Original title: Sensitivity Analysis of the Material Parameters Obtained from the Measurements
Authors: Fuis, Vladimír
Document type: Papers
Conference/Event: International Conference on Mechatronics - Mechatronika (ME) /18./, Brno (CZ), 20181205
Year: 2018
Language: eng
Abstract: 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.
Keywords: material parameters; measurement; principal stress; sensitivity analysis; sensor – strain gauge; Weibull's weakest link theory
Host item entry: PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME), ISBN 978-80-214-5544-3

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0315825

Permalink: http://www.nusl.cz/ntk/nusl-432376


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
 Record created 2021-02-24, last modified 2023-12-06


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