A Multi-Station Rolling/Sliding Tribotester for Knee Bearing Materials

[+] Author and Article Information
Douglas W. Van Citters, Francis E. Kennedy, John H. Currier, John P. Collier, Thomas D. Nichols

Thayer School of Engineering, Dartmouth College, Hanover, NH 03755

J. Tribol. 126(2), 380-385 (Apr 19, 2004) (6 pages) doi:10.1115/1.1645536 History: Received March 21, 2003; Revised September 18, 2003; Online April 19, 2004
Copyright © 2004 by ASME
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CAD assembly model of the six-station tribotester design. The adjustable speed drive motor is at the left; it is connected to the upper and lower drive shafts through a crank-rocker mechanism and gearbox. Each of the test stations is loaded by its own pressure-regulated pneumatic cylinder.
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Close-up view of CAD model of one test station. The UHMWPE cylinder is on the upper shaft, with a metallic cylinder on the lower shaft. The contact region is contained in a sealed fluid chamber.
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Photograph of the completed six-station test machine
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Failed UHMWPE cylinder after 387,000 cycles of testing. Subsurface crack is clearly visible.
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Cross-section of UHMWPE cylinder shown in Fig. 4. The arrow points to the crack location, extending to a depth of 1200 μm.
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Failed UHMWPE cylinder for which subsurface crack was allowed to propagate to the surface after 20,000 cycles
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Typical oxidation profile of UHMWPE puck after accelerated aging. The peak oxidation occurs at a depth of 700–900 μm beneath the articular surface.
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Plot of oxidation level (abs/abs) versus number of cycles before onset of subsurface fatigue crack for tests of UHMWPE cylinders run at a normal load of 667 N. Each point is the mean value for tests at each oxidation.
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Plot of Von Mises stress magnitude calculated for all points within UHMWPE cylinder beneath the line contact with a metallic cylinder for a normal load of 667 N. The maximum Von Mises stress is 12 MPa.
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Comparison of stress index (Von Mises stress/ultimate tensile strength) and oxidation index, for UHMWPE cylinder after accelerated aging and in contact with metallic cylinder under a normal load of 667 N




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