Abdelgaied, A, Brockett, CL, Liu, F et al. (3 more authors) (2013) Quantification of the effect of cross-shear and applied nominal contact pressure on the wear of moderately cross-linked polyethylene. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 227 (1). 18 - 26. ISSN 0954-4119
Abstract
Polyethylene wear is a great concern in total joint replacement. It is now considered a major limiting factor to the long life of such prostheses. Cross-linking has been introduced to reduce the wear of ultra-high-molecular-weight polyethylene (UHMWPE). Computational models have been used extensively for wear prediction and optimization of artificial knee designs. However, in order to be independent and have general applicability and predictability, computational wear models should be based on inputs from independent experimentally determined wear parameters (wear factors or wear coefficients). The objective of this study was to investigate moderately cross-linked UHMWPE, using a multidirectional pin-on-plate wear test machine, under a wide range of applied nominal contact pressure (from 1 to 11 MPa) and under five different kinematic inputs, varying from a purely linear track to a maximum rotation of ±55°. A computational model, based on a direct simulation of the multidirectional pin-on-plate wear tester, was developed to quantify the degree of cross-shear (CS) of the polyethylene pins articulating against the metallic plates. The moderately cross-linked UHMWPE showed wear factors less than half of that reported in the literature for the conventional UHMWPE, under the same loading and kinematic inputs. In addition, under high applied nominal contact stress, the moderately cross-linked UHMWPE wear showed lower dependence on the degree of CS compared to that under low applied nominal contact stress. The calculated wear coefficients were found to be independent of the applied nominal contact stress, in contrast to the wear factors that were shown to be highly pressure dependent. This study provided independent wear data for inputs into computational models for moderately cross-linked polyethylene and supported the application of wear coefficient–based computational wear models.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) IMechE 2012. This is an open access article under the terms of the Creative Commons Attribution CC BY License |
Keywords: | Moderately cross-linked ultra-high-molecular-weight polyethylene; wear factor; wear coefficient; cross-shear; pin-on-plate experimental wear test |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Medical and Biological Engineering (iMBE) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 14 Aug 2014 11:02 |
Last Modified: | 14 Aug 2014 11:02 |
Published Version: | http://dx.doi.org/10.1177/0954411912459423 |
Status: | Published |
Publisher: | SAGE Publications |
Identification Number: | 10.1177/0954411912459423 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:79911 |