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Extremely low cycle fatigue life of non-ferrous alloys
Judas, Jakub ; Kohout, Jan (referee) ; Zapletal, Josef (advisor)
This thesis is focused on fatigue behaviour of aluminium alloy 2024-T351 in low cycle and extremely low cycle fatigue regime. Test specimens were firstly subjected to quasi-static tensile and compression tests to establish basic mechanical properties of the experimental material. Fatigue tests were conducted in strain-control mode, when cyclic plastic response and S-N curves were determined. All of the experiments were conducted at room temperature. Shapes of mechanical hysteresis loops are dependent on the strain amplitude and clearly exhibit cyclic plasticity of the alloy. Cyclic deformation curve was fitted by power regression function and subsequently compared with the tensile test. Experimental data of the S-N curves were fitted by Manson-Coffin and Wöhler-Basquin law. The discrepancy of the fatigue data was observed in the extremely low cycle fatigue regime. Based on this phenomenon, new regression function was used to overcome shortening of fatigue life in the extremely low cycle regime.
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Analysis of Some Indicators of Hospital Vyškov Using Time Series
Vlašic, Petr ; Štěpánková, Vladěna (referee) ; Kropáč, Jiří (advisor)
This bachelor thesis deals with some important indicators of hospital Vyskov using time series. The first part is the theoretical knowledge of statistical methods, namely time series. And the second part is given a practical part, which focuses on the analysis and processing of selected indicators. These indicators are statistically and graphically depicts the functions and are interpreted as simple as possible so that everyone could understand. The final part of this work consists of future forecasts, and advice on how to achieve this forecast.
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Software Application for Assessment of Selected Indicators
Pavlíček, Ondřej ; Křápek, Milan (referee) ; Doubravský, Karel (advisor)
The thesis is focused on the design of a software application that uses statistical methods to assess selected economic data of the company. The first, theoretical part of the thesis explains the concept of Financial and Statistical Theory, which serves as a basis for creating own software application. In the following part, the author analyzes a specific company, its requirements, deals with the market in which it operates, and evaluates the selected economic indicators. The final part deals with the design of the application itself, which is used for data analysis and proposes solutions to improve the current situation.
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Software Application for Assessment of Selected Indicators
Pavlíček, Ondřej ; Křápek, Milan (referee) ; Doubravský, Karel (advisor)
The thesis is focused on the design of a software application that uses statistical methods to assess selected economic data of the company. The first, theoretical part of the thesis explains the concept of Financial and Statistical Theory, which serves as a basis for creating own software application. In the following part, the author analyzes a specific company, its requirements, deals with the market in which it operates, and evaluates the selected economic indicators. The final part deals with the design of the application itself, which is used for data analysis and proposes solutions to improve the current situation.
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Extremely low cycle fatigue life of non-ferrous alloys
Judas, Jakub ; Kohout, Jan (referee) ; Zapletal, Josef (advisor)
This thesis is focused on fatigue behaviour of aluminium alloy 2024-T351 in low cycle and extremely low cycle fatigue regime. Test specimens were firstly subjected to quasi-static tensile and compression tests to establish basic mechanical properties of the experimental material. Fatigue tests were conducted in strain-control mode, when cyclic plastic response and S-N curves were determined. All of the experiments were conducted at room temperature. Shapes of mechanical hysteresis loops are dependent on the strain amplitude and clearly exhibit cyclic plasticity of the alloy. Cyclic deformation curve was fitted by power regression function and subsequently compared with the tensile test. Experimental data of the S-N curves were fitted by Manson-Coffin and Wöhler-Basquin law. The discrepancy of the fatigue data was observed in the extremely low cycle fatigue regime. Based on this phenomenon, new regression function was used to overcome shortening of fatigue life in the extremely low cycle regime.
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|
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Analysis of Some Indicators of Hospital Vyškov Using Time Series
Vlašic, Petr ; Štěpánková, Vladěna (referee) ; Kropáč, Jiří (advisor)
This bachelor thesis deals with some important indicators of hospital Vyskov using time series. The first part is the theoretical knowledge of statistical methods, namely time series. And the second part is given a practical part, which focuses on the analysis and processing of selected indicators. These indicators are statistically and graphically depicts the functions and are interpreted as simple as possible so that everyone could understand. The final part of this work consists of future forecasts, and advice on how to achieve this forecast.
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