The paper deals with calculation of the parameters of
ceramic material from a set of destruction tests of ceramic heads of
total hip joint endoprosthesis. The standard way of calculation of the
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, 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.
[1] D. Bush, "Designing Ceramic Components for Structural Applications"
J. Mater. Eng. Perf. ASM Int., vol. 2, 1993, pp. 851-862.
[2] A. F. McLean, D. L. Hartsock, "Engineered materials handbook" vol. 4,
Ceramics and Glasses. ASM International 1991, pp. 676-689.
[3] V. Fuis, P. Janicek,"Stress and reliability analyses of damaged ceramic
femoral heads" Damage & Fracture Mechanics VII. WIT Press, 2002,
pp. 475-486.
[4] P. Janicek, V. Fuis, M. Malek, "Computational modeling of the
probability of destructions in total joint endoprosthesis ceramic heads
using Weibull's theory". Acta Mechanica Slovaca, vol. 14, No. 4, 2010,
pp. 41-52.
[1] D. Bush, "Designing Ceramic Components for Structural Applications"
J. Mater. Eng. Perf. ASM Int., vol. 2, 1993, pp. 851-862.
[2] A. F. McLean, D. L. Hartsock, "Engineered materials handbook" vol. 4,
Ceramics and Glasses. ASM International 1991, pp. 676-689.
[3] V. Fuis, P. Janicek,"Stress and reliability analyses of damaged ceramic
femoral heads" Damage & Fracture Mechanics VII. WIT Press, 2002,
pp. 475-486.
[4] P. Janicek, V. Fuis, M. Malek, "Computational modeling of the
probability of destructions in total joint endoprosthesis ceramic heads
using Weibull's theory". Acta Mechanica Slovaca, vol. 14, No. 4, 2010,
pp. 41-52.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:58835", author = "V. Fuis and T. Navrat", title = "Calculation of the Ceramics Weibull Parameters", abstract = "The paper deals with calculation of the parameters of
ceramic material from a set of destruction tests of ceramic heads of
total hip joint endoprosthesis. The standard way of calculation of the
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, 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.", keywords = "Hip joint endoprosthesis, ceramic head, FEM
analysis, Weibull's weakest-link theory, failure probability, material
parameters", volume = "5", number = "10", pages = "2020-6", }