on the formed specimens. The effects of pulsation frequency, amplitude, and base pressure on the formability were investigated. The nose radius/thickness ratio, maximum thinning, bursting pressure, and die-filling ratio measured on the specimens formed under monotonic and pulsating loadings were compared, and the improvement in the formability was demonstrated. An increase of 38.5 % in bursting pressure occurred and the nose radius of the part was decreased up to 30 % with pulsating loading. The die-filling ratio was improved from 87.9 % to 95.3 % with optimized pulsation parameters. The underlying microstructural reasons for the improved formability were elaborated using XRD, SEM, and TEM analyses. © 2023 Karabuk UniversityConference Object Investigation of Cutting Tool Overhang Length Effect on Surface Roughness of Ggg70 Cast Iron(2021) Aydın, Mevlüt; Türkoz, MevlutIn machining processes, in order to obtain good surface qualities, it is very important to choose the cutting tool and cutting conditions. In addition, the rigidity of the cutting tool and workpiece fixture systems also majorly affects the surface quality. Numerous studies have been investigated the effect of cutting speed, feed and cutting depth parameters on the machining process. However, there are more limited studies investigating the effect of cutting tool overhang length. In this study, the effects of cutting tool overhang length on the surface roughness of austempered GGG70 cast iron material were investigated in the milling process. In this context, cutting speed, feed rate, cutting depth and number of passes were kept constant and milling was carried out at cutting tool overhang lengths of 2, 2.5, 3, 3.5, 4, 4.5 and 5 times the tool diameter (16 mm). The milling experiments performed with three repeated. As a result of experiments, the surface roughness obtained of 0.383 µm at 32 mm tool overhang length. The surface roughness increased to 0.547 at 80 mm tool overhang length. So, the surface roughness increased by 42.6% with the increase of the tool overhang length. In addition to the critical parameters, it has been observed that parameters such as tool overhang have a significant effect on the surface roughness.
Research Topics
Domains
Physical Sciences
Fields
EngineeringEnvironmental Science
Subfields
Mechanical EngineeringMechanics of MaterialsEcological Modeling
Specific Research Areas
Advanced machining processes and optimization
Metal Forming Simulation Techniques
Metallurgy and Material Forming
Erosion and Abrasive Machining
Surface Treatment and Residual Stress
Sustainable Development Goals
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
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Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 12 |
| Yıldız Technical University | 5 |
| Necmettin Erbakan University | 3 |
| Tarsus University | 3 |
| Niğde Ömer Halisdemir Üniversitesi | 2 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Konya mühendislik bilimleri dergisi (Online) | 2 |
| Engineering Science and Technology, an International Journal | 1 |
| Gazi Mühendislik Bilimleri Dergisi | 1 |
| International Journal of Advanced Manufacturing Technology | 1 |
| Journal of Advances in Manufacturing Engineering | 1 |
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Scholarly Output
12
Articles
9
Views / Downloads
27/109
Supervised MSc Theses
1
Supervised PhD Theses
0
WoS Citation Count
12
Scopus Citation Count
13
Patents
0
Projects
0
WoS Citations per Publication
1.00
Scopus Citations per Publication
1.08
Open Access Source
9
Supervised Theses
1
Scopus Quartile Distribution
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