Yazar "Tunçel, Oğuz" seçeneğine göre listele

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    EYM ile Üretilen YMK Yapılı Numunelerde Kenar Genişliğinin Basma Dayanımı Üzerine Etkisinin Araştırılması
    (2023) Tunçel, Oğuz; Tutar, Mumin
    Bu çalışmada, 3 boyutlu baskı (3D printing) kullanılarak üretilen farklı kenar genişliklerine sahip yüzey merkezli kübik YMK yapılı numunelerin basma dayanımı üzerindeki etkisi incelenmiştir. PLA malzemesi kullanılarak Eriyik Yığma Modellemesi (EYM) yöntemi ile numuneler üretilmiştir. Kenar genişliği arttıkça, maksimum basma yüklerinde ve basma dayanımlarında artışlar gözlenmiştir. En düşük yük 1,2 mm kenar genişliğinde 2849 N iken, en yüksek yük 2,4 mm kenar genişliğinde 6351 N olarak ölçülmüştür. Benzer şekilde, en düşük basma gerilimi 34,76 MPa ile 1,2 mm kenar genişliğinde, en yüksek basma gerilimi ise 40,15 MPa ile 2,4 mm kenar genişliğinde kaydedilmiştir. Kenar genişliğinin artmasıyla birlikte maksimum yük/kütle değeri %33,1 oranında artış göstermiştir. Sonuçlar, 3D baskı üretiminde kenar genişliğinin tasarım faktörü olarak önemini vurgularken, daha geniş kenar genişliklerinin ürünlerin mekanik dayanıklılığını artırabileceğini ve uygulama gereksinimlerine uygunluğunu sağlayabileceğini göstermiştir.
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    Optimization of Nd:YAG Laser Welding Factors of Cold Rolled Strenx 700 CR Steel by Taguchi Method
    (2023) Tunçel, Oğuz; Aydın, Hakan
    In this study, cold rolled Strenx 700 CR steel with a minimum yield strength of 700 MPa, which is typically used in load bearing structures to produce stronger and lighter structures, is butt welded with Nd:YAG laser welding. The effect of welding factors on tensile strength is investigated by using laser power rate (20%, 40% and 60%), pulse duration (2, 4 and 6 ms) and pulse frequency (3, 5 and 7 hz). By using Taguchi L9 orthogonal experimental design, the number of experiments, which should be 27 when full factorial, is reduced to 9 experiments. The tensile strength test results are optimized by the Taguchi method's larger is better control characteristic. The optimum test combination for maximum tensile strength is determined as A3B2C2 (60%-4 ms-5 hz). The effect of the welding factors on the tensile strength results is analyzed using the analysis of variance (ANOVA) method and it is found that the most effective factor is the laser power rate with 84.26%.
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    Optimizing printing parameters for enhanced mechanical properties of 3D printed PLA octet lattice structures
    (2023) Tunçel, Oğuz
    3D printers, known as one of the rapid prototyping methods, are used in research and academic studies as well as industry. This technology makes it easy and fast to produce a preliminary prototype of a design. This study explores the impact of printing parameters on the mechanical properties of 3D-printed octet lattice structures using PLA material. Focused on optimizing layer thickness, print speed, and infill density, the study employed Taguchi methodology. Compressive strength and strength per mass were the key metrics analyzed. The optimized parameters, determined as 0.2 mm layer thickness, 90 mm/s print speed, and 100% infill density, significantly enhanced compressive strength. Infill density emerged as the most influential factor, contributing to 82.75% of the overall variation. A robust predictive model was developed, achieving a 92.06% accuracy in estimating compressive strength per mass values. These findings provide crucial guidelines for manufacturing high-strength, lightweight PLA octet lattice structures, vital in industries like aerospace and automotive. This study advances additive manufacturing, opening avenues for further research in diverse lattice structures and materials.
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    THE APPLICATION OF THE TAGUCHI METHOD FOR OPTIMIZING THE COMPRESSION STRENGTH OF PLA SAMPLES PRODUCED USING FDM
    (2024) Tunçel, Oğuz; Bayraklılar, Mehmet Said
    In this study, the Taguchi method was applied to optimize the compressive strength of PLA samples produced using Fused Deposition Modelling (FDM). The study used Taguchi L9 experimental design to optimize three different process parameters (wall thickness, filling pattern, and printing speed). S/N ratios and ANOVA methods were used to analyze the experiments. The results of the experiments using the Taguchi technique were analyzed according to S/N ratios and the parameter levels with the best results were determined. The best levels for wall thickness, filling pattern, and print speed parameters were determined and the effects of these parameters were analyzed. It was concluded that wall thickness was the most effective parameter and filling pattern and print speed were less effective. ANOVA analysis confirmed the influence of the parameters on the compressive strength. It was observed that wall thickness contributed the most (70.20%) and filling pattern contributed the second most (29.11%).
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    The influence of the raster angle on the dimensional accuracy of FDM-printed PLA, PETG, and ABS tensile specimens
    (2024) Tunçel, Oğuz
    3D printing is a rapidly advancing method in digital manufacturing techniques and produces objects in layers. Fused Deposition Modelling (FDM) is a 3D printing technology where the material is melted in a hot nozzle and then placed on a build platform to create a prototype layer by layer. In this study, the effects of different raster angles (0°, 45°, 90°, 45°/-45°, 0°/90°) on dimensional accuracy for PLA, PETG and ABS materials produced using FDM were investigated. The results show that PETG generally shows higher dimensional deviations compared to PLA and ABS, and samples with a scan angle of 90° generally have lower deviation percentages than other angles. Width deviations (approximately 1.5% on average) were lower than thickness deviations (approximately 9.5% on average). Analysis of the cross-sectional areas shows that all samples are above the theoretical area (41.6 mm2). PETG samples with a scan angle of 45°/-45° exhibit the largest cross-sectional area (46.78 mm2), while ABS samples with a scan angle of 90° exhibit the smallest (45.46 mm2). This study is important to understand the impact of material selection and raster angle on dimensional accuracy, and it is recommended to account for cross-sectional deviations and calculate the stress based on the actual cross-sectional area to achieve more accurate results in applications requiring precise measurements. These data offer valuable information for those interested in 3D printing and its professionals and can lead to further research in this field, so that printing techniques can be further developed and product quality can be improved.