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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Standards for measuring plane angle and shape deviations on CMM
 Lipták, Matúš ; Jankových, Róbert (referee) ; Šrámek, Jan (advisor)
The presented diploma thesis deals with the issue of selecting suitable standards for measurement of plane angle and shape deviations on coordinate measuring machines. As for the shape deviations, the characteristics of straightness and roundness have been processed in this thesis. The selected standards are then used to calibrate chosen CMMs, including the optical CMM SOL 311 and the articulated arm AACMM Hexagon Absolute Arm 83 Compact. The thesis also includes general theoretical knowledge in the field of metrology and the current state of measurement using CMMs. The experimental part is focused on carrying out the measurements during CMM calibration, followed by the identification and quantification of individual uncertainty components. Finally, the obtained results of the measured geometrical characteristics on individual CMMs are evaluated and compared with each other.
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Napjatostní analýza keramické hlavice totální kyčelní endorpotézy s mikro a makro tvaovými odchylkami
 Fuis, Vladimír ; Hlavoň, Pavel
The paper deals with the problems of ceramic head of hip joint endoprosthesis destructions in vivo, and with assessing the impact of shape deflections of conical surfaces on the tensile stress in the head. There are assumed two material characteristics of the stem – the first is linear elastic and the second is bilinear plastic modelled austenitic steel used in the bio-implants. Concerned are shape deviations from the ideal conical surfaces of the stem and the head of the endoprosthesis. The shape deviations may be modelled at the macro-level - this concerns model shape inaccuracies such as deviation from the nominal degree of taper, at the micro-level - when the stochastic distribution of unevenness on the contact areas is respected. The problem of stress in ceramic heads was solved using the algorithm of the finite element method – system ANSYS under ISO 7206-5 loading.
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