Název: Sensitivity Analysis of the Material Parameters Obtained from the Measurements
Autoři: Fuis, Vladimír
Typ dokumentu: Příspěvky z konference
Konference/Akce: International Conference on Mechatronics - Mechatronika (ME) /18./, Brno (CZ), 20181205
Rok: 2018
Jazyk: eng
Abstrakt: The paper deals with sensitivity analysis of the material parameters of the ceramic material on the dispersion of the measured data from the sensors. Material parameters of ceramic material are calculated from a set of destruction tests of ceramic heads of total hip joint replacements. The standard way of calculation of the ceramic material parameters consists in carrying out a set of 3 (or 4) point bending tests of specimens which were cut out from parts of the ceramic material to be analysed. In case of ceramic heads of the prosthesis, it is not possible to cut out specimens of required dimensions because the heads are too small. On that score, a special testing jig was made, in which 40 heads were destructed. From the measured values of circumferential strains of the head’s external spherical surface under destruction (by the sensors – strain gauges), the state of stress in the head under destruction was established using the finite elements method. From the obtained values the material parameters of the ceramic material were calculated using Weibull’s weakest-link theory. The calculated material parameters (Weibull modulus m and normalized volume strength σo, the last material parameter – stress σu is assumed to be equal 0 and corresponds to the conservative approach) has the dispersion and the influence of this dispersion (in our case the dispersion ± 5 % is assumed) is analysed in detail.
Klíčová slova: material parameters; measurement; principal stress; sensitivity analysis; sensor – strain gauge; Weibull's weakest link theory
Zdrojový dokument: PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME), ISBN 978-80-214-5544-3

Instituce: Ústav termomechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0315825

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-432376


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav termomechaniky
Konferenční materiály > Příspěvky z konference