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Öğe The effect of raw corn oil and diesel fuel mixture on engine performances and emissions(SILA SCIENCE, 2011) Kus, RecaiThe energy requirement in the world is provided from fossil energy resources. However, the decrease in fossil energy resources and their negative impacts on the environment has increased the attention towards alternative energy resources. One of the alternative energy resources is vegetable oils. In this study, the effect of 50% raw corn oil and 50% diesel fuel (CO50) mixtures on the engine performances and emissions is investigated on a single-cylinder direct injection engine. With the use of CO50 fuel, we observed 4.153% decrease in engine power and 10.53% increase in specific fuel consumption on average compared to diesel fuel. In NOx and CO emissions, relatively, the decrease rate is 23% and 35.2%.Öğe The effect of the brake pad components to the some physical properties of the ecological brake pad samples(IOP PUBLISHING LTD, 2017) Unaldi, Mahmut; Kus, RecaiIn this study, brake pad components in powder form such as miscanthus, cashew, alumina, phenolic resin and calcite, were used to manufacture ecological brake pads. In the brake pad applications trial and error method is often used to find the optimum proportion providing the best characteristics of the component in composite. The evaluation process became complicated and time consuming due to the number of components used for the manufacture of brake pad, randomly selected mixing ratios, many samples produced with trial and error method and a vast variety of results obtained from the measurements. Taguchi method was utilized in order to determine how the compositions of the brake pad components in the range of 5-20 wt. % had an effect on the properties of the brake pads. As a result of the experiments such as density, hardness, porosity and wear rate, the characteristics of the brake pad samples were more affected by the proportions of Miscanthus and phenolic resin in the mixture.Öğe Impact of brass contents on thermal, friction and wear properties of brake linings composites(EDP SCIENCES S A, 2018) Sellami, Amira; Kchaou, Mohamed; Kus, Recai; Fajoui, Jamal; Elleuch, Riadh; Jaquemin, FredericAutomotive brake lining materials are composite materials of very complex formulation, highly heterogeneous. They help to carry out the desired combination of braking performance properties. Obviously, it requires that the friction material exhibits a good complementarities and adequate combination of physico-chemical, thermal properties that act synergistically to provide the braking performance which should be adjusted by the addition of metallic fillers. The aim of this work is to study the role of one of the copper alloy particles, namely brass, on friction and wear. For this purpose, the experimental approach is based on the development of a simplified formulation. Three derived composites were developed in the laboratory by the addition 1.5 wt.%, 3 wt.% and 4.5 wt.% of brass. It is shown that addition of copper alloy particles increased thermal properties. Wear test results show that brass contributes to friction and wear mechanisms from a quantity introduced in the formulation equal to 4.5 wt.%. In fact, given its large size, it acts as primary plates serving as supports for the formation and expansion of plates necessary to enhance the stability of friction coefficient. Conversely, when adding an amount less than 4.5%, brass particles are generally all removed from the matrix implying a higher source flow of third-body wear.Öğe Impact toughness and microstructure of continuous steel wire-reinforced cast iron composite(ELSEVIER SCIENCE SA, 2009) Akdemir, Ahmet; Kus, Recai; Simsir, MehmetIn this study, improvement of impact toughness of gray cast iron by reinforcing steel fiber was investigated. The composite material was produced by sand mould casting technique. Then, normalizing heat treatment was applied to the specimens at various temperatures (800 degrees C, 850 degrees C, and 900 degrees C). Charpy impact toughness tests were conducted at the temperature of -80 degrees C, 0 degrees C, and 27 degrees C. The results show that impact toughness of the gray cast iron is increased by reinforcing low carbon steel wire. As the test temperature is decreased, impact toughness of the composite specimens decreases considerably. It is noted that graphite free transition regions with high hardness were observed due to the carbon diffusion from cast iron to steel fiber. It is considered that interphase (fine pearlitic phase without graphite flakes) and bond quality in transition region contribute to increase in impact toughness of the cast iron composites. (C) 2009 Elsevier B.V. All rights reserved.Öğe Investigation of the tensile properties of continuous steel wire-reinforced gray cast iron composite(ELSEVIER SCIENCE SA, 2011) Akdemir, Ahmet; Kus, Recai; Simsir, MehmetThe aim of the present study was to improve the tensile properties of gray cast iron by reinforcing the material with a steel wire. The composite was produced by sand mold casting, and the specimens were normalized by applying heat treatments at 800 degrees C, 850 degrees C, and 900 degrees C. Tension tests were conducted on gray cast iron and composite specimens, and the microstructure of the specimens was examined with an optical microscope. The fracture surface of the tension test specimens was examined with a scanning electron microscope (SEM), and graphite-free transition regions with high degrees of hardness were observed due to the diffusion of carbon from the cast iron to the steel wire. The microstructure of the transition region (fine pearlitic phase with partially dissolved graphite flakes) and the bond quality in the transition region increased the tensile properties of cast iron composites. Also, it is concluded that the tensile properties of gray cast iron increased with an increase in the normalization temperature. (C) 2011 Elsevier B.V. All rights reserved.Öğe Neural Network Modelling of Breaking Force in Variable Road and Slope Conditions(WORLD ACAD UNION-WORLD ACAD PRESS, 2011) Kus, Recai; Taskiran, Ugur; Bayrakceken, HuseyinMost of the traffic accidents occur when the vehicle could not stop at desired point and time. The most important factors affecting the breaking performance are wheel and road conditions and parts which make up breaking system. Breaking test can be performed as road tests or can be carried out on breaking test equipment. Because road tests require special test areas and long time to complete, experiments performed with test equipment are preferred. The duration of tests and studies can be shortened by modeling experimental results with artificial neural networks (ANN). In this study, breaking outcomes are examined in different roads like linear and side slope roads, in different slipping conditions of the road; differences between the breaking performances are determined and mathematical model based on ANN is developed.Öğe Wear mechanisms of different engineering systems under higher solicitations: Overview and case studies(PERGAMON-ELSEVIER SCIENCE LTD, 2018) Sellami, Amira; Hentati, Nesrine; Kchaou, Mohamed; Kus, Recai; Elleuch, Riadh; Chowdhury, Mohammad AsaduzzamanToday's, vehicle systems and components require more interaction and innovation in mechanical systems. Furthermore, mechanical components should ensure by its properties the required functionalities. Potentially, under service, those systems are able to cause severe accidents. The particular attention is according to the improving requirements engineering in the choice of the material especially for automotive components submitted to higher stress level (induced by mechanical, thermal, tribological solicitations). Wear phenomena play a huge role in the effectiveness and durability of the vehicle system. The understand of wear as a failure mechanism induced by coupling and transient phenomena are fundamental in an innovative and creative process to improve automotive performance. Three cases of wear reported by the automotive industries are discussed in the text above: case 1: axle shaft of a motor vehicle, case 2: synchronizer rings, case 3: brake lining material.