This paper describes the influence of lubrication on wear during testing of materials for artificial knee joints in a rolling∕sliding tribotester built to simulate contact conditions in a total knee replacement. The test configuration consists of parallel cylinders (pucks) of ultrahigh molecular weight polyethylene (UHMWPE) and polished cobalt-chrome alloy in oscillatory rolling∕sliding contact in a bath of dilute (25%) bovine serum. Wear tests of three different UHMWPE materials were run under constant load at 40% sliding for 1.5 million oscillation cycles at . Wear of the UHMWPE was determined by measuring the profile of the cylindrical contact surface of the puck before and after each test. Profile measurements were repeated after at least to eliminate the contribution from creep. Differences between initial and final profiles were attributed to wear of the UHMWPE. It was found that the largest wear depth in the lubricated tests occurred near the ends of the oscillatory contact area, while dry (unlubricated) tests of the same materials showed a peak wear depth near the center of the contact area. In the lubricated tests, the worn depth was lowest for the most heavily irradiated material. Analysis of the elastohydrodynamic lubrication in the rolling∕sliding contact was carried out assuming a line-contact situation with smooth cylindrical surfaces. The time-dependent modified Reynolds equation and the elasticity equation with initial conditions were solved numerically using a multigrid technique with full approximation scheme, and using a Newton Raphson method to solve the highly nonlinear system of equations. The thickness of the lubricating film of bovine serum was determined for points along the length of the wear track. It was found that the smallest film thickness occurs very close to the location in the oscillating contact where the greatest wear occurs, owing to the very low entraining velocity near the ends of the oscillation cycle. The coefficient (K) for wear of the UHMWPE was found to be relatively constant over the central section of the oscillatory motion, but increased to a higher value where decreased to near zero. Thus, the important influence of lubrication on wear of artificial knee bearings was demonstrated.
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April 2007
Technical Papers
Lubrication and Wear of Artificial Knee Joint Materials in a Rolling∕Sliding Tribotester
Francis E. Kennedy,
Francis E. Kennedy
Thayer School of Engineering,
Dartmouth College
, Hanover, NH 03755
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Douglas W. Van Citters,
Douglas W. Van Citters
Thayer School of Engineering,
Dartmouth College
, Hanover, NH 03755
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Khanittha Wongseedakaew,
Khanittha Wongseedakaew
Department of Mechanical Engineering, ReCCIT, Faculty of Engineering,
King Mongkut’s Institute of Technology Ladkrabang
, Bangkok, Thailand
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Mongkol Mongkolwongrojn
Mongkol Mongkolwongrojn
Department of Mechanical Engineering, ReCCIT, Faculty of Engineering,
King Mongkut’s Institute of Technology Ladkrabang
, Bangkok, Thailand
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Francis E. Kennedy
Thayer School of Engineering,
Dartmouth College
, Hanover, NH 03755
Douglas W. Van Citters
Thayer School of Engineering,
Dartmouth College
, Hanover, NH 03755
Khanittha Wongseedakaew
Department of Mechanical Engineering, ReCCIT, Faculty of Engineering,
King Mongkut’s Institute of Technology Ladkrabang
, Bangkok, Thailand
Mongkol Mongkolwongrojn
Department of Mechanical Engineering, ReCCIT, Faculty of Engineering,
King Mongkut’s Institute of Technology Ladkrabang
, Bangkok, ThailandJ. Tribol. Apr 2007, 129(2): 326-335 (10 pages)
Published Online: November 14, 2006
Article history
Received:
March 25, 2006
Revised:
November 14, 2006
Citation
Kennedy, F. E., Van Citters, D. W., Wongseedakaew, K., and Mongkolwongrojn, M. (November 14, 2006). "Lubrication and Wear of Artificial Knee Joint Materials in a Rolling∕Sliding Tribotester." ASME. J. Tribol. April 2007; 129(2): 326–335. https://doi.org/10.1115/1.2464130
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