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    Influence of Nano-CaCO3 Particles on Shear Strength of Epoxy Resin Adhesives
    (2017) Kaybal, Halil Burak; Ulus, Hasan; Avcı, Ahmet
    Epoxy resins are a very common type of adhesive materials in several fields like the automotive industry, marine, probably the most important is in the aerospace industry. Adhesive joints of carbon fiber reinforced epoxy composite laminates are worked using an epoxy resin as the adhesive. In this paper, Adhesive joints were modified nano-CaCO3 in order to enhance the shear strength of epoxy adhesives. The enhancements of shear strength of epoxy adhesive joints reinforced with different nano-CaCO3 particles loading have been studied. The adhesive properties were measured by tensile lap shear test as a function of nano-CaCO3 amount and damaged adhesive surface roughness. Also, the fracture surfaces were examined with Scanning Electron Microscopy (SEM)
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    Karbon nanotüp takviyeli karbon elyaf/epoksi nanokompozit malzemelerin üretilmesi ve delme parametrelerinin incelenmesi
    (Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 2015-01-27) Kaybal, Halil Burak; Avcı, Ahmet
    Kompozit malzemeler uzay, havacılık, taşımacılık ve inşaat gibi birçok alanda üstün özelliklerinden dolayı önem arz etmektedir. Delme işlemi kompozit malzemelerin montajında en önemli son işleme prosesi olarak kullanılmakta ve savunma, havacılık ve otomobil endüstrilerinde oldukça yaygındır. Bu çalışma, karbon elyaf kompozit malzemelerin delme performansı ve delik kalitesini belirlemek için farklı kesme parametrelerinde, kaplamasız sinterlenmiş karbür uç kullanılarak gerçekleştirilmiştir. Delme işlemi 50 m/dk, 67 m/dk ve 90 m/dk kesme hızlarında ve 0.005 mm/dev, 0.05 mm/dev, 0.1 mm/dev, 0.2 mm/dev ve 0.4 mm/dev ilerleme oranlarında yapılan kuru delme deneyinde, iş parçası olarak saf ve nanopartikül katkılı nanokompozit malzeme kullanılmıştır. Kesme parametreleri itme kuvveti, deformasyon faktörü ve yüzey pürüzlülüğü ile ilişkilendirilmiştir. Nanopartikül katkılı kompozit malzemelerde deformasyon faktörü ve yüzey pürüzlülüğü açısından daha iyi sonuçlar alınmıştır. Ayrıca delik yüzeyleri Elektron Taramalı Mikroskop ile görüntülenmiş ve yüzey morfolojileri incelenmiştir.
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    A novelty optimization approach for drilling of CFRP nanocomposite laminates
    (SPRINGER LONDON LTD, 2019) Kaybal, Halil Burak; Unuvar, Ali; Koyunbakan, Murat; Avci, Ahmet
    Numerous problems are encountered in drilling of carbon fiber-reinforced polymer composite materials (CFRP) such as delamination, tool wear etc. Delamination has been recognized as a major damage encountered when drilling composite laminates. In the present study, machinability and the effects of cutting speed and feed rate upon thrust force and delamination formation in carbon nano tube (CNT)-added carbon fiber-reinforced plastics (CFRP) and CFRP were investigated. With this purpose, the experiments were planned. The response surface analysis has been carried out to study the main and the interaction effects of the machining parameters. By using the Taguchi method, cutting parameters' degrees of influence were determined. A new multi-objective optimization for the appropriate drilling process of these composite materials was proposed and an analytical optimization technique was applied. Appropriate cutting parameters of thrust force and delamination factor were found and the optimization results showed that the combination of low feed rate with high cutting speed is necessary to minimize delamination in drilling of CFRP.The machinability refers to the relative ease or difficulty under certain cutting conditions. So, it is very important to understand the factors that affect the machinability and to evaluate their effects. Machinability of Epoxy/CF and CNT-Epoxy/CF was investigated. It was aimed to evaluate the machinability of these materials. A new machinability index has been developed in current study. It was found out that machinability of Epoxy/CF is better than CNT-Epoxy/CF.
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    Structural performance evaluation on aluminum plates retrofitted with composite: Impact of hybrid (bonded/bolted) joining methods under the flexural loading
    (Selçuk Üniversitesi, 2022) Ulus, Hasan; Kaybal, Halil Burak
    Engineering materials lose their mechanical performance due to environmental loadings during service, and they require reinforcement. Recently, externally jointed metallic members have been regarded as an effective technique for strengthening structures thanks to the composites being light and having good mechanical properties. Although the traditional methods (bonded and/or mechanical joining) have been widely used for combining, hybrid joints have recently become popular to take advantage of the load transfer efficiency of both techniques. On the other hand, it is essential to know which component the stress should be applied as a design criterion and how the damage behavior has changed accordingly. Since the member below the neutral axis is subjected to tensile and the upper is subjected to compressive stresses during bending loading, it is essential to understand how structural behavior is affected by the reinforcement in both cases. This work investigated the flexural behavior of bolted/bonded hybrid jointed aluminum-basalt composite, in the case of composite is below the neutral axis and aluminum below the neutral axis. Different damage modes were observed depending on different loading conditions and used joining techniques. Experiments indicate that applying the hybrid joining technique enhanced load-carrying capacity significantly attributed to bolts' restriction of shear deformation. This paper extends the understanding of aluminum retrofitting with composites and provides considerable suggestions for the joining method.