Engineering Mechanics

Proceedings Vol. 12 (2006)

ENGINEERING MECHANICS 2006

Copyright © 2006 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, Prague

 

V. Fuis, P. Hlavoň, T. Návrat
pages 76 - +8p., full text

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.

Text and facts may be copied and used freely, but credit should be given to these Proceedings.

All papers were reviewed by members of the scientific committee.