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Trusses for Traffic Signes
Veselý, Radek ; Liškutín, Ivo (referee) ; Buchta, Stanislav (advisor)
The bachelor´s thesis deals with design of the constrution of trusses structures for vertical large format traffic signes over two-lane and three lane road lane highway. Constructoin is made up of horizontal space truss construction and column of steel tubes. The calculatin was performed manualy using Scia Engineer 2013. Loading consists of self-weight and wind load.
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Orbital welding assembly welds in the Nuclear Power by the TIG method
Lukášek, Zdeněk ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The Bachelor's thesis looks at the possibility of using orbital welding by the TIG method on mounting welds in JE Dukovany. In the opening section, we deal with the issue of weldability, primarily carbon steels. Furthermore, the work focuses on TIG welding technology, both in the manual and mechanised way it details, including the advantages and disadvantages of both variants. In the experimental section, five test samples of ferric-perlithic material pipes were welded. The samples were assembled to simulate possible combinations that occur during pipeline assembly. Non-destructive and destructive controls followed, verifying the quality and mechanical properties of the resulting weld joints. In conclusion, the results of the trials were assessed and evaluated.
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Computational Modelling of Welded Joints
Schiffer, Adam ; Řehák, Kamil (referee) ; Dlugoš, Jozef (advisor)
Welded joint is nowadays a very widespread method of joining materials. Welded joints are produced by very complex technological processes, and therefore it is necessary to assess their behavior. Currently, a large number of FEM software products has been developed, offering better efficiency in the design of welded joints. This work contains a summary of selected software and their methodologies in computational modelling of welded joints. In addition to the description of individual software, it also contains their comparison on the basis of set criteria. The possibility of including phase transformations in the analysis of the welding process was chosen as the main criterion. A survey of the availability of student licenses was also carried out.
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Fatigue strength of welded joints
Čermáková, Markéta ; Dubnický, Lukáš (referee) ; Sladký, Martin (advisor)
The assessment of the fatigue life of welded joints is a very complex discipline requiring careful analysis. In practice, expensive testing of large numbers of samples is often required to assess it. Although some recent advances have been made in analytical prediction, the results are still not satisfactory. This bachelor thesis deals with the assessment of fatigue life of welded joints using the finite element method (FEM). The first part of the thesis is devoted to a literature search, the introductory part of which gives a brief overview on the topics of welding and fatigue. Then, the paper describes in detail the different procedures to assess the fatigue life of welded joints. The second part is devoted to the development of a simple FEM model of the welded joint. The model is then used to estimate the fatigue life using the MSC Patran/Nastran program. Three approaches are tested, namely nominal, hotspot and notch stress. The final section compares the different approaches and a comparison between theoretical and experimentally observed data is also made.
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Design of a portable machine for machining large diameter pipes
Boháč, Josef ; Pavlík, Jan (referee) ; Tůma, Jiří (advisor)
This diploma thesis deals with the design of a portable machine for machining large diameter pipes. This thesis is divided into research, calculation, design, and construction parts. The introductory part is devoted to research in the field of joining large diameter pipes, with a focus on flanged and welded joints. Based on the findings from the research part, several construction solutions were considered. In the next part, the most suitable design solution was selected using a multicriteria analysis technique and subsequently elaborated on in detail. The following chapter deals with the calculation of maximal cutting forces and the selection of motor. An air motor was chosen as the most suitable option for the proposed machine. This part is followed by the computational part, which includes strength calculations for the critical parts of the machine. The final part of the thesis is devoted to the construction itself and the description of the individual construction nodes of the machine. The thesis also includes a 3D model, drawings of selected parts, and an assembly drawing.
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Computational Modelling of Welded Joints
Schiffer, Adam ; Řehák, Kamil (referee) ; Dlugoš, Jozef (advisor)
Welded joint is nowadays a very widespread method of joining materials. Welded joints are produced by very complex technological processes, and therefore it is necessary to assess their behavior. Currently, a large number of FEM software products has been developed, offering better efficiency in the design of welded joints. This work contains a summary of selected software and their methodologies in computational modelling of welded joints. In addition to the description of individual software, it also contains their comparison on the basis of set criteria. The possibility of including phase transformations in the analysis of the welding process was chosen as the main criterion. A survey of the availability of student licenses was also carried out.
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Analysis of welded joints after fatigue tests
Kučera, Ondřej ; Doubrava, Marek (referee) ; Havlík, Petr (advisor)
This bachelor thesis deals with analysis of welded joints after fatigue tests . The first part of this thesis, literary research, discusses weldability of carbon steels and low-alloy steels and effect of chemical composition on weldability of materials. Further there are zones of welded joints, their microstructure and mechanisms applied described in this thesis. There are defects occurring in welded joints and their common causes and remedies described in the part of literary research dealing with defects. And the final part of the literary research deals with material fatigue, fatigue of welded joints and effect of defects, fusion zone and heat-affected zone on the fatigue of welded joints. In the experimetal part of bachelor thesis there is described experimental material, results obtain process and discussion of results.
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Fatigue evaluation methods for pressure equipment utilising numerical analysis results
Boleloucký, Václav ; Lošák, Pavel (referee) ; Létal, Tomáš (advisor)
Diplomová práce se zabývá hodnocením únavové životnosti v okolí konstručního uzlu tlakové nádoby, kde vzniká výrazná koncentrace napětí a je zde předpoklad primárního vlivu na únavu materiálu. Konkrétně se jedná o místo přechodu kontrolního otvoru do pláště analyzovaného zařízení. Práce obsahuje teoretickou a praktickou část. V teoretické části jsou představeny pojmy a metody hodnocení, související s danou problematikou. Na základě těchto metod je provedena analýza konstrukčního uzlu tlakové nádoby. Analýza je provedena metodou konečných prvků na skořepinovém a objemovém modelu nádoby v softwaru ANSYS Workbench, její výsledky dále zpracovány a vyhodnoceny dle aktuálního návrhu úpravy evropské harmonizované normy EN 13445--3, kapitoly 18. Výsledky analýz jsou hodnoceny v závěru práce.
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Utilization of laser welding methods for fixation of electrotechnical sheet bundles
Adam, Tomáš ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
Thesis deals with individual technologies of packaging stator sheets and their use in practice. The greatest emphasis is placed on welding technologies, especially on the differences between the individual methods. The experimental part of the thesis is focused on finding suitable parameters for welding the stator package using a laser with a special wobling head. The samples were evaluated in terms of penetration depth, the number of defects, especially pores and grain coarsening.
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Orbital welding assembly welds in the Nuclear Power by the TIG method
Lukášek, Zdeněk ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The Bachelor's thesis looks at the possibility of using orbital welding by the TIG method on mounting welds in JE Dukovany. In the opening section, we deal with the issue of weldability, primarily carbon steels. Furthermore, the work focuses on TIG welding technology, both in the manual and mechanised way it details, including the advantages and disadvantages of both variants. In the experimental section, five test samples of ferric-perlithic material pipes were welded. The samples were assembled to simulate possible combinations that occur during pipeline assembly. Non-destructive and destructive controls followed, verifying the quality and mechanical properties of the resulting weld joints. In conclusion, the results of the trials were assessed and evaluated.
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