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Testing of high-temperature corrosion resistance of 16M03 steel
Šikl, František ; Kolomý, Štěpán (referee) ; Zemčík, Oskar (advisor)
The aim of this work is to design and perform an experiment that simulates the environment of a municipal waste incinerator. However, the whole process of corrosion in real life can take several years, so it is necessary to accelerate these processes in both higher areas and more aggressive environments. The investigated material is 16Mo3 steel. The first part of the work is a search of selected issues of corrosion and materials used in the energy industry. The next part of the work deals with the design of the experiment, which consists of several parts. These may include the appropriate choice of chemical compounds used or the choice of measured temperatures or sample preparation, the experiment being adapted to the available equipment of the BUT FSI workshop. In the last part of the work, testing of the specified material for temperatures of 900 °C, 975 °C and 1 050 °C is performed, while the composition of the mixture is designed as 35 wt. % Na2SO4, 30 wt. % KCl at 35 wt. % NaCl. The measured values are compared depending on the temperature, where, as predicted, a larger graphical dependence can be seen at higher values. At the end, the results of corrosion loss of 16Mo3 steel were compared with Inconel 625 superalloy, where the theory already differs from practice. Furthermore, chemical analyzes from the experiment were performed at 1 050 °C and, based on these obtained values, the proportion of individual elements can be adjusted with the salt mixture used. This adjustment is recommended to reduce the NaCl content due to the higher Na content, as well as to increase the KCl content due to the low K content.
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Solution of the exact differential equation of deflection curve
Šikl, František ; Fuis, Vladimír (referee) ; Vaverka, Jiří (advisor)
This bachelor thesis deals with the deformation of a beam loaded with a basic bend using the differential equation of the deflection curve. The work is divided into four parts, where in the first part the general form of the differential equation of the deflection curve, which is based on simple geometry and mathematical approximations, is derived. In the second part, we will describe the basic methods of solving the differential equation of the deflection curve for large deformations for simple cases, where we must use the nonlinear form of the already mentioned equation. However, we will also mention methods that can be used for specific cases. In the third part, two numerical methods, which can be used to solve large deformations of beams, are being programmed. The last part describes the difference between the linear equation of the deflection curve, which is simplified and taught commonly, and the nonlinear differential equation of the second order. The fundamental task of the work is a comparison of commonly used methods to determine the deformation of the beam and to determine the degree of load, when it is possible to use a simplified differential equation of the deflection curve, and when not. However, it is important to mention that the numerical solution cannot always be used, so the example will be embedded in a simple case.
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Testing of high-temperature corrosion resistance of 16M03 steel
Šikl, František ; Kolomý, Štěpán (referee) ; Zemčík, Oskar (advisor)
The aim of this work is to design and perform an experiment that simulates the environment of a municipal waste incinerator. However, the whole process of corrosion in real life can take several years, so it is necessary to accelerate these processes in both higher areas and more aggressive environments. The investigated material is 16Mo3 steel. The first part of the work is a search of selected issues of corrosion and materials used in the energy industry. The next part of the work deals with the design of the experiment, which consists of several parts. These may include the appropriate choice of chemical compounds used or the choice of measured temperatures or sample preparation, the experiment being adapted to the available equipment of the BUT FSI workshop. In the last part of the work, testing of the specified material for temperatures of 900 °C, 975 °C and 1 050 °C is performed, while the composition of the mixture is designed as 35 wt. % Na2SO4, 30 wt. % KCl at 35 wt. % NaCl. The measured values are compared depending on the temperature, where, as predicted, a larger graphical dependence can be seen at higher values. At the end, the results of corrosion loss of 16Mo3 steel were compared with Inconel 625 superalloy, where the theory already differs from practice. Furthermore, chemical analyzes from the experiment were performed at 1 050 °C and, based on these obtained values, the proportion of individual elements can be adjusted with the salt mixture used. This adjustment is recommended to reduce the NaCl content due to the higher Na content, as well as to increase the KCl content due to the low K content.
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Solution of the exact differential equation of deflection curve
Šikl, František ; Fuis, Vladimír (referee) ; Vaverka, Jiří (advisor)
This bachelor thesis deals with the deformation of a beam loaded with a basic bend using the differential equation of the deflection curve. The work is divided into four parts, where in the first part the general form of the differential equation of the deflection curve, which is based on simple geometry and mathematical approximations, is derived. In the second part, we will describe the basic methods of solving the differential equation of the deflection curve for large deformations for simple cases, where we must use the nonlinear form of the already mentioned equation. However, we will also mention methods that can be used for specific cases. In the third part, two numerical methods, which can be used to solve large deformations of beams, are being programmed. The last part describes the difference between the linear equation of the deflection curve, which is simplified and taught commonly, and the nonlinear differential equation of the second order. The fundamental task of the work is a comparison of commonly used methods to determine the deformation of the beam and to determine the degree of load, when it is possible to use a simplified differential equation of the deflection curve, and when not. However, it is important to mention that the numerical solution cannot always be used, so the example will be embedded in a simple case.
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