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Types of fatigue tests and methods of data processing
Lamrich, Richard ; Halabuk, Dávid (referee) ; Vosynek, Petr (advisor)
Bachelor thesis is focused on fatigue testing and creating of S-N curves. In the first part three main stages of fatigue life are processed in order of making theoretical knowledge needed. Next the thesis is focused on dividing methods for making these tests and machines that are used for these tests and shows under which circumstances they are appropriate to use. Last part is dedicated to methods of creating of S-N curves.
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Fatigue endurance of extruded Mg alloy AZ91E
Sobola, Petr ; Štěpánek, Roman (referee) ; Pantělejev, Libor (advisor)
This thesis deals with fatigue behaviour of magnesium alloy AZ91E produced by extrusion. In the frame of this work, basic mechanical characteristics and data from performed fatigue tests were obtained. Further metallographic analysis of microstructure and fractographic analysis of broken specimens after fatigue tests were carried out.
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Fatigue Properties of Ultra-fine Grain Copper Produced by ECAP Method
Navrátilová, Lucie ; Němec, Karel (referee) ; Pantělejev, Libor (advisor)
This diploma thesis describes properties of ultra-fine grain Cu prepared via ECAP procedure. The influence of fatigue loading with positive mean stress on S-N curve (i.e. fatigue life), cyclic plastic behaviour and grain size was investigated. It was found that tensile mean stress leads to shorter lifetime in comparison with fatigue loading with zero mean stress. During main part of the lifetime, significant hardening of UFG Cu was observed. There is no distinct effect on microstructural orientation and stability.
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Únavové parametry betonu pro předepjaté vzorky
Seitl, Stanislav ; Juřinová, E. ; Keršner, Z. ; Bílek, V.
The paper presents values of basic fatigue parameters measured on three-point bending specimens of concrete for pre-stressed elements. These specimens are the most frequently used for fracture laboratory testing, especially of quasi-brittle cement-based composites. According to the regression technique, pilot Wöhler curve for predicting the fatigue life of pres-stressed concrete element is suggested. Keywords of the paper are fatigue/fracture parameters and cement-based composite
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