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Cutting forces when drilling fibre reinforced composites
Režný, Tomáš ; Sedlák, Josef (referee) ; Humár, Anton (advisor)
This master´s thesis is focused on fibre–filled composite materials, their distribution, labeling, usage, development and production. The aim of this work is complex processing of acquired technical knowledge, and evaluation of technological rehearsals of drilling composite materials which are reinforced by glas fiber and prepreg in terms of the impact of the machined material, wor-king conditions and the tool, and its wear to the feed force value and torque.
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Cutting forces when milling fibre reinforced composites
Martének, Libor ; Forejt, Miloslav (referee) ; Humár, Anton (advisor)
The thesis is focused on composite materials with a view to their classifi-cation, identification, usage, current trends in production and development and possibilities of effective machining. As a part of this thesis, there is an evaluation of experimentally measured values during technological testing of milling of a fibre reinforced composite with a polyester matrix reinforced by fiberglass. The technological testing was performed with a view to measure certain values, i.e. impact on machined material, working conditions for a tool and its abrasion equal to the values of components of cutting force. From the values obtained from the testing, a general analysis of cutting force when milling was created containing overall technical and economical evaluation.
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Study of the properties of concrete with reinforcement, intended for the production of concrete egg-shaped tubes
Šťastný, Antonín ; Hela,, Vlastimil (referee) ; Hubáček, Adam (advisor)
This diploma thesis examines the properties of concrete with reinforcement, designed for the production of a concrete egg-shaped tubes . The stress is put on using various types of fiber reinforcements. Theoretical part is divided into 4 subsections. The topic of the first subsection is a concrete in general. Second subsection deals with various technology of production of concrete pipes. The third subsection is focused on description and summary of basic properties of concrete and reinforced concrete tubes. The last subsection deals with standardized procedures for testing concrete. Experimental part of this thesis is divided into two subsection. First subsection deals with design of a reference sample. Six different samples of a concrete were designed and their rheological properties were tested. Second subsection deals with the additi-on of various types of fiber reinforcement to the reference sample. Eight different admixtures of a concrete were added to the reference sample. Properties of these admixtures were tested in fresh and hardened state.
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Study of rheological properties of concrete with the addition of low-temperature plasma treated polymer fibers
Gromeš, Vít ; Herka, Petr (referee) ; Bodnárová, Lenka (advisor)
Polypropylene fibers are used in concrete mixtures to avoid early cracks during shrinkage. Low thickness of each fiber and low density are reasons, why these fibers are effective in small dosage. Their disadvantages are smooth surface and hydrophobic character of polypropylene, thus it is necessary to improve their surface for better spread during mixing and to reach needed adhesion between fibers and cement paste. In present time are using chemical solutions applied on surface of the fibers to provide better water absorption, but the trend is reducing of using chemicals in industry and this situation demands new technology. There is possible solution, polypropylene fibers treated by low-temperature plasma. This method was developer by cooperation Masaryk University in Brno with company KrampeHarex and Brno Universiry of Technology. The goal of this thesis is to bring comparison, of influence on rheology properties of fresh concrete, between admixed the fibers with applied chemical layer and low-temperature plasma treated polypropylene fibers.
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Autonomous generator of test scripts
Horký, Stanislav ; Šimek, Václav (referee) ; Kolouch, Jaromír (advisor)
The subject of this master thesis are state machines and their testing. To this purpose, an application is described, which is able to test these state machines autonomously. Application have two parts, first generator and editor of data is built and second part is testing procedure, which is able to test state machines in question and to give corresponding test report.
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Application of thermochromic compounds in polymeric materials
Slánská, Petra ; Petrůj, Jaroslav (referee) ; Kučera, František (advisor)
V textilním průmyslu je v dnešní době veliká konkurence. Každá novinka může znamenat velký zisk. Tato diplomová práce se bude zabývat aplikací termochromních přísad (látka reagující na teplotu změnou své barvy) do polymerní matrice, konkrétně polypropylenu, a jeho další zpracování u výrobce technického polotovaru - výroba vláken. Po výrobě vzorků bude provedeno jejich testování. Porovnají se vlastnosti polypropylenu s a bez termochromních přísad a zhodnotí se, nakolik tyto přísady ovlivňují vlastnosti polypropylenu. Ze získaných výsledků se stanoví možnost využití termochromních přísad v textilním průmyslu.
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Transparent fibre reinforced ceramics
Lövy, Vít ; Drdlík, Daniel (referee) ; Chlup, Zdeněk (advisor)
This bachelor thesis summarizes possibilities of toughening of ceramic materials with various types of fibres and describes the basic principles for preparation of transparent fibre-reinforced composite materials. The role of fibre-matrix interface and the measurement methods enabling estimation of the interfacial strength and other characteristics are explained. The single fibre push-out test using a standard indentation technique was chosen for interfacial parameters determination of the composite consisting from a borosilicate matrix reinforced by SiC fibres in the practical part of this work.
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Fibres from the renewable sources
Uchytilová, Markéta ; Bálková, Radka (referee) ; Kotlík, Josef (advisor)
This bachelor thesis deals with the production of textile from the environmental perspective. The aim of this work is analyzing the possibility of replacement of basic raw materials used for production of natural and synthetic fibers by using raw materials derived from renewable sources. Using fibers from renewable sources should eliminate the problem of limited availability of primary raw materials for textile fibers and reduce the amount of synthetic waste.
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