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Öğe Araçlarda kullanılan fren diskinin sonlu elemanlar yöntemiyle hasar analizi(Batman Üniversitesi, 2021-11) Adin, Hamit; Adin, Mehmet Şükrü; Akgül, SabahattinBir taşıtın şüphesiz en önemli kısımlarından bir tanesi fren sistemidir. Fren sistemleri, motorlu taşıtların yavaşlamasını ve durmasını sağlayan düzeneklerdir. Bir araçta fren sistemi ne kadar kuvvetli ve tesirliyse o taşıt da o kadar güvenlidir. Bilinçli tüketiciler araç tercihinde bulunurken aracın nasıl gittiğinden veya konforundan ziyade ne şekilde durduğuyla da ilgilenir. Eğer giden araç hızlı v e güvenli bir şekilde durma sağlayamıyorsa o markayı tüketici güvenli bulmaz ve tercih etmez. Böylece tüketici başka güvenli araçlara yönelim sağlar ve onları tercih eder. Günümüzde üretilen bütün yeni nesil modern araçlar fren sisteminde diğer fren çeşitlerinden ziyade disk frenleri tercih etmektedir. Fren diskleri taşıtların fren sisteminde bulunur. Bu diskler taşıtların düzgün yavaşlamasına yarayan fren sistem in in önemli parçalarından biridir. Disk fren sistemleri frenlemeyi kaliper ve balatalar arasındaki diski sıkmak suretiyle frenlemeyi sağlayan bir sistemdir. Bu çalışmada, kullanımı neticesinde hasar almış bir adet fren diski piyasadan tem in edilmiştir. Hasarlı olan ve çeşitli aşınmalara maruz kalmış olan bu fren diski incelenmiştir. Kırılma ve aşınma nedenleri araştırılmış ve sonlu elemanlar yöntemi kullanılarak analiz edilmiştir. Solidworks paket programı kullanılarak parça modellemesi yapılmıştır. Modellenen bu fren diski ANSYS paket programı kullanılarak analiz edilmiştir. Bu analiz sonucunda Fren diskinde meydana gelen hasarın nedenleri bulunmuştur.Öğe Numerical investigation of fatigue behavior of non-patched and patched aluminum/composite plates(Ahmet ÇALIK, 2021-12-20) Adin, Hamit; Sağlam, Zeyni; Adin, Mehmet ŞükrüIn this study, the fatigue behavior of composite patched and non-patched Al 5083 aluminum plates was numerically investigated. Al 5083 Aluminum plates with semi-circular notched (2, 3 and 4 mm long cracked) and "V" notched (30°, 45° and 60° angled) were used in the analyzes. Mechanical properties of Al 5083 Aluminum plate, DP460 type adhesive of produced by 3M and [0°]8 glass fiber reinforced composite patch material was used for the study. The Finite Element Method was applied for numerical study. Numerical analyzes were performed with the Ansys version 15.0 Workbench Package program. As a result of the numerical study, the highest fatigue life (1593.2 N) is seen on the 30° angled "V" notched and patched specimen. However, the fatigue life in non-patched specimen (30° angled "V" notched) was found to be 277.69 N. Thus, the study revealed that the composite patch's contribution is very important.Öğe Optimization of process parameters of medium carbon steel joints joined by MIG welding using Taguchi method(European Mechanical Science, 2022-03-20) İşcan, Bahattin; Adin, Mehmet ŞükrüIn this study, related to getting better obtain to the mechanical properties of medium carbon steel joints joined by MIG welding method using the Taguchi method welding groove were optimized. Grove angle (60ᵒ, 75ᵒ and 90ᵒ), current (100 A, 110 A and 120 A) and voltage (25 V, 30 V and 35 V) were used as welding parameters. The results showed that the highest tensile strength as 597.963 MPa was obtained at groove angle 90ᵒ, current 120 A and voltage 30 V, the lowest tensile strength was obtained as 395.125 MPa. The highest elongation as 11.551% was obtained at groove angle 90ᵒ, current 120 A and voltage 30 V, the lowest elongation was obtained as 8.354%. In addition, it was observed that the changes in current and voltage values significantly affect the tensile strength and elongation values of the joints. According to ANOVA analyses, the most effective parameter on average tensile strength and elongation were determined to be groove angle (62.75% and 75.58%, respectively). Based on S/N ratios, the optimal parameters for average tensile strength and elongation were determined A3B3C2 factors.Öğe Effect of using bioethanol as fuel on start-up and warm-up exhaust emissions from a diesel power generator(Taylor & Francis, 2021-09-01) Altun, Şehmus; Adin, Mehmet Şükrü; Adin, Muhammed ŞakirThe present work investigates the effects of bioethanol as fuel additive on a diesel power generator’s exhaust emission (especially under transient conditions) characteristics, during the start-up followed by idling and warm-up periods, from no load to loaded cases up to 50% at ambient conditions. Experiments with diesel/bioethanol blends in 10% and 15% proportions (denoted as BE10 and BE15, respectively) were achieved in a diesel power generator following the practical operating conditions of the gen-sets. Regarding emissions, CO increased first when bioethanol is used during start-up at no load, then it starts to decrease by increasing bioethanol fraction in diesel and load applied. Unburnt HC emissions were also measured as highest for all fuels tested during start-up, while they were slightly higher for BE15 than others in the rest of the test. NOx was highest with petroleum diesel, while it was lowest with BE15 at start-up. Despite higher NOx was measured with BE10, those of petroleum diesel and BE15 were similar during warm-up together with applying load. Smoke opacity was lowest in BE15; however, BE10 was highest. By applying load, it increased and the highest NOx was measured with BE10, while the lowest was with BE15.
