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Öğe Application of Taguchi method on optimization of testing parameters for erosion of glass fiber reinforced epoxy composite materials(ELSEVIER SCI LTD, 2013) Bagci, Mehmet; Imrek, HuseyinThe target of this experimental study is to investigate solid particle erosion behavior of a new composite material formed by adding boric acid particles to glass fibers and epoxy resin at an amount of 15% and 30%. The tests which involved angular aluminum particles with two different sizes were conducted at different conditions of impact velocities, fiber directions and impingement angles. The test specimens were characterized by techniques of X-ray diffraction (XRD) and scanning electron microscope (SEM). In addition, the design of the experiments which utilizes Taguchi's orthogonal arrays approach was used and an optimal parameter combination determined which led to minimization of erosion rate of the composites. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.Öğe Energy generation from weights of moving vehicles: A case study at Alaeddin Keykubad Campus-Konya/Turkey(PERGAMON-ELSEVIER SCIENCE LTD, 2015) Khalfan, Omari Mashi; Imrek, HuseyinIn this study, an experimental analysis has been conducted to investigate whether the weights of vehicles moving along the roads could be utilised to generate energy or perform any useful mechanical work. The target is to harness the normally wasted energy from the vehicle weights through a hydraulic system placed underneath road bumps over which vehicles pass. To achieve the intended goal, an experimental set up composed of mainly mechanical and fluid power components was designed, manufactured and operated to simulate movements of the vehicles along the road. Parameters such as vehicle weights and speeds were used to find out how the loading and speed conditions of a vehicle can affect the energy generated by the system. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Erosion wear performance of borax filled novel hybrid composites by using the Taguchi experimental design(EMERALD GROUP PUBLISHING LTD, 2016) Bagci, Mehmet; Imrek, HuseyinPurpose - This study aims to examine solid particle erosion behavior of novel hybrid composite materials where borax (B2O3) particles (similar to 150 mu m) were added to glass fabric and epoxy resin at an amount of 15 and 30 per cent. Design/methodology/approach - The tests that involved slightly rounded and irregular Al2O3 particles having two erodent sizes (200, 400 mu m) were conducted at these operational conditions; namely, three impact velocities (23, 34, 53 m/s), two fabric directions (0/90/0, 45/-45/45) and three impingement angles (30 degrees, 60 degrees, 90 degrees). In addition, the design of experiments, which utilizes Taguchi's robust orthogonal arrays approach, was used and an optimum parameter combination was established, which had a minimum erosion rate. Moreover, scanning electron microscope and X-ray diffraction views show the visual effect of filler material. Findings - All test specimens regardless of their dissimilar characteristics displayed maximum erosion rate at 30 degrees impingement angle. Test specimens with 45/-45/45 fabric direction are more wear-resistant than their counterparts with 0/90/0 fabric direction. The erosion wear of glass fabric reinforced epoxy (GF/EP) composites whose matrix had 15 per cent addition of borax particles was higher than that of neat GF/EP composites. In addition, new composite material formed by including borax particles at a rate of 30 per cent of resin leads to a reduction in erosion rates. Originality/value - While fabric-reinforced polymers take place in most of the studies conducted on erosive wear of composites, studies involving erosion on composites with filler materials can hardly be encountered.Öğe Erosive Wear of Glass Fiber and B2O3 Reinforced Epoxy Composites(TRANS TECH PUBLICATIONS LTD, 2011) Bagci, Mehmet; Imrek, HuseyinIn this experimental study, erosive wear behavior of epoxy-resin dipped composite materials reinforced with glass fiber and B2O3 (borax) under different impact velocities, erodent sizes, and erodent striking angles along the fiber direction were investigated. The tests which involved slightly rounded and irregular silicon oxide (SiO2) particles having two different sizes of approximately 250 mu m and 500 mu m, were conducted at two different impact velocities of approximately 20 m/s and 40 m/s, two different fiber directions (0 degrees and 45 degrees) and six different impingement angles of 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees and 90 degrees. In the test results, erosion rates were obtained as functions of impact velocities, striking angles, fiber direction and particle sizes. In addition, the microscopic views showing worn out surfaces of the glass fiber reinforced epoxy composites were scrutinized.Öğe Investigation of influence of load and velocity on scoring of addendum modified gear tooth profiles(PERGAMON-ELSEVIER SCIENCE LTD, 2009) Imrek, Huseyin; Unuvar, AliIn general gears are used for power transmission in machines. Scoring is one of the factors that causes gears unusable. Since there are too many factors affecting scoring which have not satisfactorily been explained, researches on this subject are continuing. With the exception of addendum modi. cation, many factors affecting scoring phenomena have been analyzed in detail. Experimental works was performed in a FZG gear test apparatus for this purpose. In the experiments, scoring was investigated by using different speed and load levels with gear pairs having different addendum modi. cations. Amount of wearing and physical situation of pro. le surface were determined and evaluated for each speed and load level. The effect of addendum modi. cation and speed of revolution on scoring, were given in the conclusion according to the test results. (C) 2008 Elsevier Ltd. All rights reserved.Öğe Optimization of Test Parameters That Influence Erosive Wear Behaviors of Glass Fiber-Reinforced Epoxy Composites by Using the Taguchi Method(ASME, 2015) Bagci, Mehmet; Imrek, Huseyin; Khalfan, Omari MashiThis study describes the development of a multicomponent composite system consisting of thermoplastic epoxy resin reinforced with E-glass fiber and silicon dioxide (SiO2) particles and investigates its erosion behavior under different operating conditions. Due to the increasing importance of composites in engineering applications and the need to tackle solid particle erosion in various industrial sectors, the study aims at finding how these composites behave in such type of wear. The composite specimens used for the tests were classified into three types; pure glass fiber (GF)-epoxy, those with addition of SiO2 particles at an amount of 15% and the last group had SiO2 particles added at 30% of the resin used for the materials. The experiments were carried out by selecting three different impact velocities, three different impingement angles, and angular alumina abrasive particles having approximate sizes of 200 mu m. The fiber directions used were 0/90/0 and 45/-45/45. SEM views belonging to the specimens were taken before and after the tests in order to investigate the differences and the causes of the surface damages. Moreover, it is found that the Taguchi's robust orthogonal array method provides a simple, systematic, and efficient methodology for the optimization of the erosion wear parameters. At the end of the tests, the most significant factor in affecting the erosion rate is found to be the impingement angle, followed by the impact velocity, fiber direction, and filler material.Öğe Relation between wear and tooth width modification in spur gears(ELSEVIER SCIENCE SA, 2007) Imrek, Huseyin; Duzcukoglu, HayrettinIn this experimental study, width modification of a spur gear was investigated to fix instantaneous pressure changes along single meshing area on the gear profile. In this gear, variable pressure distribution caused by the single and double teeth meshing and the radius of curvature along the active gear profile was approximately kept constant by maintaining a constant ratio of applied load to the tooth width (F/b) on every point. Hence, Hertz pressure distribution along the gear profile was approximately equally achieved. Other factors affecting wear were kept constant during the experiment. The specimen used was made from AISI 4140 steel. Finally, the amount of wear in the teeth profiles between the modified and unmodified gears was compared. And wear depth of modified gear along the meshing area was almost uniform. (c) 2006 Elsevier B.V. All rights reserved.Öğe Solid Particle Erosion as Influenced by Tensile Axial Loads(TAYLOR & FRANCIS INC, 2011) Imrek, Huseyin; Bagci, Mehmet; Khalfan, Omari MashiIn this study, the effects of external loads and impingement angle on erosive wear of AISI 1010 steels were investigated. Tensile axial loads corresponding to 0, 20, 40, and 60% of the specimen material's yield strength were applied on specimens attached to a specially designed specimen holder. The erosion tests were conducted at impact angles of 15, 30, 45, 60, 75, and 90. for each loading. Particles with angular geometry were used as abrasive steel grits and their impact velocities were adjusted by changing air pressure. The impact velocity of the particles was set at 30 m/s. Graphs of erosion rates as a function of stress and impact angles were constructed based on specimens' weight loss obtained at the end of the tests. It was found that there was a slightly increase in erosion rate as a result of increased tensile stress. It was also found that the erosion rate increased between 0 and 30 degrees, whereas between 30 and 90 degrees impingement angles, the erosion rate was seen to fall.Öğe Solid particle erosion behaviour of glass fibre reinforced boric acid filled epoxy resin composites(ELSEVIER SCI LTD, 2011) Bagci, Mehmet; Imrek, HuseyinThe tests which involved angular aluminium (Al(2)O(3)) particles with two different sizes of approximately 200 and 400 mu m were conducted at the operating conditions namely different impact velocities of approximately 23, 34 and 53 m/s, two different fibre directions [0 degrees (0/90) and 45 degrees (45/-45)] and three different impingement angles of 30 degrees, 60 degrees and 90 degrees. New composites with addition of Boric Acid filler material at 15% of resin exhibited upper wear than the neat materials without filler material. This means the filler material has decreased the erosion wear resistance. SEM views showing worn out surfaces of the test specimens were scrutinised. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
