Calculation of the ceramics Weibull parameters

0373509 - ÚT 2012 RIV ID eng J - Journal Article
Fuis, Vladimír - Návrat, Tomáš
Calculation of the ceramics Weibull parameters.
World Academy of Science, Engineering and Technology. Roč. 58, - (2011), s. 642-647. ISSN 2010-376X.
[International Conference on Bioinformatics and Biomedicine 2011. Bali, 26.10.2011-28.10.2011]
Institutional research plan: CEZ:AV0Z20760514
Keywords : biomaterial parameters * Weibull statistics * ceramics
Subject RIV: BO - Biophysics
http://www.waset.org/journals/waset/v58/v58-132.pdf

The standard way of calculation of the ceramic material parameters consists in carrying out a set of 3 or 4 point bending tests of specimens cut out from parts of the ceramic material to be analysed. In case of ceramic heads of hip joint endoprosthesis, it is not possible to cut out specimens of required dimensions because the heads are too small (if the cut out specimens were smaller than the normalised ones, the material parameters derived from them would exhibit higher strength values than those which the given ceramic material really has). On that score, a special testing jig was made, in which 40 heads were destructed. From the measured values of circumferential strains of the head’s external spherical surface under destruction, the state of stress in the head under destruction was established using the final elements method (FEM). From the values obtained, the sought for parameters of the ceramic material were calculated using Weibull’s weakest-link theory.
Permanent Link: http://hdl.handle.net/11104/0206598