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Predicting wear of UHMWPE: decreasing wear rate following a change in direction

Record type: Article

Computational tools are emerging as design tools for the development of total joint replacement with improved wear performance. The current wear models of polyethylene assume that wear is linearly proportional to sliding distance; however, it is hypothesized that the wear rate varies and is higher near a change in direction, but diminishes with continued unidirectional sliding, which eventually exhibits negligible wear. Our goals were to (1) reveal the presence of a variable wear rate in polyethylene; (2) identify the sliding distance required to reestablish unidirectional sliding subsequent to a change in sliding direction. The wear of polyethylene was evaluated in pin-on-disk testing for several different sliding distances (0 mm, 1 mm, 2 mm, 5 mm, 10 mm, and 100 mm) after a 90° change in direction. The results indicate the wear rate immediately following the change in direction is high, but with continued linear sliding the wear rate appears to drop to near zero--returning to the low wearing condition of unidirectional sliding. Furthermore, this transition appears to occur nonlinearly below 5 mm from the change in direction. While more studies are required to explore other paths and uncover the underlying mechanisms, these results should aid the development of computational tools for the design of advanced joint replacement.

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Citation

Dressler, Matthew R., Strickland, Michael A., Taylor, Mark, Render, Todd D. and Ernsberger, Craig N. (2011) Predicting wear of UHMWPE: decreasing wear rate following a change in direction Wear, 271, (11-12), pp. 2879-2883. (doi:10.1016/j.wear.2011.06.006).

More information

e-pub ahead of print date: 12 June 2011
Published date: 2 September 2011
Keywords: bio-tribology, joint prostheses, wear testing, polymers, non-ferrous metals, sliding wear, wear modeling
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 202747
URI: http://eprints.soton.ac.uk/id/eprint/202747
ISSN: 0043-1648
PURE UUID: e3969c2c-f29a-4e3f-aaa8-3a9e5a59632d

Catalogue record

Date deposited: 09 Nov 2011 10:19
Last modified: 18 Jul 2017 11:10

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Contributors

Author: Matthew R. Dressler
Author: Michael A. Strickland
Author: Mark Taylor
Author: Todd D. Render
Author: Craig N. Ernsberger

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