Publication detail
Stress analysis of the hip joint endoprosthesis with shape deflections
FUIS, V. NÁVRAT, T.
Czech title
Napjatostní analýza kyčelní endoprotézy s tvarovými odchylkami
English title
Stress analysis of the hip joint endoprosthesis with shape deflections
Type
journal article - other
Language
en
Original abstract
The paper deals with the problems of ceramic head of hip joint endoprosthesis destructions, and with assessing the impact of shape deflections of conical surfaces on the probability of this failure. Concerned are shape deflections from the ideal conical surfaces of the stem and the head of the endoprosthesis, which – when the head is put on the stem and the endoprosthesis loaded – form a contact configuration. The shape deflections may be modelled at the macro-level – this concerns model shape inaccuracies such as deflection from the nominal degree of taper, ovality, and their combination, or, possibly, 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 for spatial contact tasks, and the Weibull probability model was used for solving the problem of head cohesion failure probability. In the paper are presented and analysed the results of solution of the micro-level shape deflections, obtained from measurements made on the cones of stems and heads.
Czech abstract
Příspěvek se zabývá napjatostní analýzovou keramické hlavice kyčelní endoprotézy s uvažovanýmí tvarovými odchylkami na kontaktním kuželovém spojení hlavice-dřík.
English abstract
The paper deals with the problems of ceramic head of hip joint endoprosthesis destructions, and with assessing the impact of shape deflections of conical surfaces on the probability of this failure. Concerned are shape deflections from the ideal conical surfaces of the stem and the head of the endoprosthesis, which – when the head is put on the stem and the endoprosthesis loaded – form a contact configuration. The shape deflections may be modelled at the macro-level – this concerns model shape inaccuracies such as deflection from the nominal degree of taper, ovality, and their combination, or, possibly, 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 for spatial contact tasks, and the Weibull probability model was used for solving the problem of head cohesion failure probability. In the paper are presented and analysed the results of solution of the micro-level shape deflections, obtained from measurements made on the cones of stems and heads.
Keywords in English
Computational modelling, hip joint endoprosthesis, micro-unevenness modelling, stress and failure probability analyses, Weibull weakest link theory
RIV year
2005
Released
20.09.2005
Publisher
Engineering Academy of the Czech Republic
Location
Brno
ISSN
1210-2717
Book
Engineering Mechanics
Journal
Inženýrská mechanika - Engineering Mechanics
Volume
12
Number
5
Pages count
7
BIBTEX
@article{BUT46124,
author="Vladimír {Fuis} and Tomáš {Návrat},
title="Stress analysis of the hip joint endoprosthesis with shape deflections",
journal="Inženýrská mechanika - Engineering Mechanics",
booktitle="Engineering Mechanics",
year="2005",
volume="12",
number="5",
month="September",
publisher="Engineering Academy of the Czech Republic",
address="Brno",
issn="1210-2717"
}