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Fracture behaviour of heat affected zone near heterogeneous weld joint
Jelínek, Vladimír ; Válka, Libor (referee) ; Juliš, Martin (advisor)
The study deals with mechanical characteristic of heterogeneous weld joint. The low carbon steel 22K and austenitic steel have been used as a experimetnal materials. The low carbon steel has special properties in basic condition. The sample has been evaluated in basic condition and after annealation. There have been evaluated impact of annealation proces to structure and mechanical charakteristics in experimental part of study. The particularised analysis of microstructure has been done by pictorial analysis. Mechanical characteristics has been examinated in both conditions by 2 different methods – measurment of microhardness according to Vickers and test of fracture toughness on compact tension specimens.
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The mechanical properties of fiber reinforcement laminates
Jílek, Jan ; Němec, Karel (referee) ; Válka, Libor (advisor)
This bachelor's thesis summarizes the current findings in the area of evaluation of mechanical properties of fibre reinforcement laminates. In the thesis an algorithm for acquiring material characteristics of laminate by calculation is introduced, the results are tested by tensile stress. Among the calculated and experimental values of material characteristics only a small difference was found. The effect of temperature on stiffening of laminate on mechanical properties is studied.
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Point Pleasant bridge collapse - casual analysis of the accident
Jagoš, Jiří ; Němec, Karel (referee) ; Válka, Libor (advisor)
The bachelor thesis is focused on the analysis of the causes of the accident of the Silver Bridge, which occurred in 1967, forty years since the introduction of the bridge to the traffic. In the work are discussed in detail all possible causes of the collapse of the bridge on the basis information and facts mentioned both directly in the inquiry reports of committees, as well as in documents and literary sources, dealing with material analysis of the structural nodes of the wrecked bridge. The work carried out critical analysis of the available and relevant information about the crash. The bachelor thesis outlines also the possible causes of the fall and collapse of the bridge from structural point of view and from terms of the material.
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Small Punch Test - assessment of the possibilities of the methodology and its limitations
Závodský, Peter ; Němec, Karel (referee) ; Válka, Libor (advisor)
The Bachelor’s thesis is aimed to sum up and consider actual state of knowledge about a relatively new method used for testing materials called Small Punch Test. There are pros and cons of the method with troubles at the application process stated in the thesis. We can read something about the basic idea of small punch testing. A big effort was spent to sort many types of tests according to used configurations of testing machines and another testing parameters. There are stated techniques used for determination some basic material properties from small punch testing also with methods of correlation to results obtained from standard material tests in the thesis.
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