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Analysis of nozzle-to-shell joint connected to the process piping
Ondráček, Marek ; Michálková, Anežka (referee) ; Pernica, Marek (advisor)
The diploma thesis focuses on the stress analysis of the nozzle-shell junction of a pressure vessel loaded with forces and moments from the connected process piping. The diploma thesis provides general information about pressure vessels, nozzles, piping systems, and details the various methods used for the calculations. The computational part of the diploma thesis focus on the stress analysis at the nozzle-shell junction of the pressure vessel, where the analyzed nozzle is connected to the process piping. The piping generates forces and moments on the nozzle, which must be considered in the stress calculations for this junction. The software Caesar II is used to calculate the forces and moments from the piping. For the stress analysis of the junction, the thesis uses several calculation methods, including the Welding Research Council (WRC) guidelines, PD 5500 standard, CSN EN 13445 standard, and the Finite Element Method (FEM). The objective of the thesis is to evaluate the outcomes of each method, compare them, and assess their approaches to calculating the stress at the junction between the nozzle and the shell of the pressure vessel.
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Development of structural analysis software
Michálková, Anežka ; Buzík, Jiří (referee) ; Létal, Tomáš (advisor)
This bachelor thesis deals with a development of software for strength analysis of truss and beam elements using the Finite Element Method. Firstly, this thesis introduces basic theory of this method which is necessary for development of the software. Next part of the thesis discusses the software itself. Essential feature of development of the software was to transform mathematical theory to uncomplicated algorithms which are explained in the thesis. Last part is dedicated to comparison of the strength analysis results gained from the developed software and from ANSYS Workbench.
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Deformation and damage of tube bundle bends due to temperature
Michálková, Anežka ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master’s thesis deals with the problem of determining the thermal load of cross-flow tube bundle bends in steam superheater. Firstly, the theoretical basis of computational fluid dynamics and finite element method is introduced, and the possible methods of creep damage evaluation are presented as it was assumed that creep damage would be the most significant damage mechanism. The next part of this thesis describes simulations in ANSYS Fluent to determine values of heat transfer coefficients and ANSYS Mechanical to obtain temperature field and stresses. Based on the determined temperature field and stresses, a creep lifetime calculation according to ČSN EN 12952-4 is performed. Then creep design check for operating time 200 000 hours was carried out according to ČSN EN 13445-3. It was determined that in this case the tube bends are not the critical spot in comparison with the straight sections of tubes.
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Deformation and damage of tube bundle bends due to temperature
Michálková, Anežka ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master’s thesis deals with the problem of determining the thermal load of cross-flow tube bundle bends in steam superheater. Firstly, the theoretical basis of computational fluid dynamics and finite element method is introduced, and the possible methods of creep damage evaluation are presented as it was assumed that creep damage would be the most significant damage mechanism. The next part of this thesis describes simulations in ANSYS Fluent to determine values of heat transfer coefficients and ANSYS Mechanical to obtain temperature field and stresses. Based on the determined temperature field and stresses, a creep lifetime calculation according to ČSN EN 12952-4 is performed. Then creep design check for operating time 200 000 hours was carried out according to ČSN EN 13445-3. It was determined that in this case the tube bends are not the critical spot in comparison with the straight sections of tubes.
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Development of structural analysis software
Michálková, Anežka ; Buzík, Jiří (referee) ; Létal, Tomáš (advisor)
This bachelor thesis deals with a development of software for strength analysis of truss and beam elements using the Finite Element Method. Firstly, this thesis introduces basic theory of this method which is necessary for development of the software. Next part of the thesis discusses the software itself. Essential feature of development of the software was to transform mathematical theory to uncomplicated algorithms which are explained in the thesis. Last part is dedicated to comparison of the strength analysis results gained from the developed software and from ANSYS Workbench.
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