Browsing by Author "Can, Yücel"

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Gradually collapsible crash boxes with bonded aluminium tubes
(Ice Publishing, 2020-12-22) Can, Yücel; Güçlü, Harun; Kasar, İbrahim; Yazıcı, Murat; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; ABI-3125-2020; M-4741-2017; 57191191009; 57210637126; 7007162323
In this study, a novel crash box idea was presented, including a step-by-step collapsible structure by joining coaxial tubes with gradual bonding surface areas. This telescopic crash box absorbed impact energy by sequentially fracturing the adhesive interfaces from the top tube to the back tubes. In each bonding interface fracture, a certain amount of the impact energy was reduced. These gradually broken adhesive bonds and subsequent movement of the coaxial tubes were increased pedestrian safety by producing fewer impact forces and adding more braking time. Due to the just adhesive joints break after small hits, a broken crash box can be repaired easily by bonding coaxial tubes. Validation of the design was performed using the Finite Element Simulations by parametric modelling of the representative design of crash boxes with frontal impact simulations of a vehicle. Transmitted forces to the vehicle body were obtained according to impact duration. Impact energies were obtained by calculating the area under impact of forcedisplacement curves. The optimal size of the coaxial tube bonding interfaces and the number of the telescopic tubes were obtained for maximum energy absorption comparing with conventional crash boxes.
Impact loading performance of polymer foam core aluminium sandwich panels
(Polish Acad Sciences Inst Physics, 2019-04-01) Can, Yücel; Türkoğlu, I. K.; Güçlü, H.; GÜÇLÜ, HARUN; Kaşar, I.; Yazıcı, M.; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Anabilim Dalı.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; M-4741-2017
In this study, two different foam core aluminum face sheets sandwich panels were developed. The core materials were selected as expanded polypropylene (EPP) and extruded polystyrene (XPS) foams. Two aluminum face sheets and foam cores were combined with flexible epoxy-based adhesives, under 20 N static compression load. The average density of the produced sandwich panels was 0.39 g/cm(3) for EPP foam core sandwich and 0.33 g/cm(3) for XPS foam core sandwich panel. Produced specimens were subjected 3-point bending experiments under impact loading. Damage behavior of the sandwiches was observed using post-mortem pictures. The results show that the produced sandwiches damaged perfectly plastic deformations with face sheets and core. There was not any adhesive and cohesive failure in the core and face sheets interfaces.
Investigation of the crack propagation behavior of the multiwalled carbon nanotube/graphite/natural rubber hybrid nanocomposites using digital image correlation technique
(Amer Scientific Publishers, 2019-12-01) Can, Yücel; Kasım, Hasan; Aldeen, Ahmad Naser; Yazıcı, Murat; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi; 0000-0002-3024-5207; 0000-0002-8720-7594; AAS-6413-2021; AAE-6361-2021; M-4741-2017
In the presented study, a hybrid Natural Rubber (NR) based semiconductive nanocomposites was examined to obtain better electrical and mechanical properties. The hybrid nanocomposite produced by incorporation of the Multiwalled Carbon Nanotube (MWCNT) and graphite nanoparticles into the NR. The conventional curing additives also included in the compound. A functionalized MWCNT (1, 2 and 3 phr's) with 3 phr graphite quotas were studied to produce the NR nanocomposites. The MWCNT/Graphite and NR mixed homogeneously to advance the interfacial interaction with the matrix. The graphite nano-particulates added to obtain 3D electrical connectivity network in the hybrid nanocomposites by becoming bridging points between multiwalled carbon nanotubes. Nanocomposites were produced as 3 mm sheets in a steel mold by vulcanizing at 165 degrees C for 10 min under pressure. The single-edge notched tension specimens were subjected to estimate crack propagation and electrical resistance relation. Digital Image Correlation (DIC) technique was used to observe the crack resistivity function. The results evaluated to clarify the relationship between crack length, MWCNT filler ratio, and electrical conductivity properties. MWCNTs are generally preferred as the reinforcements for their very high aspect ratio and excellent specific surface area properties. However, the electrical conductivity of the nanocomposites is owing to the constitution of a continuous conductive 3D network of MWCNT and Graphite in the NR matrix.
Investigation of the crash boxes Light weighting with syntactic foams by the finite element analysis
(Polish Acad Sciences Inst Physics, 2017-09) Can, Yücel; Özer, Hakkı; Yazıcı, Murat; Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-8720-7594; M-4741-2017; AAI-6897-2021; 57196453033; 7007162323
Light-weighting is a new scope in the automotive industry to accommodate new emission regulations. The parts produced with conventional metallic materials are replaced with parts produced by using light weight or high strength materials, to obtain light weighted equivalents of the same strength. Foam core sandwich structures, high strength steels, composite materials are the most used alternative materials. Syntactic foams that show outstanding performance in case of high-speed collisions have an excellent utility as energy absorbers in vehicle crash boxes. Syntactic foams are modeled in crash boxes at various filling rates and filling patterns in the context of this study. As results of the FEM analyses, it is observed that syntactic foams have excellent crash performance, as well as weight-reducing effect in vehicle crash boxes.
Investigation of the hyperelastic material coated steel car hood concerning pedestrian head impact protection using finite element method
(Polish Academy of Sciences, 2018-07) Can, Yücel; Yazıcı, Murat; Güçlü, Harun; Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-8720-7594; 0000-0002-5679-313X; M-4741-2017; Q-8738-2018; ABI-3125-2020; 7007162323; 57191191009
Pedestrians are the high-risk group in vehicle accidents, especially in urban areas. In the world, every year numerous pedestrians die by vehicle impacts. Therefore, the pedestrian protection is one of the most crucial subjects in automotive manufacturers, and many governments are releasing more drastic regulations. However, in the traffic there is a considerable amount of the cars running which have been produced before pedestrian safety regulations. In this study, the pedestrian head impact on an energy absorber material covered steel bonnet was investigated by finite element method. The pedestrian head impact is the first reason for the fatality in the vehicle-pedestrian accidents. The pedestrian head-form is used for simulations according to EEVC/WG17 regulations. The foam cover and hood thicknesses are the parameters in the impact simulations. Results of the impact analyses are compared with each other by head injury criterion calculations. The head injury criterion values are accepted for measuring pedestrian's head injury level. In the study, various thickness hyperelastic foams were used in top layer as a cover. Moreover, also developed layered structure designs by steel, and hyperelastic material layers were discussed on light-weighting.
Pelet esaslı 3B kompozit yazıcı, karma elyaf tekniği ile parça üretimi ve performansının incelenmesi
(Bursa Uludağ Üniversitesi, 2023) Eminoğlu, Emir; Yazıcı, Murat; Can, Yücel; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Otomotiv Mühendisliği Anabilim Dalı.; 0009-0001-9775-4276
Bu çalışma, sürekli elyaf takviyeli termoplastik kompozitler ve 3B kompozit baskıteknolojisinin avantajlarından yararlanarak otomotiv parçalarının yeniden tasarlanmasıalanında gerçekleşmiştir. Bu çalışmanın ana odak noktası, kompozit fiber yöntemikullanarak parçaların üretimi ve performans özelliklerinin değerlendirilmesidir. Bu tezinamacı, bu yöntemle daha hafif, daha dayanıklı ve geri dönüştürülebilir kompozit parçalarelde etme potansiyelini vurgulamak ve böylece otomotiv sektöründe, özellikle elektrikliaraçlar için uygulamalarını ilerletmektir. Bu araştırmada, UMİMAG Laboratuvarı'ndaincelenen bir projenin sonucu olarak ortaya çıkan ekstrüderli bir 3B yazıcı kullanılmıştır,bu da bu malzeme teknolojisinin önemini vurgulamaktadır. 3B baskı teknolojisindekullanılan çeşitli malzemeler, polimerler, metaller, seramikler, kompozitler vebiyomalzemeler hakkında kapsamlı bir analiz sunulmakta, özellikle 3B kompozit vegranül malzemelerin baskısı üzerine odaklanmıştır. Ayrıca, 3B yazıcılarda kullanılanhammaddelerin çeşitliliğini, kaliteye olan etkileri ve genel çalışma prensipleri detaylı birşekilde araştırılmıştır. Ekstruderli 3B yazıcının kullanımı ve bakımı, granül malzemelerinve cam fiberlerin seçimi ve karşılaştırılması, cam fiberin 3B yazıcı filamenti halinegetirilme prosedürü, üç nokta eğilme testi için numune standartları ve basımı detaylıolarak ele alınmaktadır. Tez, cam fiber takviyeli kompozit numunelerin mukavemetinde%18,46'lik bir artış olduğunu kanıtlayarak sonuçlandı, bu da sürekli elyaf takviyelitermoplastik kompozitlerin otomotiv endüstrisindeki kullanım potansiyelini vurgular ve3B kompozit yazıcı teknolojisinin geliştirilmesi için daha fazla araştırma yapılmasınıteşvik etmektedir.
Polymer foam core aluminum sandwich lightweight car hood for pedestrian protection
(Polish Acad Sciences Inst Physics, 2018-07) Can, Yücel; Yazıcı, Murat; Güçlü, Harun; Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; M-4741-2017; ABI-3125-2020; 7007162323; 57191191009
In this study, various sandwich structures were designed for application in car hoods to reduce the pedestrian head injuries. In the sandwich panels, the face sheets were made of thin aluminum and steel plates, and the core materials were chosen to be of polymer foams. Polymer foams have high energy absorbing performance under impact loading. They can be unflammable and resistive to high-temperatures, depending on the base polymer. The main goal of the presented study is to develop a sandwich structure for car hood to reduce fatality in the pedestrian-car accidents by decreasing the value of head injury criterion. Sandwich panel face sheet, polymer foam core thickness, and two different face sheet material were studied as research parameters using the finite element analysis. The pedestrian headform was modeled according to EEVC/WG17 regulations and used in the finite element simulations. The lightest hood and the minimum head injury criterion value have been achieved using the thinner steel front face and the thicker foam core.