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 1.5 cycles/second. 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 fourteen days to account for creep. Differences between initial and final profiles were attributed to wear of the UHMWPE. It was found that the largest wear depth occurred near the ends of the oscillatory contact area, with the most heavily irradiated material showing the least wear. Analysis of the elastohydrodynamic lubrication in the rolling/sliding contact was carried out assuming a line contact situation. 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 (hmin) 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 for wear of the UHMWPE (K) was found to be relatively constant over the central section of the oscillatory motion, but increased to a higher value where hmin decreased to near zero. Thus, the important influence of lubrication on wear of artificial knee bearings was demonstrated.
Skip Nav Destination
STLE/ASME 2006 International Joint Tribology Conference
October 23–25, 2006
San Antonio, Texas, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4259-2
PROCEEDINGS PAPER
Lubrication and Wear of Artificial Knee Joint Materials in a Rolling/Sliding Tribotester Available to Purchase
Francis E. Kennedy,
Francis E. Kennedy
Dartmouth College, Hanover, NH
Search for other works by this author on:
Douglas W. Van Citters,
Douglas W. Van Citters
Dartmouth College, Hanover, NH
Search for other works by this author on:
Khanittha Wongseedakaew,
Khanittha Wongseedakaew
King Mongkut Institute of Technology – Ladkrabang, Bangkok, Thailand
Search for other works by this author on:
Mongkol Mongkolwongrojn
Mongkol Mongkolwongrojn
King Mongkut Institute of Technology – Ladkrabang, Bangkok, Thailand
Search for other works by this author on:
Francis E. Kennedy
Dartmouth College, Hanover, NH
Douglas W. Van Citters
Dartmouth College, Hanover, NH
Khanittha Wongseedakaew
King Mongkut Institute of Technology – Ladkrabang, Bangkok, Thailand
Mongkol Mongkolwongrojn
King Mongkut Institute of Technology – Ladkrabang, Bangkok, Thailand
Paper No:
IJTC2006-12133, pp. 1193-1202; 10 pages
Published Online:
October 2, 2008
Citation
Kennedy, FE, Van Citters, DW, Wongseedakaew, K, & Mongkolwongrojn, M. "Lubrication and Wear of Artificial Knee Joint Materials in a Rolling/Sliding Tribotester." Proceedings of the STLE/ASME 2006 International Joint Tribology Conference. Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology. San Antonio, Texas, USA. October 23–25, 2006. pp. 1193-1202. ASME. https://doi.org/10.1115/IJTC2006-12133
Download citation file:
4
Views
Related Proceedings Papers
Related Articles
Lubrication and Wear of Artificial Knee Joint Materials in a Rolling∕Sliding Tribotester
J. Tribol (April,2007)
Human Joint Simulation Using LifeMOD Co-Simulation
J. Med. Devices (June,2008)
A Mode-Based Elastohydrodynamic Lubrication Model With Elastic Journal and Sleeve
J. Tribol (January,2000)
Related Chapters
Understanding the Problem
Design and Application of the Worm Gear
The Lubricant Film-Forming Properties of Modern Fire Resistant Hydraulic Fluids
Tribology of Hydraulic Pump Testing
Introduction
Report on Available Standard Samples and Related Materials for Spectrochemical Analysis