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Study of the properties of fillers to the composites requiring high temperature resistance
Vovesný, Václav ; Gross,, Tomáš (referee) ; Bydžovský, Jiří (advisor)
The diploma thesis is focused on the behaviour of natural and synthetic aggregates and their behaviour in polymer – cement composites, while being exposed to high temperature. The processes, happening in aggregates and mortar under the thermal load, were described in the theoretical part of the thesis same as the testing of heat effects on the aggregates and mortar. Further, the influence of high temperature on each component of concrete was described, followed by the suggestion of the appropriate components for concrete exposed to high temperature. Various aggregates were tested in the experimental part of the thesis. The basic physical and mechanical properties of aggregates were examined same as their mineralogical composition with using XRD, DTA and SEM methods. At the mortar, the influence of high temperature on the concrete density, compressive strength and tensile strength was defined. The gained knowledge was evaluated in the final part of the thesis
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Study of the properties of laser welds aluminum alloy grade 5000
Černohous, Filip ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
In working to address the properties of laser welds of aluminum class 5000th These alloys are characterized by low strength and good corrosion resistance. Created a few sample welds on Yb-YAG optical laser, which is subjected to mechanical testing . Procedures are provided in the work of laser technology and welding, as well as general properties and defects in welds. Made welds was evaluated and listed the best welding parameters of the studied process parameters .
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Coated cemented carbides and their effective use
Pavlovský, Tomáš ; Dvořáček, Jan (referee) ; Humár, Anton (advisor)
This thesis deals with coated cemented carbides, which are used for the manufacture of cutting tools. The introductory section provides an overview of the most common tool materials. The main part focuses on the production of coated SK, coating methods, types and properties of coatings. The final section deals with coated cemented carbide product range in the world's leading producer of tools and tool materials, tools and recommended working conditions for their effective use.
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Numerical simulation of mechanical properties of cast irons
Haluza, Jakub ; Bouška, Ondřej (referee) ; Krutiš, Vladimír (advisor)
Diploma thesis in the first part deals with the production, properties and application of compacted graphite iron. After then calculation model which is used in ProCAST software for the predicting mechanical and structural properties of compacted graphite iron is presented and differences between versions 2010 and 2011 are shown. The last part of the thesis deals with simulation of mechanical and structural properties on the test specimen and real casting, which is poured in Heunisch foundry Ltd. and results of the simulation and measured values are compared.
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Cermets and theirs effective use
Hanousek, Petr ; Prokop, Jaroslav (referee) ; Humár, Anton (advisor)
This thesis deals with cermets as a tool material. In the Preamble, the types, production, labeling and properties of cermets are analyzed. The main part of the thesis introduces cermets in the range of manufacturing by the world leading producers of tools and tool materials. The Conclusion of the thesis summarizes the evaluation of tool cutting abilities and recommended working conditions guaranteeing the efficient use of cermets.
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Types of Prices in the Property Market
Beránková, Martina ; Bejšovec, Jaroslav (referee) ; Staněk, Roman (advisor)
The aim of my diploma thesis is to outline the issues of finding out the prices and differences between the prices at the property market and also to clarify the basic terms from the field of property evaluation and the property market. In the introductio of my theses I will be defining the basic terms connected with the given topic. After that I will introduce the readers to the issues of differences between the price and value and also into the issues of the real estate market. I will describe particular types of prices and values, subjects of the property markets and the relationship at the property market. In the following part of my work I will mention the essence of evaluation of properties, I will define the basic terms, methods of evaluation and description of evaluation. However it is not only a blunt list of operations connected with this topic, but it is help to the reader to be better orientated on proceeding and to be familiar with the bacis terms connected with this topic. In the last practical part I will focus on the various types od finding out prices by using different methods.
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Measurement of the properties of operation amplifier
Lacko, Michal ; Sekora, Jiří (referee) ; Kolář, Radim (advisor)
This thesis includes a survey of operation amplifiers used for biological signal measurement. The first part is focused on the description of amplifier’s properties which are important in biomedical engineering. The next part describes several applications (virtual instruments) which measure selected properties. These applications are created with the help of the programming environment LabView 7.1, the measuring card NI PCI-6221 and a suggested product. The project includes four applications: measuring of frequency characteristics, automated measuring of frequency characteristics, measuring of input offset voltage, and measuring of common-mode rejection.
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Targeted Preparation of Composite Based on PP with Inorganic Micro-, or Nanofiller with Different Adhesive Interlayer
Dombková, Julie ; Krčma, František (referee) ; Nezbedová, Eva (advisor)
The diploma thesis studies composite of PP and filler particle. As a particle filler was used commercially available CaCO3 (SOCAL 31). The submitted thesis had a goal to find new approaches and technologies of filler surface treatment in order to improve properties of composite materials. The plasma discharge behind static pressure was used for the surface treatment of the fillers. These fillers were afterwards analyzed by using of sedimentation analysis, turbidimetry, infra-red spectroscopy (FT-IR), X-ray diffraction analysis (XRD), scan electron microscopy (SEM), transmission electron microscopy and particle size distribution by laser diffraction. The composites with various volume parts of the fillers were prepared in PIB and studied by short-time tests. Furthermore, the influence of an adhesive layer on fracture mechanical properties of prepared composite was study. Regarding to experimental demand, there was not possible to realize long-term mechanical properties.
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