Profile URL: https://hdl.handle.net/20.500.13091/11801
Job Title:Dr. Öğr. Üyesi
Email Address:osmanozturk@ktun.edu.tr
Main Affiliation:02.10. Department of Mechanical Engineering
Status: Current Staff
ORCID:
0000-0002-2814-6867
0000-0002-2814-6867YÖK Akademik: 471C0429B6B531A3
Google Scholar:
Z4XI0yoAAAAJ
Z4XI0yoAAAAJName Variants:
Ozturk, Osman Özturk, Osman
11 results
Scholarly Output Search Results
Now showing 1 - 10 of 11
Other Machinability Analysis Of Delamination and Thrust Force in Drilling of Pure and Added GFRP Composites(2021) Ünüvar, Ali; Öztürk, OsmanAbstract The aim of this work is to define the cutting conditions that allow the drilling of added glass fiber reinforced epoxy composite materials by taking into consideration the exit delamination factor, thrust force and the optimum combination of drilling parameters. The experiments were carried out under two cutting parameters such as cutting speed and feed rate for three levels each. Taguchi experimental design is used to reduce the excessive number of experiments. The experiment design was accomplished by application of the statistical analysis of variance (ANOVA). Correlations between cutting speed/feed rate and the various machining parameters were established to optimize cutting conditions. These correlations were found by quadratic regression using response surface methodology (RSM). Multiple regression analysis (MRA) was also employed to establish parametric relationships between the experimental parameters and the machinability outputs consisting of delamination and thrust force. The machinability refers to the relative ease or difficulty under certain cutting conditions. Therefore, it is very important to understand the factors affect the machinability and to evaluate their effects. Machinability of GFRP composites was enquired. It is aimed to evaluate the machinability of these materials. A machinability index has been developed in current study.Article Citation - WoS: 2Citation - Scopus: 3Machinability Analysis of Delamination and Thrust Force in Drilling of Pure and Added Gfrp Composites(Sage Publications Ltd, 2022-11-02) Ünüvar, Ali; Özturk, OsmanThe effects of cutting parameters on the thrust force and delamination factor in the drilling of pure, Al2O3, and SiO2 added GFRP/epoxy composites were investigated. Experimental studies were performed to investigate thrust force and delamination factor. Taguchi experimental design and response surface methodology were employed to establish parametric relationships between the experimental parameters and the machinability outputs consisting of delamination and thrust force. When examining the effect of cutting speed and feed on thrust forces and delamination factors for the three materials, the smallest values of the cutting parameters for all three materials gave the minimum thrust forces and delamination factors. Machinability Index is also proposed. According to the machinability index, under the effect of delamination and thrust force parameters, it was seen that pure epoxy composite material has better machinability than the other composite materials. It has been found that the effect of feed rate on delamination is greater than the cutting speed, and the cutting speed has a low effect.Article Investigation of Erosion Wear Behavior and Incubation Period of 3D-Printed ABS, PLA and Nylon-CF(Emerald Group Publishing Ltd, 2025-12-11) Aydin, Mehmet Esat; Ozturk, Osman; Bagci, MehmetPurposeThis study aims to investigate the erosion wear behavior of three-dimensional (3D)-printed Acrylonitrile Butadiene Styrene (ABS), Polylactic acid (PLA) and Nylon-CF (Nylon Carbon Fiber) parts with jet impingement test using alumina (Al2O3) particles. The effects of build orientation and impingement angle on erosion wear behavior were investigated.Design/methodology/approachABS, PLA and Nylon test specimens with build orientations of 0 degrees, 45 degrees and 90 degrees were fabricated using a 3D printer. Erosion wear tests were conducted on these specimens at impingement angles of 30 degrees, 60 degrees and 90 degrees. The erosion wear rate was determined by measuring the weight loss. EDX analysis and SEM images were obtained to find the wear characteristics.FindingsThe build orientation affected the wear resistance of ABS slightly, whereas the orientation caused more significant differences in PLA and Nylon-CF. On the other hand, 90 degrees-oriented Nylon-CF composite gained mass, unlike other materials. From this point on, the incubation period specific to the composites was investigated by gradually increasing the amount of abrasive. The abrasive mass up to 5,000 g eventually finalized the incubation period and stabilized the weight loss of Nylon-CF. EDX results and SEM images were interpreted together, proving that the mass gain in Nylon-CF was due to the embedding of alumina particles in the matrix.Originality/valueThis study contributed to the literature to better understand the erosion wear behavior of the most used polymer-based materials produced with 3D printing. The incubation period detected in the Nylon-CF sample, which was found to be due to particle embedding, added another originality.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.Article Citation - WoS: 5Citation - Scopus: 5Formability Improvement in Ti-6al V Sheet at Room Temperature by Pulsating Hydraulic Bulging: Experimental and Numerical Investigations(Springer London Ltd, 2022-12-20) Öztürk, Osman; Korkmaz, Habip G.; Ataş, Gürkan; Aydın, Mevlut; Türkoz, Mevlut; Toros, Serkan; Dilmeç, Murat; Halkaci, H. SelçukTi-6Al-4 V sheets possess limited formability at room temperature due to low ductility with almost no strain hardening. Pressure pulsation during hydroforming may bring significant improvement as an alternative to the widespread solution hot forming. However, much uncertainty exists on the deformation mechanism and effects of pulsating on difficult-to-form materials. In this study, the effect of pulsating pressure on the hydraulic bulge test was investigated to increase the limited formability of the Ti-6Al-4 V sheet at room temperature. Experimental results of thickness distribution and bulge height obtained from the bulge tests were compared with the finite element simulation results. The results show that the tests with pulsation allow a higher thickness reduction with a slightly more homogenous thickness distribution. Pulsation causes a delay in the material's failure resulting in a 15.4% increase in the dome height with a 17% increased burst pressure compared to monotonic loading. The underlying microstructural phenomena of increased formability were elaborated using dislocation estimations, fracture surface analysis, and hardness. Test results suggest that pulsation improves formability by 47% in terms of maximum elongation due to stress relaxation.Article Design, Fabrication and Performance Tests of a Double-Sided Sheet Hydroforming Test System(Natl Inst Science Communication-Niscair, 2023) Urmamen, Mustafa Kemal; Ataş, Gürkan; Dilmeç, Murat; Türköz, Mevlut; Özturk, Osman; Halkacı, Hüseyin SelçukIn this study, a double-sided sheet hydroforming (DSH) test system, which contains dies, sealing, pressure intensifiers, and a control unit, has been designed, built, and tested. The hydraulic numerical control system, which is currently used, has been modified as afour-axis where parameters are forming pressure, back pressure, punch position, and blank holder force. A hydromechanical deep drawing press has been modified in terms of die and sealing. New sealing components have been used to prevent leakage during the forming process because one side of the sheet is exposed to the forming pressure, and the other side is exposed to both the back pressure and the moving punch. Performance tests have been carried out to determine the limitations and capacity of the system. After the performance tests, it has been concluded that; the higher forming rates all along the process curve, the higher the pressure and force differences. However, the resultant error of the corresponding points has been only higher at the beginning of the process curve. In addition, the higher slopes in process curves have increased the pressure and force differences. A conical industrial part has been deformed by using hydromechanical deep drawing and DSH processes to test the performance of the DSH press. The wrinkling defect that occurred in previous hydroformed parts has been reduced remarkably by using back pressure in the DSH process. As a result, a double-sided sheet hydroforming test press has been successfully designed and manufactured. Finally, this study provides technical knowledge and can be used as a guideline for the design and performance evaluation of similar manufacturing systems.Article Parametric Optimization of Structural Frame Design for High Payload Hexacopter(2024-09-15) Öztürk, OsmanFor drones, the use of which has been increasing recently for load carrying, lightweight drone frame design is significant for increased flight time and payload capacity. Drones are produced in different configurations with three, four, or six rotors, and in different sizes depending on the purpose of use. While agility is more important in three and four rotor drone applications, six-rotor and relatively large-bodied drones are preferred in cases such as load carrying. When the body structure has to be large, lightening the design becomes very critical. Lightweight designs can be achieved by two commonly used methods for structural optimization: topology optimization and parametric optimization. Topology optimization is an advanced method that can significantly reduce weight but is expensive and time-consuming. Parametric optimization is a more practical approach to conventional manufacturing methods and was used in this study. This study aims to first simplify the hexacopter frame model and define key geometric parameters for mass-decreasing optimization. Finite element analysis simulations were used to evaluate the strength and deformation of the frame under various design scenarios. The results showed that parametric optimization successfully reduced the weight of the hexacopter frame while maintaining structural integrity. The maximum Von Mises stress was found as approximately one quarter of the yield strength of the frame material. The maximum total deformation was achieved below 0.3 mm, and deformation under 1 mm is considered safe in the literature. As a result, the optimized design offers a lighter drone structure in line with conventional manufacturing methods, providing better flight time and payload capacity while maintaining cost effectiveness. In future studies, comparisons can be made based on this study by performing weight optimizations suitable for current methods such as topology optimization or generative design. The cost factor and the availability of existing production lines should be taken into consideration when comparing the mentioned methods with parametric optimization.Article 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.Book Part Anwendung Des Bienenalgorithmus Auf Pulsierendes Hydroforming(2024) Şen, Muhammed Arif; Öztürk, Osman; Halkacı, Hüseyin Selçuk; Kalyoncu, MeteArticle Citation - WoS: 7Citation - Scopus: 7Microstructural Characterization of Improved Formability of Ti-6al Sheet by Pulsating Hydraulic Bulging at Room Temperature(Springer, 2022-10-20) Yapan, Yusuf Furkan; Öztürk, Osman; Türköz, Mevlut; Dilmeç, Murat; Livatyali, Haydar; Halkacı, Huseyin Selçuk; Kotan, HasanThis study aims to increase the limited formability of the Ti-6Al-4V sheet at room temperature using the pulsating hydraulic bulging and to investigate the microstructural reasons for the increased formability. Accordingly, monotonic and pulsating hydraulic bulge tests (HBTs) were applied to Ti-6Al-4V sheets with 0.55 mm thickness at room temperature, and the underlying microstructural reasons for the improved formability were investigated by conducting detailed microstructural characterizations. The experimental results showed that the pulsating HBT samples reached 15.4% higher bulge dome height than the monotonic HBT samples, and a more homogeneous thickness distribution was achieved by pulsating bulging. The thickness and microhardness distributions, dislocation density estimations, and fracture surface analysis were utilized to correlate the increased formability with the microstructure. It was determined that stress relaxation occurred during the pulsating HBT, resulting in the achieved improved formability. The decrease in the dislocation density in the early stage of forming prevented the locking of the dislocations and delayed the occurrence of the damage, i.e., leading to the increased bulge dome height. The higher plastic deformation resulting from the increased formability also increased the hardness along the cross-section. The increased formability of the Ti-6Al-4V sheet during the pulsating HBT and the underlying microstructural phenomena elaborated in this study are expected to make significant contributions to the current literature on the sheet metals with limited formability at room temperature.
Research Topics
Domains
Physical Sciences
Fields
Engineering
Subfields
Mechanical EngineeringMechanics of MaterialsBiomedical EngineeringElectrical and Electronic Engineering
Specific Research Areas
Metal Forming Simulation Techniques
Metallurgy and Material Forming
Advanced Surface Polishing Techniques
Advanced machining processes and optimization
Advanced Machining and Optimization Techniques
Sustainable Development Goals
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
2
Research Products
This researcher does not have a Scopus ID.
This researcher does not have a WoS ID.
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 10 |
| Necmettin Erbakan University | 4 |
| Yıldız Technical University | 3 |
| Tarsus University | 2 |
| Niğde Ömer Halisdemir Üniversitesi | 2 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Black Sea Journal of Engineering and Science | 1 |
| Engineering Science and Technology, an International Journal | 1 |
| Indian Journal of Engineering and Materials Sciences | 1 |
| International Journal of Advanced Manufacturing Technology | 1 |
| International Journal Of Advanced Manufacturing Technology | 1 |
Current Page: 1 / 2
Scholarly Output
11
Articles
9
Views / Downloads
24/0
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
19
Scopus Citation Count
22
Patents
0
Projects
0
WoS Citations per Publication
1.73
Scopus Citations per Publication
2.00
Open Access Source
4
Supervised Theses
0
Scopus Quartile Distribution
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