National Repository of Grey Literature 44 records found  beginprevious30 - 39next  jump to record: Search took 0.00 seconds. 
Modern trends in radiographic procedures and methods in defectoscopy
Skřivánková, Vendula ; Vlašic, František (referee) ; Juliš, Martin (advisor)
Presented thesis deals with modern trends and techniques in radiographic methods of crack detection which are recently used in engineering practice. In the first part, conventional (analogue) radiography principles based on creating a visible image of tested object to radiographic film are discussed. The next part is aimed to the digital radiography and radioscopy. To digitize existing X-ray film images, application of storage phosphor plates (CR), flat panels (DR) and computed tomography (CT).
Modern methods in nondestructive testing of materials using ultrasound
Šimeček, Radek ; Stránský, Lubomír (referee) ; Juliš, Martin (advisor)
Theme of this bachelor thesis is nondestructive testing of materials by modern ultrasound methods. In the first part are mentioned defects of mechanical components, which can be detected by ultrasound. This is followed by a description of conventional ultrasound technique, including a list of the major disadvantages and limits. In the second part are analyzed the modern ultrasonic methods TOFD and Phased Array. It describes not only the principle of these techniques, but there are also provided practical examples of their application.
Structure and properties of welded joints of steam turbine rotor
Machala, Jan ; Hutařová, Simona (referee) ; Juliš, Martin (advisor)
This thesis deals with the assessment of the structural-mechanical properties of welded joints of steam turbine rotor. Experimental weld material is low alloy steel 30CrMoNiV5-11 in the state after the artificial degradation. The theoretical part of the literary researches the issue, focusing on the weldability of different types of steel used in the energy industry, the metallurgical processes in welding and provides an overview of the most important methods of welding. Great attention is paid to the evaluation of weld quality in accordance with relevant standards and destructive and non-destructive testing of welded joints. In the experimental part of this work was carried out measurements of hardness and microhardness of the weldment by Vickers and evaluation of the microstructure by light microscopy. The obtained values and information about the properties of the material after artificial degradation were compared with previously obtained experimental results in the default state (after annealing).
Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C
Šulák, Ivo ; Juliš, Martin (referee) ; Podrábský, Tomáš (advisor)
Nickel based superalloys are mainly used for high-temperature applications in energetic and aerospace industry. They are exposed to extremely aggressive environment at high temperature with interaction between fatigue and creep processes, oxidation and erosion. Application of protective surface coating is the right way how to increase the lifetime while increasing performance of machine. Theme of this bachelor’s thesis is to investigate the fatigue parameters of superalloy In713LC at 800 °C and the comparison of these parameters between materials with a protective coating based on Al or Al-Si and material without coating.
The Comparison of Composite and Conventional Materials in the Bicycle Industry used
Ševeček, Jan ; Juliš, Martin (referee) ; Němec, Karel (advisor)
This final thesis summarizes the basic information on traditional materials for the manufacture of bycicle frames in comparison with composite materials. It describes the mechanical properties, technological characteristics, methods of forming and heat treatment of alloys. It informs of their use in bicycle industry.
Materials used in Aerospace Industry
Večeřa, Jiří ; Juliš, Martin (referee) ; Hutařová, Simona (advisor)
This bachelor’s thesis deals with contemporary aerospace materials. First part of this thesis is engaged in aircraft construction. There is description of the most important components of fuselage and jet engine, its function, various types and materials, which is used to its production. Other part is engaged in these materials. There are aluminum alloys, titanium base alloys, nickel and cobalt base superalloys, heat-resisting steels and composites.
The use of Composite Materials for Bicycle Frames Building
Plundrák, David ; Juliš, Martin (referee) ; Němec, Karel (advisor)
This bachelor’s thesis summarizes the basic basic information about the manufacture of composites and composite bicycle frame. Included are mechanical, physical and chemical properties. The work includes a comparison of composite materials with other materials and gives an overview of thein use in bicycle industry.
Weldability of steels for steam turbine parts
Jech, David ; Hutařová, Simona (referee) ; Juliš, Martin (advisor)
The aim of contemporary standard welding technologies is to create compact welds with high value of solidity and toughness in laboratorial and operational conditions. This welding technology is asserted in new creep - resisting steels on basis of steel CrMoV and CrMoNiV, which have high value of solidity and creep - resistance. The thesis deals with problems connected with the weldability of steels for steam turbine rotors and it´s aim is to interpret the structural and mechanical features of the weld joint for material combinations under consideration. For the assessment of weld joint features has been used measuring of micro hardness and hardness according to Vickers, microstructure was observed by methods of light microscopy.
New trends and material usage in bicycle frame design
Jelínek, Vladimír ; Němec, Karel (referee) ; Juliš, Martin (advisor)
Thesis in its first part summarizes the evolution of the bicycle from the draisine to the low wheels with a focus on the material of the frame of the bicycle. Also discussed in this section is an overview of small structural modifications, which were gradually used on a bike, like Bowden brake or the first type of transmission system. In the second part, the thesis describes the operating principles and types of suspension forks and disc brakes. Mentioned are materials that are currently used for bike frames with a focus on the advantages and disadvantages of each material used and its future anticipated use.
Corrosive Degradation of Austenitic Steels
Vykoukalová, Tereza ; Juliš, Martin (referee) ; Klakurková, Lenka (advisor)
The main requirement imposed on stainless steel is a high corrosion resistance in aggressive environment. The main aim of the thesis is a numerous group of corrosion resistance stainless steels, i.e. the stainless steel with austenitic matrix. Increased attention is paid to the corrosive attack and corrosion rate of three chosen materials with austenitic matrix in four different corrosive environments (30% solutions of sulphuric acid, nitric acid, acetin acid and sodium chloride). The method of light microscopy was used to study corrosive degradation of different materials.

National Repository of Grey Literature : 44 records found   beginprevious30 - 39next  jump to record:
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