Contact stresses in PCD-on-PCD hip joint prostheses
Date
2011
Authors
Uddin, M.S.
Zhang, L.
Editors
Haddad, H.
YM, Y.M.
YM, Y.M.
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Conference paper
Citation
Proceedings of AES-ATEMA’ 2011 International Conference on Advances and Trends in Engineering Materials and their Applications, 2011 / Haddad, H., YM, Y.M. (ed./s), pp.139-147
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7th International Conference on Advances and Trends in Engineering Materials and their Applications (4 Jul 2011 - 8 Jul 2011 : Milan, Italy)
Abstract
This paper presents a contact mechanics analysis of a PCD femoral head against a PCD acetabular cup used in hip joint prostheses. The effects of the key design parameters, such as femoral head size, radial clearance and cup thickness on the contact pressure and stresses in bearing components were investigated with the aid of the finite element (FE) method. The results obtained from the FE analysis showed that a larger PCD femoral head gives a smaller contact stress on the bearing surface, and that a lower radial clearance and a smaller cup-shell thickness ratio reduce the maximum contact pressure. However, a smaller cup/shell thickness ratio brings about an increase of the maximum von Mises stress and maximum tensile stress in the PCD cup, suggesting that a cup thickness must be selected based on a sophisticated consideration of the contact stresses. It was also found that the bonding conditions at the interface between the PCD cup and Co-Cr-Mo metallic shell has a negligible effect on the contact stress distribution and the maximum tensile stress.
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Copyright 2011 Advanced Engineering Solutions