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Residual fatigue life estimation of railway wheelset
Pokorný, Pavel ; Zouhar, Michal (referee) ; Náhlík, Luboš (advisor)
The first part of this master's thesis deals with the high cycle fatigue of materials, especially on growing cracks using linear elastic fracture mechanics. Much of this work is focused on the concept of stress intensity factor. This concept is nowadays one of the most widely used concepts for describing a body with crack. The first part ends with theoretical approaches to determine the residual fatigue life of the body with a crack. The second part of this master's thesis is focused on the determination of residual fatigue life of a specified railway wheelset. An existence of crack-like defect is assumed at the railway wheelset. The goal of this master's thesis is to estimate how long it will take to grow from initial defect to a critical crack length. The last part of this master's thesis is devoted to addiction order load cycles on crack growth rate.
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Design of a hand-lever draisine
Uhrovič, Jakub ; Otipka, Václav (referee) ; Rekem, Jakub (advisor)
The thesis focuses on the design and construction of a hand lever draisine, which, upon completion, is intended to serve as a tourist attraction at the KŽM Vrútky museum in Martin, Slovakia. The first part of the thesis gives brief information about the history and purpose of hand lever draisines and describes their construction. The second part of the thesis focuses on the actual design of the proposed solution and utilizing the information gathered in the first part. It provides a detailed description of the individual design solutions for the draisine. In the third part, the force actions on the elements of the mechanism are investigated. Subsequently, the strength characteristics of the selected parts are verified using analytical calculation methods. Finally, in accordance with the requirements, a drawing documentation of specific parts is prepared.
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Residual fatigue life estimation of railway wheelset
Pokorný, Pavel ; Zouhar, Michal (referee) ; Náhlík, Luboš (advisor)
The first part of this master's thesis deals with the high cycle fatigue of materials, especially on growing cracks using linear elastic fracture mechanics. Much of this work is focused on the concept of stress intensity factor. This concept is nowadays one of the most widely used concepts for describing a body with crack. The first part ends with theoretical approaches to determine the residual fatigue life of the body with a crack. The second part of this master's thesis is focused on the determination of residual fatigue life of a specified railway wheelset. An existence of crack-like defect is assumed at the railway wheelset. The goal of this master's thesis is to estimate how long it will take to grow from initial defect to a critical crack length. The last part of this master's thesis is devoted to addiction order load cycles on crack growth rate.
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