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8. A numerical and theoretical investigation into torsional buckling of composite driveshaft incorporating carbon nanotube.

Author

TAŞ, Hamza

Subjects
CARBON nanotubes, MICROMECHANICS, LAMINATED materials, EPOXY resins, FINITE element method
Abstract

Composite driveshafts have emerged as a potent substitute for traditional driveshafts because of their excellent strength-to-weight and stiffness-to-weight ratios. At the same time, usage of multi-walled carbon nanotubes (MWCNTs) as a reinforcement has gained a great momentum due to their superb mechanical, electrical, and thermal characteristics. In this work, a micromechanical model combining the rule of mixtures and the Halpin-Tsai (H-T) model was used to calculate elastic constants of MWCNTs-added carbon fiber reinforced epoxy resin. This micromechanical model considers the effect of agglomeration, aspect ratio, waviness, and random orientation of MWCNTs. Elastic constants of MWCNTs/epoxy resin calculated by using micromechanical model was compared by experimental results available in the literature. Moreover, finite element analysis (FEA) was carried out to predict the critical torsional buckling load of composite driveshafts for various MWCNTs concentrations and fiber orientation angles. The FEA results were compared with the results obtained theoretically. The results showed that Young's modulus of MWCNTs/epoxy resin calculated by using the micromechanical model follows the experimental findings. When compared to pure carbon fiber-reinforced epoxy resin, E1, E2, E12, and G23 (elastic constants of composite lamina) showed improvements of 0.66%, 27.80%, 49.02%, and 37.50%, respectively, in the case of 10vol.% MWCNTs addition. The ply orientation angle has a more dominant effect on Tcr than the Doi: 10.24012/dumf.1336638 MWCNTs concentration. [ABSTRACT FROM AUTHOR]

Published
2023
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9. INVESTIGATION USING FINITE ELEMENT ANALYSIS OF EFFECT TO EARRING OF ANISOTROPY PARAMETERS IN DEEP DRAWING PROCESS.

Author

Gök, Kadir, Taş, Hamza, Gök, Arif, and Alkan, Mehmet Ali

Subjects
FINITE element method, ANISOTROPY, MANUFACTURING processes, DURABILITY, METALWORK
Abstract

The investigation mentioned focuses on utilizing finite element analysis to study the impact of anisotropy parameters on the behavior of earrings during the deep drawing process. deep drawing is a manufacturing technique used to transform flat sheet metal into three-dimensional shapes, and anisotropy refers to the directional dependence of material properties. by analyzing and understanding how anisotropy parameters affect the behavior of earrings during the deep drawing process, this investigation aims to provide valuable insights for optimizing the manufacturing process and enhancing the quality and durability of earrings. In this study, an Al6061-T6 sheet material with different planar anisotropies with a single thickness of 2 mm was employed to simulate the effects of anisotropy parameters on the earring by using finite element method. The effects of anisotropy parameters on the earring were examined by using FEM. Variations force obtained in Δr2 are higher than Δr1. This is due to the anisotropy of the material. It can be said that the FEM simulations give reasonable results in view of earring for deep drawing processes. So, experimental costs can therefore be avoided using a suitable FEM model. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Kesme gerilimi altında kalınlaşan sıvı emdirilmiş S2 cam fiber kumaşların düşük hız delinme dirençlerinin araştırılması.

Author

TAŞ, Hamza, SOYKÖK, İbrahim Fadıl, and HALİMİ, Abdul Jamil

Subjects
*GLASS fibers, *POLYETHYLENE glycol, *IMPACT strength, *MOLECULAR weights, *VELOCITY
Abstract

In this study, unlike the studies available in the literature, low velocity puncture resistance and quasi-static puncture resistance of S2 glass fiber fabrics with high strength and impact resistance impregnated with shear thickening fluid (STF) was determined. For this purpose, firstly, a polyethylene glycol 400 (PEG400: 400 g/mole of molecular weight) suspension with the silica loading of 20 wt% was fabricated and then, rheological measurements were carried out. Then, drop weight puncture tests for the drop height of 200 mm, 300 mm and 400 mm and quasi-static puncture tests (6 mm/min of puncture velocity) were applied to neat and STF impregnated fabrics. Damages in fabrics and deformation marks on backing material were discussed in detail. As a result of the rheological tests, it was observed that the PEG400/silica suspension exhibits shear thickening behavior. With the STF impregnation, a decrease of 30.7%, 17.7% and 20.7% was observed in the penetration depth of the penetrator into the backing material for the drop height of 200 mm, 300 mm and 400 mm, respectively. In addition, It has been seen that the impregnation of STF gives more reasonable results in terms of weight increase than increasing the number of fabric layers. As a result of quasi-static puncture tests, neat and STF impregnated fabrics showed close characteristics. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Tabakalı Hibrit Kompozit Profillerin Doğal Frekanslarının Sonlu Elemanlar Metodu ile Belirlenmesi

Author

TAŞ, Hamza and SOYKÖK, İbrahim Fadıl

Subjects
Natural Frequency,Finite Element Method,Hybrid Composite,Composite Profile, Engineering, Doğal Frekans,Sonlu Elemanlar Metodu,Hibrit Kompozit,Kompozit Profil, Mühendislik
Abstract

Inthis work, the natural frequencies of rectangular sectioned glass fiberreinforced composite (GFREC) profiles and of carbon fiber reinforced composite(CFREC) profiles are determined by using the finite element method (FEM) forvarious fiber angles. In the next stage, FEM analyses of rectangular sectioned hybridcomposite profiles formed by stacking GFREC plates and CFREC plates at differentangles and order are carried out. In this way, the effect of the hybridizationon the natural frequency is investigated. In addition, the effect of crosssection aspect ratio, boundary condition and radius on natural frequency of the hybrid compositeprofiles is investigated. As a result, in all modes, the natural frequencies ofthe CFREC profiles are found to be higher than that of GFREC profiles. Thenatural frequencies of hybrid composite profiles are smaller than that of CFRECprofiles, higher than that of GFREC profiles., Buçalışmada ilk olarak, dikdörtgen kesitli cam fiber takviyeli kompozit (CFTK)profillerin ve karbon fiber takviyeli kompozit (KFTK) profillerin doğalfrekansları çeşitli fiber açıları için sonlu elemanlar metodu (SEM)kullanılarak belirlenmiştir. Sonraki aşamada ise, CFTK tabakaların ve KFTKtabakaların birbiri üzerine farklı açı ve sırada istiflenmesiyle oluşturulmuş dikdörtgenkesitli hibrit kompozit profillerin SEM analizleri gerçekleştirilmiştir. Buyolla hibritlemenin doğal frekans üzerine etkisi araştırılmıştır. Ayrıca, yapılananalizlerle hibrit kompozit profillerde kesit en boy oranının, sınır koşulununve köşe radyüsünün de doğal frekansa etkisi araştırılmıştır. Analizlersonucunda, KFTK profillerin tüm modlardaki doğal frekanslarının CFTKprofillerin doğal frekanslarından daha büyük olduğu görülmüştür. Hibritkompozit profillerin doğal frekansları ise, KFTK profillerin doğalfrekanslarından küçük, CFTK profillerin doğal frekansından ise büyüktür.

Published
2018

14. Ejektörlü soğutma çevrimine sahip ev tipi bir buzdolabının tasarımı ve üretimi

Author

Taş, Hamza, Özdamar, Aydoğan, and Makine Mühendisliği Anabilim Dalı

Subjects
Ejector refrigeration systems, Mechanical Engineering, Makine Mühendisliği
Abstract

Bu tezde, ejektörlü soğutma çevrimine sahip ev tipi bir buzdolabının tasarımı ve üretimi üzerine teorik ve deneysel çalışmalar gerçekleştirilmiştir. Bu amaçla, ilk aşamada iki fazlı ejektörün termodinamik incelemesi gerçekleştirilmiş ve elde edilen sonuçlar ile birincil lülesi yakınsak tipte ve birincil lülesi yakınsak-ıraksak tipte olan iki ejektör geometrisi oluşturulmuştur. Bu iki ejektör geometrisi için yapılan testlerde, birincil lülesi yakınsak tipte olan ejektörden emişin olduğu, birincil lülesi yakınsak-ıraksak tipte olan ejektörde ise emişin olmadığı görülmüştür. Bunun üzerine bundan sonraki çalışmalar birincil lülesi yakınsak tipte olan ejektör üzerinde yoğunlaşmış ve bu amaçla birincil lülesi yakınsak tipte olan 6 farklı ejektör geometrisi üretilmiştir.Birincil lülesi yakınsak tipte olan ejektörler için yapılan testler sonucunda, çok az miktarda da olsa hemen hemen tüm ejektörlerde emiş olduğu, buna karşın kabin içerisinde istenilen düzeylerde soğuma etkisine ulaşılamadığı görülmüştür. In this thesis, a theoretical and experimental studies on designing and manufacturing of a domestic refrigerator which has an ejector refrigeration cycle have been carried out. For this purpose, in the first step, thermodynamic evaluation of a two-phase ejector has been done and with the results obtained two ejector geometries that one has convergent type primary nozzle and the other has convergent-divergent type primary nozzle have been formed. In the tests which were carried out for these two ejectors, it has been seen that suction happened for ejector which has a convergent type primary nozzle but suction didn't happened for ejector which has a convergent-divergent type primary nozzle. So, next studies has focused on the ejector which has a convergent type primary nozzle and for this purpose 6 ejectors which has a convergent type primary nozzle has produced.As a results of test for ejectors which has a convergent type primary nozzle, it has been seen that even if just a bit suction has observed for almost all ejectors, but not reached desired level cooling effect in the cabin. 82

Published
2016

15. Designing and manufacturing of a domestic refrigerator which has an ejector refrigeration cycle

Author

Taş, Hamza, Özdamar, Aydoğan, and Fen Bilimleri Enstitüsü

Subjects
Soğuma Etkisi, Birincil Lüle, Cooling Effect, Ejector, Domestic Refrigerator, Primary Nozzle, Ev Tipi Buzdolabı, Soğutma Çevrimi, Cooling Cycle, Ejektör
Abstract

Bu tezde, ejektörlü soğutma çevrimine sahip ev tipi bir buzdolabının tasarımı ve üretimi üzerine teorik ve deneysel çalışmalar gerçekleştirilmiştir. Bu amaçla, ilk aşamada iki fazlı ejektörün termodinamik incelemesi gerçekleştirilmiş ve elde edilen sonuçlar ile birincil lülesi yakınsak tipte ve birincil lülesi yakınsak-ıraksak tipte olan iki ejektör geometrisi oluşturulmuştur. Bu iki ejektör geometrisi için yapılan testlerde, birincil lülesi yakınsak tipte olan ejektörden emişin olduğu, birincil lülesi yakınsak-ıraksak tipte olan ejektörde ise emişin olmadığı görülmüştür. Bunun üzerine bundan sonraki çalışmalar birincil lülesi yakınsak tipte olan ejektör üzerinde yoğunlaşmış ve bu amaçla birincil lülesi yakınsak tipte olan 6 farklı ejektör geometrisi üretilmiştir. Birincil lülesi yakınsak tipte olan ejektörler için yapılan testler sonucunda, çok az miktarda da olsa hemen hemen tüm ejektörlerde emiş olduğu, buna karşın kabin içerisinde istenilen düzeylerde soğuma etkisine ulaşılamadığı görülmüştür., In this thesis, a theoretical and experimental studies on designing and manufacturing of a domestic refrigerator which has an ejector refrigeration cycle have been carried out. For this purpose, in the first step, thermodynamic evaluation of a two-phase ejector has been done and with the results obtained two ejector geometries that one has convergent type primary nozzle and the other has convergent-divergent type primary nozzle have been formed. In the tests which were carried out for these two ejectors, it has been seen that suction happened for ejector which has a convergent type primary nozzle but suction didn't happened for ejector which has a convergent-divergent type primary nozzle. So, next studies has focused on the ejector which has a convergent type primary nozzle and for this purpose 6 ejectors which has a convergent type primary nozzle has produced. As a results of test for ejectors which has a convergent type primary nozzle, it has been seen that even if just a bit suction has observed for almost all ejectors, but not reached desired level cooling effect in the cabin.

Published
2016

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