Paper Title:
Influence of the Ball Diameter, Material and Taper Design on Transferred Stresses of Ceramic THR
  Abstract

The brittleness of ceramics has been their weak spot when considering them for total hip replacements. There are several situations from which concentrated stresses can develop and induce failure of the components. It is not a problem of the material’s properties in particular but also its design. This means that even proof tested-third generation-ISO obeying ceramics may fail if the incidence of the design parameters on them is not carefully evaluated. In this paper, the finite element analysis technique is used to show how the change of ball diameter can affect the Vonmises stress on the ball head component when it is subjected to a high (trauma-like) load. The analysis is nonlinear and was carefully tested for convergence. 3D models of four different ball head diameters where constructed, two designs of the bore/cone interface with two sets of material properties (Alumina and Zirconia) were considered. The results from these analyses are given in the form of stress maps on the ball heads; such data may be useful for surgeons, patients, and designers because it shows a direct relationship between two important parameters on ball head design (diameter and bore) and material properties, on the stresses that can cause failure of the component when they are concentrated in small elements of volume.

  Info
Periodical
Materials Science Forum (Volumes 544-545)
Edited by
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
Pages
375-378
DOI
10.4028/www.scientific.net/MSF.544-545.375
Citation
S. W. Lee, D. G. Carrillo, D.K. Kang, J. Lira-Olivares, "Influence of the Ball Diameter, Material and Taper Design on Transferred Stresses of Ceramic THR", Materials Science Forum, Vols. 544-545, pp. 375-378, 2007
Online since
May 2007
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$32.00
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