Publication detail

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

FUIS, V. HLAVOŇ, P.

Original Title

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

English Title

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

Type

conference paper

Language

en

Original Abstract

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. In the paper are presented and analysed the results of solution of the macro-level shape deviations and micro-level shape deviations, obtained from measurements made on the cones of stems and heads.

English abstract

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. In the paper are presented and analysed the results of solution of the macro-level shape deviations and micro-level shape deviations, obtained from measurements made on the cones of stems and heads.

Keywords

Biomechanics, hip joint endorporsthesis, shape deviations

RIV year

2008

Released

29.09.2008

Location

Praha

ISBN

978-80-01-04163-5

Book

Human biomechanics 2008

Pages from

1

Pages to

2

Pages count

2

Documents

BibTex


@inproceedings{BUT30124,
  author="Vladimír {Fuis} and Pavel {Hlavoň}",
  title="Stress Analysis of the Ceramics Head with Micro and Macro Shape Deviations of the Contact Areas",
  annote="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. In the paper are presented and analysed the results of solution of the macro-level shape deviations and micro-level shape deviations, obtained from measurements made on the cones of stems and heads.",
  booktitle="Human biomechanics 2008",
  chapter="30124",
  howpublished="print",
  year="2008",
  month="september",
  pages="1--2",
  type="conference paper"
}