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Failure analysis of the space shuttle Columbia
Neduchal, Ondřej ; Man, Ondřej (referee) ; Pantělejev, Libor (advisor)
Bachelor´s thesis is focused on the analysis of the space shuttle Columbia accident. Text firstly generally discusses materials used in aviation and cosmonautic, specifically composite materials. These are discussed firstly in general and then is the thesis focused on their strength and dynamic properties. Second half of the thesis describes the course of the last flight of the space shuttle Columbia and its subsequent demise. Emphasis is placed on the cause of the accident in which plays a crucial influence the material on the surface of the wing.
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Assessment of probable causes of corrosion damage of a mould made of cast iron
Sobola, Petr ; Pantělejev, Libor (referee) ; Man, Ondřej (advisor)
Bachelor’s thesis deals with solution of problems on glass moulds, which were exposed to the corrosion medium for up to two days causing their damage. The thesis contains theoretical analysis of the problem, layout for the corrosion experiment and its execution. Based on the experiment a conclusion was pronounced that the extent of damage which was observed was not able to be created by corrosion of initial surface without any previous defect.
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Optimization of heat treatement process for alloyed case hardenening steel
Roubalová, Jana ; Pantělejev, Libor (referee) ; Jan, Vít (advisor)
This bachelor’s thesis deals with the assessment of the influence of heat treatment on the microstructure and mechanical properties of medium alloyed steel 18CrNiMo7-6. The work contains assessment and further proposal of suitable austenitizing temperature for heat treatment. To select the optimal variants of heat treatment five different temperature modes were tested. The theoretical part describes the various methods of heat treatment, with a focus on medium alloyed steels. The practical part presents microstructure of the evaluated steel, its hardenability and hardness depending on the temperature regime of treatment.
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Assessment of probable causes of corrosion damage of a glass-shaping mould
Jíša, Jakub ; Pantělejev, Libor (referee) ; Man, Ondřej (advisor)
The aim of this thesis was to characterize briefly the issue of electrochemical corrosion in the aquatic environment with a focus on cast-iron corrosion and then decide whether the observed damage to the glass-forming mold could arise in the course of two days. A simple corrosion experiment was made in which samples of cast-iron were exposed to the shower of water for 48 hours. Corrosion damage under simulated conditions did not reach the level of damage of the mold.
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The application of legal standards in materials engineering
Večeřa, Petr ; Pantělejev, Libor (referee) ; Pavloušková, Zina (advisor)
The thesis describes points where the basic universal prescriptive system of law interferes with the questions of materials engineering. The main part of the thesis concerns legal liabilities, mainly civil liability represented with liability for defects. Basic analysis of chosen topics concerning liability for defects is done, defects are divided into groups as far as both technical and legal point of view is concerned. Consequently, the most common methods, principles and tests used for recognition and assessment of materials characteristics, both destructive and non-destructive, are described. Chapter, which deals with degradation processes follows. Integral part of the thesis are thoughts of possible types of legal liabilities, which could be important for materials engineers, with basic recommendations for contracting, as well as chosen problems connected with judicial proceedings and out of court settling of disputes. Technical standards are described with high attention, because both technical and legal public is not familiar with the legal background of technical normalisation.
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Processing Methods of Fine-grain Materials (ECAP)
Jonák, Martin ; Man, Ondřej (referee) ; Pantělejev, Libor (advisor)
Method of equal-channel angular pressing (ECAP) is very significant SPD method whereby we are able to obtain a bulk material with UFG structure. This research deals with fundamental principles of ECAP method, an influence of the constructional design of a pressing channel and factors related to processing modes on properties of a final structure. Further, this research describes some modifications of a conventional ECAP method and processes based on its principle.
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