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Evaluation of Cyclic Damage in Aluminum and Magnesium Alloys Using Acoustic Emission Technique
Vlašic, František ; Samek,, Jiří (referee) ; Fiala, Jaroslav (referee) ; Pazdera, Luboš (referee) ; Mazal, Pavel (advisor)
The thesis deals with the application of nondestructive testing methods (acoustic emission, electron microscopy, X-ray diffraction topography) to description and identification of stages in the fatigue process in aluminium alloys. The main contribution of this dissertation thesis consists of the approach and evaluation methodology of cyclic damage in the materials. It dealt especially with the verification of measured data by using data obtained using other nondestructive methods. The experimental results show that the field of nondestructive testing materials can fundamentally uncover the process of fatigue damage and improve current knowledge in this area. Combination of used methods has become a powerful tool for the identification and monitoring of the whole fatigue degradation process of materials.
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Scanning of acoustic emission signal by using waveguides
Bančák, Matej ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
Bachelor thesis is focused on the issue of scanning acoustic emissions from the surface of solid body and scanning with the help of acoustic waveguide placed on the solid body. The work includes the review of the present ways of scanning acoustic emissions, options of installation waveguide and propagation of waves. The practical part is focused on the experiment, which compares measured values from the surface of the test body and from the waveguide. The measurement was realized on steel of the standard quality for using a measuring instrument Dakel Xedo. The next object of this work was try to attenuate the reflected signal, which is produced by the action of force on the test body.
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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).
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Design of appliance for assembling of sealing
Vávra, Jan ; Vlašic, František (referee) ; Prokeš, František (advisor)
The object of this bachelor thesis is designing and constructing plant for manual deployment rubber gasket while production connectors to cars. Part of the work is devoted general orientation the assembly plant, another part is devoted itself alternative solutions design variants and selection of appropriate alternative solutions. The reset of this work is 3D model of plant.
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Problem Solution of the Control Mechanism of the High Voltage Disconnector
Metelka, Jiří ; Dvořáček, Jiří (referee) ; Vlašic, František (advisor)
This Bachelor‘s thesis deals mainly with the design of a safety ball clutch for the control mechanism of a high voltage disconnector made by IVEP company. This work includes a short summary about disconnectors and safety couplings in general, with concrete examples of disconnectors by IVEP and construction examples of commercially used safety clutches from number of randomly selected producers. The thesis also contains component drawings, assembly drawing and a 3D model of the complete coupling. Attached are the control measurement results of the torque moment of the completed prototype.
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Construction of the impurities discharge arrangement for the settlement tank
Stodolák, Martin ; Vlašic, František (referee) ; Prokeš, František (advisor)
This bachelor’s thesis deals with construction of the impurities discharge arrangement for the settlement tanks. The thesis consists of several concurring parts. First part addresses current situation of surface wiping solution. Second part contains proposal of several solution options. Third part deals with construction solution of chosen variant. In the following part are figured out load parameters. Last part of thesis is dedicated to visualization and description of kinematics discharge arrangement.
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Comparison of selected mechanical properties of aluminum alloys and structural steels
Belháč, Jakub ; Svoboda, Pavel (referee) ; Vlašic, František (advisor)
The subject of this bachelor´s thesis is a description of selected mechanical properties of metal materials and their comparison within aluminium alloys and constructional steels. The most common mechanical tests to quantify the mechanical properties are described here. The mechanical properties of constructional steels and aluminium alloys are separately described in subsequent chapters as well as their division and possibilities of application. The connection between structure, chemical composition and mechanical properties depending on a heat-treating process is shown.
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