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Analysis of Tube Bulging Process
Zdráhala, Radim ; Císařová, Michaela (referee) ; Peterková, Eva (advisor)
The diploma thesis is focused on the analysis of the behavior of the thin-walled tubular test specimen during the technological test of the liquid draining of the tubes. The test specimen ‘in the form a tube was made of austenitic stainless steel 17 240 (1.4301, X5CrNi18-10). During the experiment, the radial expanding tool was quasi-statically charged by the internal fluid pressure. In the introductory part, the thesis focuses on the stress-strain description of the method of tube bulging and possible ways of detecting the strain of material during forming. The experimental part is primarily focused on the analysis of the test sample that was obtained from the experiment. Theoretical approaches were used to analyze the real test sample to detect strain and stress in material, numerical simulation of the bulge process and 3D ATOS scanning device, which helped clarify behavior tube during bulging process. At the end of the thesis is proposed possible design of the tool. This modification should contribute in the future to the full functionality of the radial expanding tool, or the bulging of the tube by liquid.
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Realization of opportunities for research of formation and dynamics of bubbles and microbubbles
Spalová, Karolína ; Vondrášek, David (advisor) ; Bažant, Filip (referee)
UNIVERZITA KARLOVA FAKULTA T LESNÉ VÝCHOVY A SPORTU Realizace možností pro výzkum vzniku a dynamiky bublin a mikrobublin Bakalářská práce Vedoucí bakalářské práce: Vypracovala: Mgr. David Vondrášek Karolína Spalová Praha, 2016 Prohlašuji, že jsem záv rečnou bakalářskou práci zpracovala samostatn a že jsem uvedla všechny použité informační zdroje a literaturu. Tato práce ani její podstatná část nebyla předložena k získání jiného nebo stejného akademického titulu. V Praze, dne …………………………… podpis diplomanta Evidenční list Souhlasím se zapůjčením své diplomové práce ke studijním účelům. Uživatel svým podpisem stvrzuje, že tuto diplomovou práci použil ke studiu a prohlašuje, že ji uvede mezi použitými prameny. Jméno a příjmení: Fakulta / katedra: Datum vypůjčení: Podpis: ______________________________________________________________________ Poděkování Touto cestou bych ráda pod kovala vedoucímu bakalářské práce Mgr. Davidu Vondráškovi za trp livost, cenné rady, v novaný čas a odborné vedení. Dále bych cht la pod kovat panu Martinu Hrubému za poskytnutí své dílny a pomoc při prvních pokusech m ření, Ing. Ondřeji Novákovi, Ph.D. za odborné rady před a b hem pilotního m ření a RNDr. Martinu Vohníkovi, Ph.D. za poskytnutí laboratoře. Abstrakt Název: Realizace možností pro výzkum vzniku a dynamiky bublin a...
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The Tool for a Radial Expanding of Tubes by Liquid
Horák, Michal ; Lidmila, Zdeněk (referee) ; Peterková, Eva (advisor)
The submitted diploma thesis is focused on problematic of a radial expanding of tubes. In the first part of thesis, there is a summary of possible theoretical formulas for determining the stress-strain material parameters for biaxial bulging test of tube by liquid. Also there are showed several options for testing tools used in research abroad. The work also contains technological and control calculations for the selected test sample from the tube of steel 17 240 (1.4301). At the end of thesis, there are key points for tool design and there is also presented the proposed the test tool for a radial expanding of test sample of tube to the free space and with firmly fixed the ends of tube in the tool.
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Monitoring the impact of ultrasonic energy to the leveling of thick film pastes
Pokluda, Tomáš ; Buršík, Martin (referee) ; Řezníček, Michal (advisor)
This bachelor thesis is focused on the problem of levelling of a profile by ultrasound after printing thick layer pastes and on electrical resistance and geometrical dimensions changes. It describes a creation of hybrid integrated circuits, thick film technology and the screen printing method. It also includes basics of fluid physics, basics of fluid rheology, and description of principles of the used ultrasound transducer. Records of the levelling measurements are presented through the use of photographs, comments, tables and graphs.
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Navier-Stokesova equation - solution of the real liquid
Krausová, Hana ; Čermák, Libor (referee) ; Fialová, Simona (advisor)
This thesis deals with the Navier-Stokes equations for real, compressible fluid with first and second viscosity. The method of expansion into a series of eigenmodes of vibration is chosen to solve the Navier-Stokes equations. The general relations of the expansion coefficients and the eigenmode shapes are given for 1D-, 2D- and 3D-flows. The specific formulae of eigenmodes of vibration are determined only for 1D-flow. The final form of the pressure function is analysed using Matlab software.
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Diagnostics of the perspective insulating liquids
Spohner, Milan ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This work deals with the classification and diagnosis of electrical insulating liquids. Furthermore, the theoretical part describes the mathematical and physical principles of these liquids. The automated workplace was compiled with development environment VEE Pro for measurement of viskosity and control thermostat medingen and modifiable components for measuring complex permittivity in the frequency range. In the experimental part was carried out measurements of selected material parameters, investigated the effect of difficult conditions and made the mathematical evaluation of physical phenomena.
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Sheet metal forming using liquid
Fries, Petr ; Císařová, Michaela (referee) ; Řiháček, Jan (advisor)
This work is focused on unconventional technology using liquid as forming medium. The thesis presents the principle of forming methods hydroforming and its variations, wheelon, Flexform, hydromechanical drawing and explosive forming with examples of parts produced individual methods. A comparison of their advantages and disadvantages with conventional production methods.
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Utilization liquid in tubes shaping
Vilda, Dalibor ; Císařová, Michaela (referee) ; Podaný, Kamil (advisor)
This publication elaborates on work about technologies, which utilize liquid as forming media in tubes shaping. There is a description of methods like low-pressure, high-pressure and pressure-sequence hydroforming and radial expanding by a liquid. A part of the work is also evaluation of individual methods, their advantages and disadvantages and examples of use in a practice.
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The use of fluid medium in forming technologies
Březina, Vít ; Peterková, Eva (referee) ; Podaný, Kamil (advisor)
This publication includes a research of currently used technologies with liquid as a forming or supporting medium. There is a description of methods of Hydroform, ASEA, Wheelon, Flexform, hydro-mechanical forming, Pillow hydroforming and groups of high-pressure, low pressure and pressure sequence hydroforming. The publication also includes analysis of the media used for lubrication of contact surfaces during the process of forming and operating fluids. The publication shows examples of companies which are using this technologies and samples of their products.
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Relevance of the hydrostatic and hydrodynamic paradox
Vacula, Jiří ; Haluza, Miloslav (referee) ; Fialová, Simona (advisor)
This bachelor’s thesis is concerned with the explanation of the hydrostatic and hydrodynamic paradox existence. Above all hydrostatic paradox is not in general properly explained which causes additional puzzle. Therefore the aim of this thesis is to find real reasons of these effects and in addition to check up possible consequences of liquid compressibility.
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