beril eker - Academia.edu (original) (raw)
Papers by beril eker
Marmara Üniversitesi, 2004
Televizyonlar, çamaşır makineleri, çimen biçme makineleri ve otomobillerden tren ve havayolları g... more Televizyonlar, çamaşır makineleri, çimen biçme makineleri ve otomobillerden tren ve havayolları gibi daha büyük teknik sistemlerin ve elemanlarının güvenirliğinin önemi günlük hayatın her kademesinde fark edilmiştir. Günümüzün rekabetçi dünyasında bütün mühendislik sistemlerinin belirlenen bir zaman içinde, öngörülen fonksiyonunu memnun edici bir şekilde yerine getirmesi beklenilmektedir. Hiç bir sistem, özellikle güvenirliğe göre tasarlanmadan, güvenli bir şekilde çalışamaz. Modern mühendislik sistemlerinin artan karmaşıklığından dolayı güvenirlik kavramı kapsamlı sistem tasarımında önem kazanmıştır. Güvenirlik önemlidir çünkü bir tasarımcı makine ve teçhizatı hem teoride hemde pratikte çalışacak şekilde tasarlamalıdır.Güvenirlik herhangi bir teknik sistemin, belirlenen bir zaman içinde,belirli şartlar altında, öngörülen fonksiyonunu yerine getirme ihtimalidir.Güvenilirlik istatistik ve mühendislik yaklaşımlarını içeren analitik bir problemdir. Pek çok ürün tasarımda güvenirliğe göre tasarlanmamaktadır.Bu genellikle pek çok ürün hatalarına neden olmaktadır. Belirli bir zaman diliminde üründe meydana gelebilecek arızaları kapsayan garanti belgesinin üretici tarafından verilmesine rağmen garanti süresince meydana gelebilecek pek çok arıza müşteride rahatsızlığa ve üreticinin de pahalı onarımlar yüzünden zarar etmesine neden olmaktadır. Ayrıca, garanti zamanı süresince veya daha sonra meydana gelebilecek pek çok ürün arızası üreticinin gelecekteki iş hayatını kötü etkileyecek itibar kaybı demektir. Bu tezde tasarımda güvenirlilik için fonksiyonu yerine getirememe biçimleri,güvenirlilik değişkenleri, model, ölçüt ve metodları incelenecektir. Araştırma sonuçları sınıflandırılacak ve mühendislik ürün tasarımına uygunluk açısından değerlendirilecektir. Ürün tasarımı için literatürde sık raslanan örnekleri güvenirlik değişkenleri, modelleri, ölçütleri ve metodları karşılaştırmak için kullanılacaktır. Bu tezden beklenen, ürün tasarımı için güvenilirlik değişkenleri, ürün ve güvenirlik modelleri, performans ölçütleri ve metodlarının uygunluğuna karar verebilmek için rasyonel bir yöntem belirlemesidir. Mart, 2004 Beril EKER The importance of reliability of components and systems is recognized at every stage of daily life, ranging from consumer products such as TV sets, clothes, washers and dryers, lawn mowers, and automobiles, to larger systems such as trains and airlines. In todays's competitive world, all engineering systems are expected to perform satisfactorily over the duration of their expected life span. No system will perform reliabily unless it is designed specifically for reliability. Due to the increasing complexity of modern engineering systems, the concept of reliability has become a very importantfactor in the overall system design. Reliability is important because a designer must design machinery and equipment that will work both in theory and in practice. Reliability is the probability of a device performing its function over a specified period of time and under specified operating conditions. Reliability is an analytical problem that involves both statistical and engineering aspects. Most of the products are not designed according to reliability-based design. This generally causes too many product failures. Although the manufacturer gives a warrantyto cover the failures of the product during its early stages of life, too many failures during the warranty period causes inconvenience to the customer and high cost repair to the manufacturer. In addition, too many product failures, either during or after the warranty period, will mean a loss of reputation which might adversely affect the future business for the manufacturer. In this thesis failure modes, reliability variables, models, measures and methods are investigated for product design. Search results will be classified accordingly and evaluated in terms of suitability for engineering product design. Common examples from the open literature will be used to compare failure modes, reliability variables, models, measures and methods for product design. This thesis is expected to determine the suitability of reliability variables, both product and reliability models, performance measures and methods for product design. January, 2004 Beril EKE
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 3, 2010
Manufacturing companies need to improve their production technology with improved dimensional acc... more Manufacturing companies need to improve their production technology with improved dimensional accuracy at lower cost in order to manufacture sheet metal based products. Scrap shedding is an issue that should be examined at the cutting and sheet metal forming operations. In order to extend the life cycle of the cutting moulds, scrap shedding should be identified. When scrap shedding has not been taken into consideration, scraps have accumulated in the moulds reducing the production quality and causing deformation of the mould, increasing the production cost by obligating to perform extra transactions. This study becomes more focused upon the analysis of scrap shedding. In order to simulate the scrap shedding LS-Dyna and Pam Stamp software have been used. For examining of the scrap shedding an automotive part was chosen. In order to realize scrap shedding having any problems, new improvements have been suggested. Design of Experiments techniques which provide important advantages to engineering studies have been examined. By means of experimental design techniques the scrap shedding design process was also added to the classical mold design approach via a less quantities of simulations.© 2010 ASME
No mechanical product will perform reliably unless it is designed specifically for reliability. T... more No mechanical product will perform reliably unless it is designed specifically for reliability. There are many studies about reliability in mechanical design but most of them focus on the one part of entire reliability problem. The ability to see the bigger picture is essential in the field of mechanical reliability. Reader can gain a holistic viewpoint for the consideration of mechanical reliability by this approach. In this study failure modes, reliability variables, models, measures and methods from mechanical engineering point of view were investigated. From the open literature, published research work was compiled. Search results were classified and evaluated in terms of suitability for mechanical engineering. As an example, the procedure to find the reliability of shaft was investigated in support of our approach. Analysis and documentation of failed mechanical components are essential for preventing designers from repeating the same errors. Therefore, this research is expecte...
Materials Testing, 2017
Hollow glass spheres (HGS) have many application areas in the field of composite production due t... more Hollow glass spheres (HGS) have many application areas in the field of composite production due to their lightweight property together with having a sufficient strength. This study has the focus on adding the HGS to epoxy resin in different concentrations. The surface of the glass spheres were modified with silane prior to resin casting. The material characterization of the HGS filled epoxies was based on the silane presence and the HGS addition. Dynamic mechanical analysis was applied to observe the mechanical properties depending on the temperature of the composites. Morphological investigations were made to determine the interfacial adhesion between epoxy and the HGS. As a result of these, it was obtained that the HGS addition enhanced the stiffness of the material without a sharp reduction in the ductility. Silane was observed to be successful in improving the storage modulus below the glass transition temperature (Tg). However, the reduction in Tg was observed in high amount of...
Mechanics, 2014
In this study, MQL turning performance was compared to dry conditions. The magnesium based materi... more In this study, MQL turning performance was compared to dry conditions. The magnesium based material will be formed by applying the orthogonal cutting. The CNC Lathe shall be used for both cutting processes. The experiment used MINITAB 16 software to establish the experiment plan. In this study, workpiece was turned at cutting speeds of 230, 330 and 430 m/min, feed rates of 0.20, 0.35 and 0.50 mm/rev and cutting depth of 1, 2 and 3 mm. Taguchi experimental design method was used for determining the settings of turning parameters. Orthogonal arrays of Taguchi, the signal-to-noise (S/N) ratio, the analysis of variance (ANOVA) were carried out to determine the optimum levels and to analyze the influence of cutting speed, feed rate, cutting depth on surface roughness, temperature and cutting forces during dry and MQL turning.
Marmara Üniversitesi, 2004
Televizyonlar, çamaşır makineleri, çimen biçme makineleri ve otomobillerden tren ve havayolları g... more Televizyonlar, çamaşır makineleri, çimen biçme makineleri ve otomobillerden tren ve havayolları gibi daha büyük teknik sistemlerin ve elemanlarının güvenirliğinin önemi günlük hayatın her kademesinde fark edilmiştir. Günümüzün rekabetçi dünyasında bütün mühendislik sistemlerinin belirlenen bir zaman içinde, öngörülen fonksiyonunu memnun edici bir şekilde yerine getirmesi beklenilmektedir. Hiç bir sistem, özellikle güvenirliğe göre tasarlanmadan, güvenli bir şekilde çalışamaz. Modern mühendislik sistemlerinin artan karmaşıklığından dolayı güvenirlik kavramı kapsamlı sistem tasarımında önem kazanmıştır. Güvenirlik önemlidir çünkü bir tasarımcı makine ve teçhizatı hem teoride hemde pratikte çalışacak şekilde tasarlamalıdır.Güvenirlik herhangi bir teknik sistemin, belirlenen bir zaman içinde,belirli şartlar altında, öngörülen fonksiyonunu yerine getirme ihtimalidir.Güvenilirlik istatistik ve mühendislik yaklaşımlarını içeren analitik bir problemdir. Pek çok ürün tasarımda güvenirliğe göre tasarlanmamaktadır.Bu genellikle pek çok ürün hatalarına neden olmaktadır. Belirli bir zaman diliminde üründe meydana gelebilecek arızaları kapsayan garanti belgesinin üretici tarafından verilmesine rağmen garanti süresince meydana gelebilecek pek çok arıza müşteride rahatsızlığa ve üreticinin de pahalı onarımlar yüzünden zarar etmesine neden olmaktadır. Ayrıca, garanti zamanı süresince veya daha sonra meydana gelebilecek pek çok ürün arızası üreticinin gelecekteki iş hayatını kötü etkileyecek itibar kaybı demektir. Bu tezde tasarımda güvenirlilik için fonksiyonu yerine getirememe biçimleri,güvenirlilik değişkenleri, model, ölçüt ve metodları incelenecektir. Araştırma sonuçları sınıflandırılacak ve mühendislik ürün tasarımına uygunluk açısından değerlendirilecektir. Ürün tasarımı için literatürde sık raslanan örnekleri güvenirlik değişkenleri, modelleri, ölçütleri ve metodları karşılaştırmak için kullanılacaktır. Bu tezden beklenen, ürün tasarımı için güvenilirlik değişkenleri, ürün ve güvenirlik modelleri, performans ölçütleri ve metodlarının uygunluğuna karar verebilmek için rasyonel bir yöntem belirlemesidir. Mart, 2004 Beril EKER The importance of reliability of components and systems is recognized at every stage of daily life, ranging from consumer products such as TV sets, clothes, washers and dryers, lawn mowers, and automobiles, to larger systems such as trains and airlines. In todays's competitive world, all engineering systems are expected to perform satisfactorily over the duration of their expected life span. No system will perform reliabily unless it is designed specifically for reliability. Due to the increasing complexity of modern engineering systems, the concept of reliability has become a very importantfactor in the overall system design. Reliability is important because a designer must design machinery and equipment that will work both in theory and in practice. Reliability is the probability of a device performing its function over a specified period of time and under specified operating conditions. Reliability is an analytical problem that involves both statistical and engineering aspects. Most of the products are not designed according to reliability-based design. This generally causes too many product failures. Although the manufacturer gives a warrantyto cover the failures of the product during its early stages of life, too many failures during the warranty period causes inconvenience to the customer and high cost repair to the manufacturer. In addition, too many product failures, either during or after the warranty period, will mean a loss of reputation which might adversely affect the future business for the manufacturer. In this thesis failure modes, reliability variables, models, measures and methods are investigated for product design. Search results will be classified accordingly and evaluated in terms of suitability for engineering product design. Common examples from the open literature will be used to compare failure modes, reliability variables, models, measures and methods for product design. This thesis is expected to determine the suitability of reliability variables, both product and reliability models, performance measures and methods for product design. January, 2004 Beril EKE
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 3, 2010
Manufacturing companies need to improve their production technology with improved dimensional acc... more Manufacturing companies need to improve their production technology with improved dimensional accuracy at lower cost in order to manufacture sheet metal based products. Scrap shedding is an issue that should be examined at the cutting and sheet metal forming operations. In order to extend the life cycle of the cutting moulds, scrap shedding should be identified. When scrap shedding has not been taken into consideration, scraps have accumulated in the moulds reducing the production quality and causing deformation of the mould, increasing the production cost by obligating to perform extra transactions. This study becomes more focused upon the analysis of scrap shedding. In order to simulate the scrap shedding LS-Dyna and Pam Stamp software have been used. For examining of the scrap shedding an automotive part was chosen. In order to realize scrap shedding having any problems, new improvements have been suggested. Design of Experiments techniques which provide important advantages to engineering studies have been examined. By means of experimental design techniques the scrap shedding design process was also added to the classical mold design approach via a less quantities of simulations.© 2010 ASME
No mechanical product will perform reliably unless it is designed specifically for reliability. T... more No mechanical product will perform reliably unless it is designed specifically for reliability. There are many studies about reliability in mechanical design but most of them focus on the one part of entire reliability problem. The ability to see the bigger picture is essential in the field of mechanical reliability. Reader can gain a holistic viewpoint for the consideration of mechanical reliability by this approach. In this study failure modes, reliability variables, models, measures and methods from mechanical engineering point of view were investigated. From the open literature, published research work was compiled. Search results were classified and evaluated in terms of suitability for mechanical engineering. As an example, the procedure to find the reliability of shaft was investigated in support of our approach. Analysis and documentation of failed mechanical components are essential for preventing designers from repeating the same errors. Therefore, this research is expecte...
Materials Testing, 2017
Hollow glass spheres (HGS) have many application areas in the field of composite production due t... more Hollow glass spheres (HGS) have many application areas in the field of composite production due to their lightweight property together with having a sufficient strength. This study has the focus on adding the HGS to epoxy resin in different concentrations. The surface of the glass spheres were modified with silane prior to resin casting. The material characterization of the HGS filled epoxies was based on the silane presence and the HGS addition. Dynamic mechanical analysis was applied to observe the mechanical properties depending on the temperature of the composites. Morphological investigations were made to determine the interfacial adhesion between epoxy and the HGS. As a result of these, it was obtained that the HGS addition enhanced the stiffness of the material without a sharp reduction in the ductility. Silane was observed to be successful in improving the storage modulus below the glass transition temperature (Tg). However, the reduction in Tg was observed in high amount of...
Mechanics, 2014
In this study, MQL turning performance was compared to dry conditions. The magnesium based materi... more In this study, MQL turning performance was compared to dry conditions. The magnesium based material will be formed by applying the orthogonal cutting. The CNC Lathe shall be used for both cutting processes. The experiment used MINITAB 16 software to establish the experiment plan. In this study, workpiece was turned at cutting speeds of 230, 330 and 430 m/min, feed rates of 0.20, 0.35 and 0.50 mm/rev and cutting depth of 1, 2 and 3 mm. Taguchi experimental design method was used for determining the settings of turning parameters. Orthogonal arrays of Taguchi, the signal-to-noise (S/N) ratio, the analysis of variance (ANOVA) were carried out to determine the optimum levels and to analyze the influence of cutting speed, feed rate, cutting depth on surface roughness, temperature and cutting forces during dry and MQL turning.