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Utilization of cold spray technology for ballistic applications
Kuník, Adam ; Doubrava, Marek (referee) ; Řehořek, Lukáš (advisor)
The goal of this bachelor's thesis is to get familiar with cold spray technology, as an alternative in the field of both coating application and, among other things, its use for the repair of some parts with complex shapes within additive manufacturing. It then coveres the basic principles of this method, the metal powders used, the characteristics of the device, familiarization with the issue of ballistic protection and terminal ballistics. In the second, experimental part, the quality and mechanical properties (especially the hardness, porosity, and coating thickness) of this layer produced by the above-mentioned method, as part of ballistic protection for light armored vehicles, are evaluated.
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Influence of alloying elements on the solubility of titanium in magnesium alloys
Matocha, Martin ; Buchtík, Martin (referee) ; Březina, Matěj (advisor)
This bachelor's thesis examines the influence of alloying elements on the solubility of titanium in magnesium alloys. In the theoretical part, a literature review was conducted on the topics of the creation, composition, processing, and brief analysis possibilities of magnesium alloys, with an emphasis on the potential for alloying magnesium alloys with titanium. The experimental part focused on the preparation of systems with various compositions to achieve the integration of titanium into the magnesium alloy. After preparation of the samples of the given systems, their analysis was performed using SEM/EDS and XRD. Based on the ongoing results of the samples analysis, efforts were made to optimize the holding time of the samples of the given system at a temperature of 905°C. It was found that during the stabilization of the modification of titanium, it is possible to achieve mixing of titanium, zinc, and magnesium. The condition for the formation of the modification of titanium is the highest possible temperature allowed by the system. However, the temperature must exceed at least 881°C. The stability of the modification of titanium is also supported by the absence of alloying elements that promote the stability of the modification of titanium. The mixture of elements in the aforementioned system has not yet been described in the scientific literature.
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Improving the quality of automobile wheel discs cast by the low-pressure casting method
Bělota, Martin ; Krutiš, Vladimír (referee) ; Kaňa, Václav (advisor)
The thesis deals with the identification of defects occurring in cast automotive wheels. The thesis also includes the design and experimental verification of measures that lead to an increase in the quality of production. The first chapter of the theoretical part deals with the occurrence of gases in aluminium alloys, especially hydrogen, its sources, solubility in aluminium alloys and the formation of gas cavities in castings. The second chapter describes ways of degassing the melt by vacuuming and bubbling with inert and active gases. The third chapter deals with controlled melt gasification, the purpose of melt gassing and methods of controlled gassing. The fourth chapter is devoted to the defects that occur in automotive wheels produced by lowpressure die casting technology. The fifth chapter describes the aluminum alloy AlSi7Mg0.3, which is used for the manufacture of cast wheels. It also describes the heat treatment of cast wheels. The sixth chapter deals with the practical part of the thesis, which includes the identification of defects using microscopic and radiographic methods. The next part describes the design and execution of an experiment in which Probat-Fluss MIKRO 100 was selected to improve the quality of production based on the results of defect identification. At the end of the practical part, the conducted experiment is evaluated, which also served to verify the effectiveness of Probat-Fluss MIKRO 100.
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Comparison of riveting and welding of motorcycle trunks
Pirmajer, Richard ; Slaný, Martin (referee) ; Kubíček, Jaroslav (advisor)
The work is focused on the comparison of riveting and welding technology for motorcycle trunks. The basic material is EN AW 5754 alloy with a thickness of 1.5 mm. The trunks made of this material were provided by SW-MOTECH. In the theoretical part, research was carried out on aluminium itself, its properties, types of heat treatment and weldability options. Furthermore, the CMT welding method and the piercing riveting method, which were used in the production of the trunks, were described. In the practical part, samples from both trunks, welded by CMT method and riveted by piercing rivets, were examined. Furthermore, the specimens were examined for the size of the heat-affected zone, the depth of penetration, the presence of defects, and the quality of the joint, respectively. At the end, the methods were economically evaluated.
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Porosity during welding aluminous alloys
Hájková, Alena ; Daněk, Ladislav (referee) ; Sigmund, Marian (advisor)
This thesis deals with the problem of occurrence of porosity in aluminous alloys and the methods of their repair in the company IFE. Theoretical part is aimed on the current state of porosity and the ways in which the be pores can be repaired. Used technologies of repairs are TIG welding and cementing. The practical part consists of experiment in which is used a method of cementing on specific part.
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Residential building
Šeps, Daniel ; Bartlová, Jana (referee) ; Vajkay, František (advisor)
The subject of the bachelor thesis is the design of a new building of a detached apartment building in Nová Paka in the form of project documentation for construction. The buiding is designed brick with reinforced concrete ceilings. Perimeter walls on the 1st – 3rd floor is designed ceramic brick blocks th. 300 mm with contact thermal insulation system ETICS th. 200mm, which will be equipped with silicone plaster 1,5mm. Perimeter walls on the underground floor is designed permanent shuttering DITTON 30 th. 300mm, filled with concrete C20/25 XC1 and by steel B500B insulated with extruded polystyrene XPS th. 160mm. Internal load-bearing masonry wall is designed with acoustic ceramic brick blocks th. 250 mm. Partitions are designed from acoustic partition walls. On the ceilings is a hardwood flooring because of excellent acoustic characteristics. The roof is designed as a flat green roof with extensive vegetation and with thermal isolation of minera wool and with waterproofing layer made of bituminous modified SBS strips laid in two layers. Balcony railing is designed aluminous with safety glass paneling.
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Roof structure of construction for social purposes
Bašista, Ján ; Melcher, Jindřich (referee) ; Karmazínová, Marcela (advisor)
The work treats the static recalculation of an existing roof structure of a construction for social purposes and proposes two variants of the design of a new roof structure. The construction has a rectangular ground plan of 30 m x 47 m and the roof structure is placed on the load bearing circumference concrete walls. Except for the load constituted by the function of the construction and by the climatic area, an extra load of 2 tons suspended at any place of the structure is considered because of the special requirement of working and technological equipment. The variant no. 1 is designed from the steel S355. The variant no. 2 is designed as a combination of the wood GL24h and the aluminium EN-AW 5083. Both of the variants have 11 transverse load bearing girders. The purlins are perpendicular to the girders and are placed on them. Stiffness is secured by roof stiffeners.
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Structual welding of aluminium alloy
Blahák, Petr ; Hála, Michal (referee) ; Kubíček, Jaroslav (advisor)
The project elaborated in frame of engineering studies branch 2303R002 presents a project that contains welding a structure made of aluminium alloy. There were two usable methods selected, based on literal study of welding aluminium alloys, TIG welding and friction welding, and these were compared with alternative methods of joining, hard soldering and bonding. A work procedure was made for TIG method, soldering and bonding and four experimental joins were made thereafter. Project compares these methods mainly in economical way, also in way of technological difficulties and in way of observance the strength of base materials. Project also deals with problems with lowering strength of base material in heat affected area, burn out of thin material, tendency of aluminium to fill with hydrogen, quick oxidation and consequent hard surface layer emerging on the aluminium.
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Modern Materials for Automotive Industry
Vaníček, Jan ; Fojtášek, Jan (referee) ; Hejtmánek, Petr (advisor)
This work is focused on the description of conventional and unconventional materials that are used to build a car. Individual types of materials are sorted according to their application and characterized in terms of properties and real use. The end of each chapter is devoted to possible future trends.
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