Ahmet Atak

Gazi University · TUSAŞ-Kazan Vocational School / Dep. of Motor Vehicles and Transportation Technology / Airplane Technology

In the realm of beings, human beings by their nature, are never satisfied with one kind of product and are always on the lookout for difference and innovation. When the world of animals is observed, for example, it can be seen that they are beings who never tire of eating grass or doing the same thing for life. Besides, they do not have multiple op...

Installation and repair of hydraulic installations are carried out by joining the pipes in the field. Pipe connections in aviation are made in a very narrow space and field. For this reason, fitting swaging method is used to connect the fittings to the pipes with a hydraulic hand tool. The basis for developing a swaging tool is knowledge of the des...

In the realm of beings, human beings by their nature, are never satisfied with one kind of product and are always on the lookout for difference and innovation. When the world of animals is observed, for example, it can be seen that they are beings who never tire of eating grass or doing the same thing for life. Besides, they do not have multiple...

Structural systems consist of subsystems and elements. Connection elements are needed for the subsystems and assembly and integration of these systems to the main system. Because the main system can fulfill its functional tasks when its assembly and integration with the subsystem is completed. Systematic static strength and dynamic behavior of stru...

In various fields of engineering, the assembly and repair of hydraulic installations are accomplished by joining the pipes. In such applications, the ring swaging method is used to connect the fittings to the pipes by means of a hydraulic hand tool. The basis to develop a swaging tool relies on the knowledge of the design parameter that influence p...

To reduce the fuel consumption and enhance the flight performance of satellites, it is desirable to employ structural components of low weight, high strength, and high stiffness. Therefore, most primary and secondary structures of satellites are built using sandwich panels. Fasteners, which constitute secondary structures, are normally used as join...

Central cylinders (CC) are the main carrier structural elements that carry all satellites, especially used in communication satellites. For higher capacity satellites in terms of more electrical power, more payload and longer service life, it requires creating more volume in the satellite and effective use of space. In traditional chemical propulsi...

Friction stir welding is commonly used to join metals because it is environmentally friendly and provides higher fatigue strength than electric resistance spot welding, riveted connections, and screw connections. Alternative methods that do not reduce the fatigue strength, such as friction stir spot welding (FSSW), are being investigated. However,...

To reduce the fuel consumption and enhance the flight performance of satellites, it is desirable to employ structural components of low weight, high strength, and high stiffness. Therefore, most primary and secondary structures of satellites are built using sandwich panels. Fasteners, which constitute secondary structures, are normally used as join...

Structural systems are composed of their subsystems and elements. Connection parts are required through subsystems and their assembly and integration to the main system. The reason of that main system can be functional when it’s assembly and integration is completed with subsystem. The load carrier material and static cross-sectional properties, as...

The strength, failure location and modes of AZ31B Magnesium sheets with 1.5 mm thickness, joined using friction stir spot welding (FSSW), can be determined using tension-shear tests. However, the joined materials have different tension test and elastic-plastic characteristics. Elastic analysis methods for spot welding have been examined in detail i...

Uydu yapılarında, yakıt tüketimini azaltıp uçuş performansını arttırmak için genellikle yüksek dayanım ve katılık değerlerine sahip hafif komponentler tercih edilmektedir. Bu yüzden, sandviç kompozit yapılar ağırlıklarına göre dayanıklı yapılar olduğu için uydu bileşenlerinde sıklıkla kullanılmaktadır. Sandviç yapıların birbirleriyle ve başka donan...

Showed and used methodology herein gives a new perspective for designers and researchers to distinguish the best design, by using Hierarchical Tree, Belief Map and Decision Matrix methods. In this study, The Decision Matrix, Hierarchical Tree Method, Belief Map and Eleven-Point Scaling are improved with quantitative evaluation methods to obtain a c...

Design affects the entire lifespan of a product. Humans design ideas in their environments, especially to meet their own needs. People come to design ideas and abilities from various objects and events in nature, and use these to increase their design capabilities. With the increase in human population, proliferation of product needs, and the dange...

This paper deals with weight optimization of the central cylinder (CC) made of Carbon-fiber reinforced polymer (CFRP) sandwich material using topologic optimization to be more advantageous over other types of the CC in terms of weight and cost. After finding optimal lay-up, orientations and number of laminate layers of CFRP sandwich cylindrical she...

This paper summarizes results of a technical investigation made after a satellite structural test. After acoustic tests done on a telecommunication satellite, different dynamic behaviors observed on two similar and symmetrically placed equipments. Three possible causes are considered for the observed effect one of them is local turbulence in air fl...

Eurocode 3 (EC3) was introduced in the European Community countries of June 2012. Previously the weld connection of steel structure was calculated with different methods (DIN 18800} in different countries. With TS EN 1993-1-1-December 2005-"design of steel structures," and TS EN 1993-l-8+AC - December 2005-"General Rules-design of joints named" has...

The use of light metals today is of great importance, for example in the automotive, aviation and aerospace industries, where energy consumption is minimized and thus the economy is being attempted. By using light metals, weight is reduced so that energy is saved. Aluminum and magnesium alloys are particularly used thanks to their lightweight. Vehi...

The Light metals such as aluminum and magnesium alloys find extensive use in land and air transport vehicles, electronics, computer and sporting goods industries. In order to reduce weight and thus save fuel, many studies are carried out on the development of new engineering materials, which have lightweight and high fatigue strength, especially fo...

The use of light metals today is of great importance, for example in the automotive, aviation and aerospace industries, where energy consumption is minimized and thus the economy is being attempted. By using light metals, weight is reduced so that energy is saved. Aluminum and magnesium alloys are particularly used thanks to their lightweight. Vehi...

Haberleşme uyduları üretimi sırasında, başlıca uydunun fırlatma sırasında olmak üzere, hizmet süresince maruz kalacağı sinüs, rastgele ve şok titreşimlerine karşı uygunluğunu test etmek için çevresel mekanik titreşim testlerine tabi tutulur. Bu testlerin planlanması, test için ivme ve gerinim ölçerlerin yerleştirilmesi, yatay ve düşey testlerin yap...

The Light metals such as aluminum and magnesium alloys find extensive use in land and air transport vehicles, electronics, computer and sporting goods industries. In order to reduce weight and thus save fuel, many studies are carried out on the development of new engineering materials, which have lightweight and high fatigue strength, especially fo...

In this paper, friction stir spot welding (FSSW) of magnesium sheets were analyzed using finite element method (FEM). Various tool shoulder types used in Friction stir welding (FSW) were chosen as different parameter. Thermic simulations were showed that thermic conditions vary with tool shoulder design types used in friction stir welding. Heat ene...

Machine parts fail to perform their tasks due to the fatigue with the rate of 90%. The fatigue applications have been known since the early days of the industrial revolution. The field of study on metal fatigue has started to expand due to the increase in the use of steel constructions in the systems of railway bridges in particular. It is of criti...

Light metals such as aluminum and magnesium alloys are used in land vehicles, electronics, computers, and sports device industry. Many studies have been carried out on the development of new, low weight engineering materials to reduce weight and fuel consumption, especially in the automotive and aerospace industries. One of the first metals that co...

The main reason to finish the mission of machine parts is based with 90 % of the fatigue. Fatigue can be caused by surface defects with smoothness, sharp comers, indentations, protrusions, etc. One other sort of effect of fatigue the defects in the microstructure like ruins, cracks, sharp and sediment particles. Eurocode 3 (EC3) method has been dev...