Sakarya University is located in Sakarya, Turkey. It was founded as Sakarya Engineering and Architecture in 1970. It renamed as Sakarya State Engineering and Architecture Academy in 1971. It opened Master of Science and Doctorate of Philosophy programs in 1980. The programs were executed by İTÜ Institute of Pure and Applied science. It was bounded to İstanbul Technical University in 1982 as Sakarya Engineering Faculty in 1982. Vocational Schools of Sakarya and Düzce were bounded to her at same year. Finally It left from ITÜ and became Engineering Faculty of Sakarya University in 1992. Düzce Vocational School left from Sakarya Engineering Faculty and bounded to Abant Izzet Baysal University at same year. Wikipedia.
Findik F.,Sakarya University
Materials and Design | Year: 2011
Explosion welding (EXW) is one of the joining methods consisting of a solid state welding process in which controlled explosive detonation on the surface of a metal. During the collision, a high velocity jet is produced to remove away the impurities on the metal surfaces. Flyer plate collides with base plate resulting in a bonding at the interface of metals. The metal plates are joined at an internal point under the influence of a very high pressure and causes considerable local plastic deformation at the interface in which metallurgical bonding occurs in nature and even stronger than the parent metals. Similar and dissimilar materials can be joined by explosive welding. In this paper, after detection the theories of welding and wave formation, experimental research and numerical studies on explosive welding are reviewed for the last four decades. Also, future developments in explosive welding are predicted and criticized in an outlook. © 2010 Elsevier Ltd.
Findik F.,Sakarya University
Materials and Design | Year: 2014
Wear is closely related to friction and lubrication; the study of these three subjects is known as tribology. In science and technology it is concerned with interacting surfaces in relative motion. Soft or hard film coating, alloying and composite structuring have all been developed to control wear and friction. This is achieved by improving materials and surfaces with some characteristics that improve resistance to friction and wear. In recent years, several new solid lubricant and modern lubrication concepts have been developed to achieve better lubricity and longer wear life in demanding tribological applications. Most of the traditional solid lubricants were prepared in the form of metal, ceramic and polymer-matrix composites. They have been used successfully in various engineering applications. Recent progress in thin-film deposition technologies has led to the synthesis of new generations of self-lubricating coatings with composite or multilayered architectures, by using multiplex surface treatments. In this study, typical wear behaviors of representative materials of metallic alloys, ceramics, polymeric materials, and composites are reviewed in relation to their friction behaviors. Additionally, modeling for the wear prediction is outlined. © 2013 Elsevier Ltd.
Yuksel I.,Sakarya University
Renewable Energy | Year: 2013
In the last decade, Turkish electricity demand has increased more than 8% per annum as a result of economic development. Being one of the renewable energy sources par excellence, non-exhaustible, non-polluting and economically more attractive than other renewable sources, hydropower has turned out to be an important contributor to the future energy mix of the country. Turkey's renewable energy sources especially hydropower sources are plentiful and extensive, and represent the second-largest domestic energy sources after coal. Turkey has a total gross hydropower potential of 433 TWh/year and 140 TWh/year of this capacity can be used economically. Currently, Turkey has 172 hydroelectric power plants in operation with total installed capacity of 13,700 MW generating an average of 48,000 GWh/year, which is 35% of the economically viable hydroelectric potential. 148 hydroelectric power plants are under construction 8,600 MW of installed capacity to generate average annual 20,000 GWh representing 14% of the economically viable potential. The share of renewables in total electricity generation is 17%, while that of thermal is 80% in 2009. The projection for the period 2010-2020 is for annual growth of 8% in total electricity generation. The additional generation capacity needed up to 2020 will require huge investments. This paper deals with present situation and future prospect of renewable energy and the role of hydropower in Turkey. © 2012 Elsevier Ltd.
Sumer M.,Sakarya University
Construction and Building Materials | Year: 2012
This paper presents the results of an experimental investigation carried out to evaluate compressive strength and sulfate resistance properties of concrete mixtures in which Turkish Class C and Class F fly ashes were partially replaced with cement. A total of 39 mixtures with different mix designs were prepared. Compressive strength tests were carried out and the mixtures with similar compressive strength values were used for sulfate resistance tests. The degree of sulfate attack was evaluated using expansion and weight loss tests. Compression test results indicate that the concrete mixture with Class C fly ash showed higher compressive strength than that with Class F fly ash. Moreover, regardless the fly ash type, the addition of fly ash significantly increased the resistance to sulfate attack. © 2012 Elsevier Ltd. All rights reserved.
Buyukkaya E.,Sakarya University
Fuel | Year: 2010
Experimenal tests were investigated to evaluate the performance, emission and combustion of a diesel engine using neat rapeseed oil and its blends of 5%, 20% and 70%, and standard diesel fuel separately. The results indicate that the use of biodiesel produces lower smoke opacity (up to 60%), and higher brake specific fuel consumption (BSFC) (up to 11%) compared to diesel fuel. The measured CO emissions of B5 and B100 fuels were found to be 9% and 32% lower than that of the diesel fuel, respectively. The BSFC of biodiesel at the maximum torque and rated power conditions were found to be 8.5% and 8% higher than that of the diesel fuel, respectively. From the combustion analysis, it was found that ignition delay was shorter for neat rapeseed oil and its blends tested compared to that of standard diesel. The combustion characteristics of rapeseed oil and its diesel blends closely followed those of standard diesel. © 2009 Elsevier Ltd. All rights reserved.