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Assessment of Failures as Causes of Car Accidents
Řehák, Miloslav ; Brožek, Milan (advisor) ; Chotěborský, Rostislav (referee)
This work is dealing with an issue related to recognition and assessment of failures as the causes of car accidents. An analysis of the ability to detect a failure right at the place where a car accident happened has been carried out in this work and possibilities of such a recognition of the failure either by a car driver or by police officers or by expert witness are given here as well. A proper methodological procedure in terms of making an appropriate technical inspection of crashed vehicles has been suggested, incl. verifying the supposed benefits of suggested proceedings through inspections and analyses that have been carried out. This work is also dealing with an influence of time on testimony value of damaged car parts. Various sorts of detected failure confirmation acceptable as a cause of the car accident are discussed in this work as well. The main emphasis is put on the need of securing the damaged car parts right after a car accident happened, top important is keeping these damaged car parts which can ensure their eventual inspection as a source for the correct analysis. There are practical examples of how not taking the damaged car parts can make correct analyses impossible and vice versa how an expection of a damaged car carried out as soon as possible after a car accident can lead the analysis in the right direction.
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Assessment of Factors Influencing Wear Resistance of Metallic Materials
Cieslar, Jiří ; Brožek, Milan (advisor) ; Jan, Jan (referee)
This thesis investigates the suitable chemical composition of a iron alloy with improved wear resistance. A unique set of alloys with a specifically designated chemical composition was manufactured for experiments. Their properties in defined abrasive conditions was studied in laboratory conditions. Wear resistance was determined on an experimental bench with bound particles. Material properties description was always complemented with information gained during material metallographic structure investigations. All the results were compared with results achieved for commercially available weld deposition materials (specifically designated for abrasion conditions). These (weld deposition) materials were subjected to an identical set of laboratory experiments and additionally to a set of experiments under inservice conditions.
This thesis offers new knowledge about the relationship between material hardness, material structure and wear resistance. The outlined results also give evidence about the correlation between results gained under laboratory conditions and those gained under in-service conditions (in relation to material structure and hardness).
At the end of the thesis the knowledge gained from these experiments is applied to a specific application the service life extension of plough blade segments. On this basis a new material is designed which will extend service life without additional demands on the costs, and the approach to the renovation of worn plough blade segments is justified.
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Material utilization of secondary raw materials
Šolar, Matěj ; Valášek, Petr (advisor) ; Brožek, Milan (referee)
Purpose of this Bachelor thesis is to summarize actual information in area of material utilization of secondary raw materials. With focus on waste treatment from metals, plastic and glass. There are summarized technological trends in waste treatment. Also there is briefly introduced issue of waste management in the Czech republic. Material discussed in this work has their short description at the beginning of chapters: Metals, Polymers, Glass. Information about every concrete type of waste mentioned in this work is in subchapters. It is followed by concrete examples of technologies, which are currently considered as attractive. Work is replenished by images which support better understanding and imagination of issues.
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Proposal of parts manufacturing for air industry
Koula, Vojtěch ; Valášek, Petr (advisor) ; Brožek, Milan (referee)
The aim of the thesis is making the design process for the production of parts for the aerospace industry by bending. Forming technology is the perspective of manufacturing technology, what has frequent use in the aerospace industry. Part of this thesis is the experimental finding of maximum possible ram speed on press brake machine during bending of small radius to prevent cracking. Bending was performed on the press brake and possible cracks of the material were check by capillary fluorescence testing. These knowledge were applied in the design process for the manufacturing of parts and there was provided economic evaluation.
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Magnetic separation
Balatý, Tomáš ; Brožek, Milan (advisor) ; Hrabě, Petr (referee)
The aim of the thesis was to gather information about magnetism, magnets and principles used in magnetic separation. The key point of this thesis was to assess the efficacy of an experimental magnetic separation operation. The first chapter is devoted to the introduction, which is a brief description of the problems of magnetic separation. The second chapter describes the current state of the problem, which explains the basic definitions and phenomena arising from the use of permanent magnets or electromagnets. Furthermore, this chapter describes in detail the magnetic separation. The third chapter is devoted to the work goals and methods of processing. The fourth chapter describes an experiment that was conducted to determine the effectiveness of a magnetic separator during the trial operation of transport technology to transport clinker. The last chapter is devoted to conclusions and contribution of this thesis.
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Steel welding
Urbančík, Vojtěch ; Brožek, Milan (advisor) ; Hrabě, Petr (referee)
The topic of this Bachelor thesis focuses on the issue of welding steels. The aim is to provide the reader with basic information about welding. The introductory part gives an overview of welding and description of the basic principle. Some of the methods are described, too. The middle part elaborates on steels and their weldability. The next part of the thesis includes the most widely used methods which are MIG/MAG, WIG, Gas welding and plasma welding. Conclusion gives the overall view for welding and its future prospects.
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Adhesive bonding of metallic and non-metallic materials
Holpuch, Lukáš ; Brožek, Milan (advisor) ; Müller, Miroslav (referee)
The aim of diploma thesis was to collect information of the bonding technology and adhesives available in the local market. Another aim was to assess experimentally the properties of adhesive joints made of metallic and non-mettalic materials which were made by selected adhesives.The whole process is evaluated and complemented by techno-economic evaluation of each adhesive and material.
This thesis is divided into 4 main chapters. The first part describes the bonding technology. Its history, nature, structure, surface preparation prior to bonding, the choice of adhesive and the all important factors which must be taken into account when bonding. The next section includes experimental test of strength for metallic and non-metallic materials. In the following part is a detailed evaluation of the strength of the adhesive used. The conclusion is a complete techno-economic assessment, which is supplemented by tables and graphs.
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