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Use of the DIC method in solving basic problems of solid mechanics
Hrůza, Vlastimil ; Pokorný, Jan (referee) ; Ščerba, Bořek (advisor)
This bachelor’s theses deals with the solution of basic problems of solid mechanics using digital image correlation. The research part of the thesis presents some of the optical methods used for deformation measurement, digital image correlation in particular, whose history, principles, limitations and utilizations are described in detail. In the practical part of the theses, three experiments are carried out, which are then evaluated using digital image correlation and the results are compared with the created computational models. In the first experiment, strain on the tensile test specimens with notches is measured, the second experiment is focused on measuring strain when bending curved beams and in the final experiment, natural frequency of a fork produced by 3D printing is determined.
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Design of actuated measuring setup for vacuum chamber of electron microscope
Imramovský, Jakub ; Náhlík, Luboš (referee) ; Krejsa, Jiří (advisor)
Master's thesis deals with design of an apparatus for straining of CT testing object for research of initiation and propagation of cracks in tested sample, which will be eventually placed in electron microscope vacuum chamber, which belongs to the Institute of Physics of Materials of Czech Academy of Sciences. Principles of strain measurement are described and possible electric motors for actuation of straining apparatus are described. Mapping and creation of a 3D model of vacuum chamber are performed for adjustment of straining device so that the straining process can be actuated. Creation of measuring chain is described as well as creation of graphical user interface. Results and possible further development are discussed in the end of the thesis. Attachment includes 3D model of electron microscope vacuum chamber, code for driving the development board and code for creation of graphical user interface.
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Use of the DIC method in solving basic problems of solid mechanics
Hrůza, Vlastimil ; Pokorný, Jan (referee) ; Ščerba, Bořek (advisor)
This bachelor’s theses deals with the solution of basic problems of solid mechanics using digital image correlation. The research part of the thesis presents some of the optical methods used for deformation measurement, digital image correlation in particular, whose history, principles, limitations and utilizations are described in detail. In the practical part of the theses, three experiments are carried out, which are then evaluated using digital image correlation and the results are compared with the created computational models. In the first experiment, strain on the tensile test specimens with notches is measured, the second experiment is focused on measuring strain when bending curved beams and in the final experiment, natural frequency of a fork produced by 3D printing is determined.
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Improved precision of stereometric measurement of relief's surface by means of structured light enhanced photometric stereo method
Valach, Jaroslav ; Bryscejn, Jan
Photometry is an interesting method for 3D measurement of surfaces with relief. It utilizes a relationship between depth of shadow determined intensity of light and surface normal orientation towards source of light. Advantage of methods incorporating this principle is their independence on distance between measured object and the measuring apparatus and scalable sensitivity suitable for relatively flat surfaces. On the other hand, there is a drawback as the photometric methods yield results up to an unknown multiplicative factor. One way how to overcome this limitation is to simultaneously describe the measured surface by means of another optical method. Among the -candidates-, the structured light projection is the most promising one for a simple implementation. The presentation of the possibility to integrate these two methods in unified system is main topic of this contribution.
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Experimental evaluation of the weibull paramaters of the bioceramics strength
Fuis, Vladimír
The solution to the problem of ceramic head reliability requires realization of two computational models: one for determination of stress states and another one for evaluation of the fracture probability. Material characteristics of ceramics used in fracture probability evaluation have been determined by a 3-point-bending test till now. Within the framework of this paper is that the characteristics will be determined by destruction tests of ceramic heads.
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