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Influence of input material on technology and production of deep drawn product
Černá, Monika ; Peterková, Eva (referee) ; Šulák, Ivo (advisor)
This bachelor thesis was elaborated in cooperation with company ITW Pronovia, s.r.o within the scope of the bachelor degree and presents an assessment of the effect of material properties and manufacturing technology of a deep-drawn product. In this work the mechanical and technological tests were carried out on the supplied material HT179. This material is further processed into a cartridge for an airbag deployment. During production many defects occurred, especially after cutting out the holes of deep-drawn product. The company established these defects as material property. Therefore it is necessary to evaluate the characteristics of different material sets.
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Fiber reinforcements for polymer composites
Knob, Antonín ; Grégr, Jan (referee) ; Čech, Vladimír (advisor)
The bachelor thesis is concerned with an influence of surface modification of fibrous reinforcements on mechanical properties at the fiber-matrix interface in fiber-reinforced polymer composites. Polyester resin was used as a matrix, glass and carbon fibers were the reinforcements. The composite sample consisted of polymer matrix in a form of cylindrical body placed on a bundle of fibers. Untreated fibers and fibers with a commercial sizing were used for fabrication of composite samples. The tensile test using a materials testing machine (Zwick) was employed to evaluate adhesion at the fiber-matrix interface.
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Optimalization of Temperature for Semi-hot Forming of Roll Bearings
Hrouzková, Andrea ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
This bachelor's thesis solve the problems about optimalization of temperature for semi-hot forming of roll bearings steels. The purpose of this thesis is finding the optimal interval of temperatures, in which 100CrMnSi6-4 bearing steel shows good strain and deformation characteristics after forming. Methods for data evaluation of mechanical properties are the tensile and upsetting tests which were performed on higher temperatures. It was microscoped microstructure changes of the bearing steel 100CrMnSi6-4 during temperature influence and classification with the light microscope.
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Preparation of glass fiber/polyester composites
Horská, Pavlína ; Richtera, Lukáš (referee) ; Čech, Vladimír (advisor)
The bachelor thesis is aimed at an influence of surface modifications of fibrous reinforcements on mechanical properties at the fiber-matrix interface in fiber reinforced composites. Glass fibers were used as reinforcements and polyester resin was the matrix. The sample of composite consisted of polymer matrix in a form of cylindrical body placed on a bundle of glass fibers. The tensile test using a materials testing machine (Zwick) was employed to evaluate adhesion at the fiber-matrix interface. Untreated glass fibers and fibers with commercial sizing were used for fabrication of composite samples.
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Numerický model odezvy stromu během tahové zkoušky
Vojáčková, Barbota
The numerical simulation of the tree pulling test was carried out in the thesis. ANSYS Parametric Design Language was used for the simulation. The parametric design enables use of simulation for variations of tree dimensions, material properties and device positions. Results from numerical solution were compared with a field experiment and analytical solution in cases of three oaks. To found significant influence of input parameters probabilistic analysis was carried out. The analysis found that there is a significant correlation among stem diameter, root volume and tree inclination and nodes displacement on the tree stem. The influence of stem defect and root-plate damage on ability of devices was found as well. Numerical model can be used for the simulation of tree pulling test in wide variety of different configurations, for example change of geometry, material properties and defects extension and position of stem and root-plate system. The practical impact of results and further development of numerical simulation are discussed at the end.
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Kvalita svarových spojů
Pénz, Attila
The thesis may be divided into two parts, the theoretical and practical part. In the theoretical part of my thesis describe the permanent connection in engineering includes soldering, gluing, riveting and welding and further describe the building-up and weldability tests as part of the technological tests. In the practical part of my thesis describe what and how I was doing. How I progressed in the production of individual samples and testing. We can find there a description of the tensile test, graphical display each tensile test, measured and calculated values and evaluation of tests. Further describe the detection of microstructure and microhardness. Each photo of microstructure I worked to the table and commented what can we see on them. At microhardness we can read about the gist and execution of the test. Obtained values I compiled to the chart and commented. According to the hardness can recognize a structural component and phases. In conclusion is a summary of the measured values and evaluation.
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Simulation of load tensile tests tractors.
HOLÝ, Miroslav
Work is dealing with issues of tensile testing of tractors and their methods. Teoretic part is consists of today's methods of service tensile testing overview and problems of tractors movements during driving on a contour. Practical part is dealing with proposal of mechanism for weight simulation, based on stopping winch and review of appropriateness this method.
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Simulation of tensile load testing tractors.
KAHOUN, Petr
The paper deals with tensile testing of tractors and their methods. The theoretical part contains an overview of current methods of performing tensile tests, heorists transfer power to the caster and the issue of movement of the tractor whiledriving on sloping land. The practical part deals with design of equipment to simulate load based on a brakedwinch and the evaluation of this method.
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