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Öğe A review of light duty passenger car weight reduction impact on CO2 emission(Inderscience Publishers, 2018) Kacar I.; Durgun I.; Ozturk F.; Simmons R.J.Over the last few decades, we have witnessed a significant increase in average temperatures all over the globe. Global warming has been now recognised as one of the major problems facing our world. In addition to natural processes, urbanisation, industrialisation, fossil fuel consumption, deforestation and other human activities have also contributed to excessive levels of greenhouse gases in the atmosphere, resulting in drastic climate change. This study investigates the relation between vehicle weight and CO2 emission for light-duty passenger cars. This study also analyses the fuel consumption in different cases. The evaluation of emissions is based on the CO2 composition of the total emission. Results show the relationship among weight, fuel consumption and CO2 emission. Under these circumstances, the most important way of reducing fuel consumption is to make the mass of the vehicle as small as possible when vehicle speed is constant. Various industry-wide technology adoptions on manufacturing methodologies to make vehicles' bodywork lighter are reviewed. Copyright © 2018 Inderscience Enterprises Ltd.Öğe Effects of variations in alloy content and machining parameters on the strength of the intermetallic bonding between a diesel piston and a ring carrier [Vpliv sprememb v sestavi zlitine in parametrov obdelave na trdnost intermetalne vezave med dieselskim batom in nosilcem obrocka](2010) Acar A.F.; Ozturk F.; Bayrak M.The intermetallic bonding between an aluminium alloy piston and a cast-iron ring carrier must be able to withstand prolonged exposure to the high-pressure and high-temperature environment of a diesel engine. Weak cohesion may result in the debonding of the ring carrier. Such debonding causes devastating damage to the piston while the engine is in service. Thus, the quality and strength of the intermetallic bonding is very important in piston manufacturing. In the present study, the effects of variations in the alloy content and the machining parameters on the overall strength of the intermetallic bonding are investigated. The defects are determined by ultrasonic inspection. The results indicate that the variation in the alloy content and graphite flakes affects the bond quality adversely. It was determined that the graphite size is a very important parameter. If the graphite size gets smaller, then stronger intermetallic bonding is observed. The graphite accumulation can be resolved by choosing the right amount of alloying elements. The machining process parameters were found to be ineffective for the formation of defects on the intermetallic bonding.Öğe Evaluation of anisotropy by two different tests for TRIP800 steel(Trans Tech Publications Ltd, 2014) Ozturk F.; Toros S.; Kilic S.; Kacar I.For the process modeling, material properties such as anisotropy values at different orientation are very important. The most commonly used method for the determining of the anisotropy values is the tensile test that is performed for samples are prepared at different orientation. Besides the tensile test, the anisotropy parameters of TRIP 800 steel are measured with the hole-expansion test. The effects of the test methods on the yield surfaces are determined for using two different anisotropic yield criteria are Hill-48 and Barlat-89. Results illustrated that a significant difference is observed in the yield surfaces for the two test methods. The material under biaxial deformation is deformed plastically faster than the uniaxial deformation mode. © (2014) Trans Tech Publications, Switzerland.Öğe Springback evaluation of 5052-H32 aluminum-magnesium alloy(Hanrimwon Publishing Co., 2008) Alkan M.; Ozturk F.; Toros S.; Kilic S.Springback is one of the most common problems in sheet metal forming operation. It causes improper fit which creates serious problems during assembly of the parts. Based on material strength, a considerable elastic recovery during unloading can be observed. In the present study, the springback evaluation of 5052-H32 aluminum magnesium alloy sheets with a thickness of 1.5 mm was investigated using 60o angle V-shape die at several temperatures range of room to 300°C and strain rate range of 25-625 mm/min. Although the springback of the material was increased with increasing the temperature up to 200°C, it was decreased for all deformation speeds at 300°C. Bending force of the material was not changed with deformation speeds except for 300°C. The bending force was obtained at 625 mm/min is higher than the other deformation speeds. The best bending condition of this material was obtained at 300°C and 25 mm/min.
