Publication detail
CALCULATION OF THE CERAMICS MATERIAL PARAMETERS FROM THE TESTING DESTRUCTIONS OF THE HEADS
FUIS, V. HLAVOŇ, P. NÁVRAT, T.
Czech title
Určení parametrů keramického materiálu z destrukcí keramických hlavic
English title
CALCULATION OF THE CERAMICS MATERIAL PARAMETERS FROM THE TESTING DESTRUCTIONS OF THE HEADS
Type
conference paper
Language
en
Original abstract
This paper deals with increasing of the computation modelling level of the reliability problem of ceramic heads of total hip joint endoprostheses. The solution to this problem was invoked by recent more frequent failures of these heads in clinical practice. Results of computational and experimental modelling have shown a substantial influence of shape deviations in the conical connection between stem and head on the initiation of ceramic head fractures. The fracture probability was evaluated step by step for various macroscopic shape deviations in the conical connection and then for microscopic shape deviations superposed on the macroscopic deviations. The solution to the problem of ceramic head reliability requires realization of two computational models: one for determination of stress states and another one for evaluation of the fracture probability. Material characteristics of ceramics used in fracture probability evaluation have been determined by a three-point-bending test till now. Within the framework of this paper is that the characteristics will be determined by destruction tests of ceramic heads and they will be used as new input data in the computational variants realized till now.
Czech abstract
Příspěvek se zabývá problematikou zvýšení úrovně výpočtového modelování pravděpodobnosti porušení keramických hlavic totálních kyčelních endoprotéz. Zvýšení úrovně spočívá v určení materiálových parametrů keramického materiálu přímno z destrukcí keramických hlavic.
English abstract
This paper deals with increasing of the computation modelling level of the reliability problem of ceramic heads of total hip joint endoprostheses. The solution to this problem was invoked by recent more frequent failures of these heads in clinical practice. Results of computational and experimental modelling have shown a substantial influence of shape deviations in the conical connection between stem and head on the initiation of ceramic head fractures. The fracture probability was evaluated step by step for various macroscopic shape deviations in the conical connection and then for microscopic shape deviations superposed on the macroscopic deviations. The solution to the problem of ceramic head reliability requires realization of two computational models: one for determination of stress states and another one for evaluation of the fracture probability. Material characteristics of ceramics used in fracture probability evaluation have been determined by a three-point-bending test till now. Within the framework of this paper is that the characteristics will be determined by destruction tests of ceramic heads and they will be used as new input data in the computational variants realized till now.
Keywords in English
Weibul weakest-link theory, material parameters, ceramics, FEM analysis
RIV year
2006
Released
15.05.2006
Publisher
ÚTAM AV ČR
Location
Svratka
ISBN
80-86246-27-2
Book
Engineering Mechanics 2006
Pages count
2
BIBTEX
@inproceedings{BUT19529,
author="Vladimír {Fuis} and Pavel {Hlavoň} and Tomáš {Návrat},
title="CALCULATION OF THE CERAMICS MATERIAL PARAMETERS FROM THE TESTING DESTRUCTIONS OF THE HEADS",
booktitle="Engineering Mechanics 2006",
year="2006",
month="May",
publisher="ÚTAM AV ČR",
address="Svratka",
isbn="80-86246-27-2"
}