Tensile stress analysis of the ceramic head with micro and macro shape deviations of the contact areas

0335146 - ÚT 2010 RIV DE eng C - Conference Paper (international conference)
Fuis, Vladimír
Tensile stress analysis of the ceramic head with micro and macro shape deviations of the contact areas.
[Analýza tahové napjatosti v keramické hlavici s mikro a makro tvarovými odchylkami kontaktních ploch.]
Recent Advances in Mechatronics 2008-2009. Berlin: Springer, 2009 - (Brezina, T.; Jablonski, R.), s. 425-430. ISBN 978-3-642-05021-3.
[Mechatronics 2009. Luhačovice (CZ), 18.11.2009-20.11.2009]
Institutional research plan: CEZ:AV0Z20760514
Keywords : shape deviations * hip joint endoprosthesis * computational modelling
Subject RIV: BO - Biophysics

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 elasto-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. There are analysed three variants of the sizes of the measured micro shape deviations (measured, doubled and halved). The problem of stress in ceramic heads was solved using the finite element method – system ANSYS under ISO 7206-5 loading.

Článek se zabývá problematikou zjištění příčin in vivo destrukci hlavic totální kyčelní endoprotézy. Datailně se zabývá problematikou tahových napětí v keramické hlavicti totální kyčelní endoprotézy pro různé mikro a makro tvarové odchylky kontaktních kuželových ploch.
Permanent Link: http://hdl.handle.net/11104/0179694