Vassilou, K. and Elfick, A. P. D. and Scholes, S. C. and Unsworth, A. (2006) 'The effect of 'running-in' on the tribology and surface morphology of metal-on-metal Birmingham hip resurfacing device in simulator studies.', Proceedings of the I MECH E part H : journal of engineering in medicine., 220 (2). 269 - 277.
It is well documented that hard bearing combinations show a running-in phenomenon in vitro and there is also some evidence of this from retrieval studies. In order to investigate this phenomenon, five Birmingham hip resurfacing devices were tested in a hip wear simulator. One of these (joint 1) was also tested in a friction simulator before, during, and after the wear test and surface analysis was conducted throughout portions of the testing. The wear showed the classical running in with the wear rate falling from 1.84 mm 3 per 10 6 cycles for the first 10 6 cycles of testing to 0.24 mm 3 per 10 6 cycles over the final 2 x 10 6 cycles of testing. The friction tests suggested boundary lubrication initially, but at 1 x 10 6 cycles a mixed lubrication regime was evident. By 2 x 10 6 cycles the classical Stribeck curve had formed, indicating a considerable contribution from the fluid film at higher viscosities. This continued to be evident at both 3 x 10 6 and 5 x 10 6 cycles. The surface study complements these findings.
|Keywords:||Metal-on-metal resurfacing, Wear, Running in, Lubrication, Simulator study.|
|Full text:||PDF - Published Version (314Kb)|
|Publisher Web site:||http://dx.doi.org/10.1243/09544119JEIM63|
|Publisher statement:||© Vassilou, K. and Elfick, A. P. D. and Scholes, S. C. and Unsworth, A., 2006. The definitive, peer reviewed and edited version of this article is published in Proceedings of the I MECH E part H : journal of engineering in medicine, 220, 2, pp. 269 - 277, 10.1243/09544119JEIM63|
|Record Created:||12 Mar 2007|
|Last Modified:||31 May 2011 16:28|
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