Yazar "Daghan, Behcet" seçeneğine göre listele

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    Effect of the size on the friction characteristics of brake friction materials: a case study with Al2O3
    (EMERALD GROUP PUBLISHING LTD, 2018) Sugoezue, Banu; Daghan, Behcet; Akdemir, Ahmet
    Purpose The purpose of this paper is to study the potential of alumina (Al2O3) in nanometer size in automotive brake friction materials. Design/methodology/approach Four brake linings containing alumina differing in particle size (355 mu m and 80 nm) and various amount (5 and 10 Wt.%) were designed and produced. The hardness, density and porosity of the samples were measured. All samples were tested on a full-scale brake dynamometer with gray cast iron disc to determine the tribological properties. Detailed examinations on the worn surface were analyzed using a scanning electron microscopy. Findings It was concluded that all performance parameters were beneficially affected because of nano alumina. Originality/value This paper emphasizes the importance of nano-composites in the automotive industry and helps industrial firms and academicians working on wear of materials.
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    Friction and wear properties of friction materials containing nano/micro-sized SiO2 particles
    (EMERALD GROUP PUBLISHING LTD, 2016) Sugozu, Kezban Banu; Daghan, Behcet; Akdemir, Ahmet; Ataberk, Necati
    Purpose - Among the components used for a car brake lining, the chemical and structural properties of the abrasives, jointly with the morphology and size of the particles influence the friction parameters and stability of the composite. This paper aims to investigate the effect of nano SiO2 particles in brake pads on friction and wear properties. Design/methodology/approach - In this paper, the effects of SiO2 (Silica) particles of varying size on the friction-wear properties of polymeric friction composites are investigated. Four friction composites were prepared containing (5, 10 Wt.%) micro silica (MS) particles and (5, 10 Wt.%) nano silica (NS) particles. The samples were produced by a conventional procedure for a dry formulation following dry-mixing, pre-forming and hot pressing. Friction and wear characteristics of the specimens against to a disk made of cast iron were studied. Friction coefficient, specific wear rate and hardness of specimens were obtained. Detailed examinations on the worn surface were analyzed using a scanning electron microscope. Findings - The results of test showed that the inclusion of nano silicon carbide (SiC) powder improved the wear performance significantly. Friction coefficient (mu) of NS samples was higher than the MS samples. Micro-SiC showed poor performance and mu. High wear performance was exhibited in materials containing 5 Wt.% NS and 10 Wt.% NS. Originality/value - This paper emphasizes the importance of nano-composites in the automotive industry and helps to industrial firms and academicians working on wear of materials.
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    Mixed-mode Fracture Toughness and Kink Formation of Woven Glass Reinforced Epoxy Composites
    (SAGE PUBLICATIONS LTD, 2009) Colak, Fatih M.; Daghan, Behcet; Sahin, Oemer Sinan
    In this study the fracture behavior of woven glass fiber reinforced epoxy composites with trough thickness crack oriented at different angles were investigated. The composite plates consisting of five layers have a thickness of 1.2 mm. The trough cracks were formed at the center of the specimens with lengths of 5 mm, 7 mm and 9 mm. The fracture behavior of the composites, subjected to tensile loading and kink formation, were investigated. The fracture toughness of the composite specimens was determined by using both initial notch depth and the compliance method. The experimental results were presented in graphical form.
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    A Study on DOE Methods for Hydromechanical Deep Drawing Process Parameters
    (TRANS TECH PUBLICATIONS LTD, 2012) Halkaci, Mehmet; Halkaci, H. Selcuk; Turkoz, Mevlut; Daghan, Behcet
    Formability of sheet metals can be increased by Hydromechanical Deep Drawing (HDD) process. Formability of the deep drawn cups is generally assessed by Limiting Drawing Ratio (LDR) which is the ratio of the blank diameter to punch diameter. In order to increase LDR by HDD, process parameters of the HDD should be arranged properly. Arranging of the process parameters requires a great knowledge about the effects of the process parameters to certain performance criteria of the process. Determining of the effects of the process parameters by full factorial experiments is a hard duty. Hence certain statistical methods that decrease the number and the cost of the experiments and reduce the time should be used to find effective parameters and their appropriate levels. In this study orthogonal experimental array was applied and effective process parameters were determined by analyzing predicted data with Taguchi's robust parameter design method and ANOVA method. Then the results were compared with each other to evaluate differences between the methods. By using the appropriate levels of the parameters the LDR of AA 5754 aluminum alloy which uses in automotive industry intensely was determined.