|
|
Fatigue behavior of high strength steels (S460, S690 and S960) after corrosion
Benešová, Anna ; Květoň, Josef (referee) ; Seitl, Stanislav (advisor)
The subject of this diploma thesis is the issue of the interaction of fatigue stress and corrosion on high-strength steel. Specifically, S 460, S 690, S 960 were selected. This work presents the results of fatigue experiments on test samples that were degraded by four types of corrosion, mainly in artificial atmospheres. Subsequently, fatigue models were calculated from these data, which describe the fatigue behavior of these steels and were compared with each other. At the end, photographs of fracture surfaces of broken samples of these steels were taken, which were analyzed and their fatigue behavior was discussed with their help together with the created fatigue models.
|
|
| |
|
|
Analysis of the use of Code_Aster in solving the limit state of fatigue strength
Busta, Michal ; Kovář, Jaroslav (referee) ; Vosynek, Petr (advisor)
This bachelor’s thesis deals with the analysis of the use of Code_Aster in the calculations of the limit state of fatigue strength. The first part is the research in fatigue analysis using the solver Code_Aster and in the second part the know-how of Code_Aster usage is used to solve three tasks of the limit state of fatigue strength. Acquired results are compared with analytical solutions and with the student licence of the numerical software Ansys Workbench 19.2. In conclusion, all the results are analysed.
|
|
| |
|
| |
|
|
Safe-life extension program for ZLIN Z 126 and 226 airplanes
Jančář, Milan ; Juračka, Jaroslav (referee) ; Augustin, Petr (advisor)
This master's thesis discusses the possibilities of safe-life extension program for ZLIN Z 126 and 226 airplanes, which despite their age and long-end production are still widespread and popular not only in the Czech Republic. The age of these aircraft is also related to the fact, that some aircraft are already approaching its border life, so there is an interest for the longest possible technical and legislative airworthiness. As mentioned in my bachelor's thesis, during the existence of this model series, there was no major damage occurred, except for sporadic exfoliation corrosion of wing flanges. Experience with maintenance of this aircraft points to certain underestimation of the current 5500hrs lifetime and it is obvious to suggest possible steps to increase the current limit. The thesis is therefore considered in this context the possibility of producing new wing flanges made of another material, performed the calculation for wing fatigue exchanged with flanges and designed technological process of this exchange, so that ZLIN Z 126 and 226 airplanes can be safely operated in the future.
|
|
|
The role of material sciences in solving the problems technical accidents
Tonkovič, Miroslav ; Řičánková, Veronika (referee) ; Klakurková, Lenka (advisor)
Material sciences plays an irreplaceable role in explanation of various technical accidents. The proposed work focuses on examples of sever chosen technical accidents in which the knowledge of materials science was crucial in use and help to solve them. Description of an incident is stated to particular cases as well as results of these investigations, taking in mind the given topis of proposed work. The accidents are always described with necessary theoretical basis connected to each particular issue. Its knowledge was undoubtedly essential in solving the accident. The end of the work is a summary of the most frequent causes of technical accidents.
|
|
|
Analysis of crab frame of bridge magnet crane 15t 27,5m
Strommer, Bohumír ; Kolář, Pavel (referee) ; Pokorný, Přemysl (advisor)
The diploma thesis deals with crab frame of bridge magnet crane with lifting capacity 15t used in steel mill for handling billets. Thesis contains strength analysis and fatigue strength check of crab frame based on ČSN EN 13001. Strength analyses are made by using beam and shell models of finite element method. The diploma thesis was carried out in cooperation with Královopolská a.s. company.
|
|
|
Bituminous mixture desing with the use of 30 % reclaimed asphalt and its functional evaluation
Horáček, Daniel ; Šperka, Pavel (referee) ; Kudrna, Jan (advisor)
The aim of my bachelor thesis is to design asphalt mixture with a higher lifetime (mixture of type VMT 16) and its subsequent assessment by selected functional tests. VMT blends are used for load and underlayer layers of roads with higher transport loads. The main idea of this bachelor thesis is the design of an asphalt mixture consisting of natural aggregates, recycled asphalt mixtures and crumb rubber modified bitumen, yet retaining good road-holding properties. The use of recyclable bituminous mixtures will allow the recycling of bent or milled asphalt layers, which is currently high in surplus, and will allow the overall cost of building new high-quality asphalt layers to be reduced. The bachelor thesis describes the empirical and functional tests performed, according to which the resulting asphalt mixture was designed, and the results compared with the TP151 Asphalt mixture with high modulus of stiffness (VMT).
|
|
|
Human factor in the aircraft operations
Dostál, Tomáš ; Raudenský, Miroslav (referee) ; Daněk, Vladimír (advisor)
This bachelor´s thesis examines air accidents which is caused by human error. From selected air accidents are pointed out mistakes, which is caused by flight crew, their continuation, increase, main causation and formation air accident. Study of human mistakes and influence phase of flight are shown in diagrams. The conclusion of the bachelor thesis includes possible solving to elimination human error and increasing air traffic safety.
|
guest ::
