Yazar "Erdin, Muhammed Emin" seçeneğine göre listele

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    Cam elyaf takviyeli PA 6.6 nın enjeksiyon prosesinin simülasyon yoluyla analizi
    (Hitit Üniversitesi Fen Bilimleri Enstitüsü, 2014) Kocabaş, Gazi Başar; Erdin, Muhammed Emin
    Makina elemanları imalatı, otomotiv yedek parçaları, inşaat, mekanik tesisat ve kimya sektörü gibi pek çok alanda yaygın olarak kullanılan plastiklerin sanayideki kullanım alanları her geçen gün artmaktadır. Yüksek darbe dayanımına ve kimyasal dirence sahip olan plastik malzemelerin cam ve karbon elyafı gibi malzemelerle takviye edilmesi sayesinde mekanik özelliklerinin iyileştirilmesi, plastiklerin kullanım alanlarının ve kullanım oranlarının artışına katkı sağlamaktadır. Plastik enjeksiyon kalıplama plastikler için en yaygın imalat yöntemidir. Enjeksiyon aşamaların herbirinin etkin şekilde uygulanması plastik enjeksiyon kalıplama işleminin veriminin ve elde edilen ürünlerin kalitesinin artırılması açısından son derece önemlidir. Bu çalışmada, otomotiv yan sanayiinde kullanılan bir ara soğutma sistemine ait cam elyaf takviyeli polyamid (PA) 6.6 matrisli bir kazanın plastik enjeksiyon kalıplama ile imalatının simülasyon yolu ile analizi gerçekleştirilmiştir. Bu amaçla öncelikle plastik enjeksiyon kalıplama işlemine ait giriş ve çıkış parametreleri ortaya koyulmuştur. Daha sonra enjeksiyon süresine bağlı olarak enjeksiyon sonrası parçadaki basınç dağılımı, sıcaklık artışı, maksimum kayma gerilmesi bölgeleri ve değeri, kayma oranı, donmuş tabaka oranı, soğuma süresi, çökme izleri, dolum kolaylığı ve çevrim süresinin değişimi sonlu eleman analizleri ile incelenmiştir. Sonuçlar değerlendirilerek uygun enjeksiyon şartları belirlenmiştir.
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    Deep drawing of polymer coated metal sheets
    (Korean Society of Mechanical Engineers, 2019) Erdin, Muhammed Emin; Özdilli, Özgür
    In the present study, the deep drawing of polymer coated metallic sheets were experimentally investigated to reduce friction and increase manufacturing efficiency without using a lubricant. Coating of metal sheets with a polymer material before the deep drawing process provides numerous other advantages such as long service life, decorative appearance, corrosion protection, prevention of excessive abrasion. In the experiments, deep drawing ratio, blank holder pressure, and punch speed parameters were varied at various intervals and the obtained values were evaluated via graphs. Experiments of the uncoated metal sheets were conducted as well as the coated ones to compare the results. Results of this study showed that the polymer coating improved the surface quality of the test specimens. As a result of this improvement; the average molding forces decreased, obtained deep drawing ratios increased and defects such as tearing and wrinkling were alleviated by coating metal sheets with polymer material compared to uncoated sheets. © 2019, KSME & Springer.
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    Effect of coating material on wear in internal gears
    (Materials and Energy Research Center, 2017) Tunalıoğlu, Mert Şafak; Tuç, Bedri; Erdin, Muhammed Emin
    Theoretical and experimental investigation of wear during coupling in internal gears coated with various polymeric coating materials was performed in this study. In the theoretical part of the study, Archards' wear formulation was adapted to internal gears and wear behavior in various conditions was determined. Moreover, a fatigue and wear testing apparatus having similar working principle with FZG (Forschungsstelle für Zahnrader und Getreibbau) closed circuit power circulation system was designed and manufactured to experimentally investigate the wear in internal gears. Internal gear-pinion couples manufactured from St50 material were coated with various polymeric materials, namely PTFE (polytetrafluoroethylene), MoS2 bonded with polyamide, MoS2 bonded with epoxy in the experimental study. An uncoated internal gear was also investigated to find out the performance of coated gears. Variation of wear depth on tooth profiles of internal gears were determined theoretically and experimentally. Theoretical and experimental studies showed that polymeric coated internal gears have more wear resistance than uncoated ones by means of high lubrication ability and low friction coefficient of coating materials. It was also observed that high corrosion resistance of polymeric coatings protected metallic surfaces and decreased corrosive wear.
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    Effects of holding force on the springback behavior of annealed aluminum plates
    (Elsevier Ltd, 2016) Erdin, Muhammed Emin; Atmaca, Alper
    Typical V-bending process was performed to investigate the effects of holding force on springback behavior of 1050-H14 aluminum alloy plates annealed at 120 °C for 20 minutes. Tests were conducted on a universal testing machine with 60° V-bending mold. Various holding forces (2.25 kN which is slightly higher than the required force for bending operation, 5 kN, 10 kN and 15 kN) were applied at the end of the bending processes to investigate the hardening effect on springback values. The test results showed that annealing decreases springback values in all anisotropy directions. It is also clear from the test data that application of holding force has a significant affirmative effect on springback values. © 2016 The Authors. Published by Elsevier ltd.
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    Elektro Erozyon ile İşlemede İşleme Haznesine Uygulanan Titreşimlerin Geometrik Elektrot Aşınması Üzerindeki Etkilerinin İncelenmesi
    (2018) Özgedik, Ali; Balcı, Sadık Mert; Erdin, Muhammed Emin; Kopraman, Yağmur
    Bu çalışmada, Elektro Erozyon ile İşleme (EEİ) tekniğinde işleme haznesine uygulanan titreşimlerin elektrot köşe aşınma geometrisi ve performans çıktıları üzerindeki etkilerinin incelenmesi için titreşim frekansı, boşalım akımı ve vurum süresi gibi farklı işleme koşullarında deneyler yapılmıştır. İşleme haznesi titreşimli (İHT-EEİ) deneylerde titreşimsiz koşullara göre elektrot aşınma hızı (EAH) ve bağıl aşınma (BA) değerleri azalmıştır. Deneysel sonuçlara göre işleme haznesine uygulanan titreşimler elektrot köşe yarıçap değerlerinde azalmaya neden olmuştur.
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    Experimental investigation of the axial crushing behavior of aluminum/CFRP hybrid tubes with circular-hole triggering mechanism
    (ELSEVIER SCI LTD, 2023) Çetin, Erhan; Baykasoğlu, Adil; Erdin, Muhammed Emin; Baykasoğlu, Cengiz
    The current study investigates the axial crushing behavior of filament-wound aluminum/carbon fiber reinforced plastic (Al/CFRP) hybrid tubes with circular-hole triggering mechanism. The proposed hybrid design consists of an inner aluminum thin-walled tube and an outer composite winding of three plies having 30???30??90? angles. The diameter, number, and location of the triggering holes were chosen as design parameters, and Taguchi L9 orthogonal array experimental design was used to find the best configuration of design parameters. For the optimization of multiple responses, Additive Ratio Assessment (ARAS) has also been utilized along with mono-criteria optimization. The experimental results showed that the intact hybrid tube can absorb up to 50% higher crush energy compared with the sum of individual components of the structure. The progressive brittle fracture pattern accompanied by progressive local buckling mode exhibiting favorable energy absorption characteristics were observed in all triggered configurations. Analysis of variance results showed that the trigger location ratio has the most significant effect on the specific energy absorption while the hole diameter was the most significant factor in decreasing the peak crush force. The results revealed that the specific energy absorption and the crush force efficiency of the intact hybrid tubes can be enhanced up to 39.1% and 61.7%, respectively, by the use of optimal levels of design parameters
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    Quasi-static axial crushing behavior of thin-walled circular aluminum tubes with functionally graded thickness
    (Elsevier Ltd, 2016) Erdin, Muhammed Emin; Baykasoğlu, Cengiz; Tunay Çetin, Merve
    In this paper, the crushing behavior of circular aluminum thin-walled tubes with functionally graded thickness (FGT) are investigated experimentally. To this aim, three different thickness grading patterns are introduced to the longitudinal direction of tubes using a grading function, and then specimens are tested by universal testing machine under quasi-static axial compression loading. In addition, to show the efficiency of FGT tubes, the quasi-static axial crushing performance of FGT tubes are compared with their uniform thickness (UT) counterparts at the same weight. The test specimens have been made of commercial quality 6060 aluminum alloy and manufactured with computerized numerical controlled (CNC) machining workbench. Initial crush force (ICF), total energy absorption (EA), specific energy absorption (SEA) and mean crush force (MCF) values are measured from the tests to infer the quasi-static axial crushing performance of the tubes. The test results showed that the energy absorption characteristics of FGT tubes are better than the UT counterparts and FGT tubes allow effective control of the energy absorption parameters when compared with the UT tubes due to their varying stiffness along their longitudinal direction. © 2016 The Authors. Published by Elsevier Ltd.