Stress Analysis of the Ceramics Head with Micro and Macro Shape Deviations of the Contact Areas

0314962 - ÚT 2009 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Fuis, Vladimír - Hlavoň, Pavel
Stress Analysis of the Ceramics Head with Micro and Macro Shape Deviations of the Contact Areas.
[Napjatostní analýza keramické hlavice totální kyčelní endorpotézy s mikro a makro tvaovými odchylkami.]
Human Biomechanics 2008. Prague: Czech Society of Biomechanics Charles Univerzity in Prague, 2008, s. 1-2. ISBN 978-80-01-04163-5.
[Human Biomechanics 2008. Praha (CZ), 29.09.2008-01.10.2008]
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: hip joint endoprosthesis * shape deviations
Kód oboru RIV: BO - Biofyzika

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.

Příspěvek se zabývá vlivem materiálu dříku na napjatost v hlavici totální kyčelní endoprotézy s mikro a makro tvarovými odchylkami.
Trvalý link: http://hdl.handle.net/11104/0165317