Complex reliability analyses of the bioimplants are very important today, because the failures of them cause traumatic consequences for the patients. We are interested in the calculations of the reliability of the ceramic heads of hip joint endoprosthesis. Reliability of the component made of the brittle material depends on the material parameters and on the tensile stress distribution in the component (bioimplant – hip joint ceramic head). Tensile stresses in the heads are very significantly influenced by the shape deviations of the cone contact areas of the head and the stem. Concerned are shape deviations from the ideal conical surfaces of the stem and the head of the endoprosthesis. The shape deviations may be modeled 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 finite element method – system ANSYS under ISO 7206-5 loading. There are presented and analysed the results of solution of the macro shape deviations and micro shape deviations, obtained from measurements made on the cones of stems and heads. The simulations of the loading of the one head pressed on the 5 different stems cones with macro and micro shape deviations (measured) is solved and analysed.
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- Analyses of the Shape Deviations of the Contact Cones of the Total Hip Joint Endoprostheses
- Springer Berlin Heidelberg