High frequency circular translation pin-on-disc wear testing of UHMWPE using a ball-on-flat contact along a hypotrochoidal track |
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| Institution: | 1. Department of Materials Science, Fudan University, Shanghai 200433, PR China;2. Shanghai Nuclear Engineering Research & Design Institute (SNERDI), Shanghai 200233, PR China;3. Shanghai Institute of Process Automation Instrumentation (SIPAI), Shanghai 200233, PR China;1. Dept. Materials Science and Engineering, IQMAAB, Universidad Carlos III de Madrid, Madrid, Spain;2. Dept. Química, Facultad de Ciencias, Universidad de Navarra, 31080, Pamplona, Spain;1. Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada;2. Kennametal Stellite Inc., P.O. Box 5300, Belleville, Ontario K8N 5C4, Canada;1. Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;2. Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic;3. CEITEC-Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, 616 00 Brno, Czech Republic;4. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia |
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| Abstract: | To intensify experimental research within the field of orthopaedic tribology, a three-station, dual motion, high frequency (25.3 Hz) circular translation pin-on-disc wear test device was recently introduced. In the present study, the pins were CoCr with a spherical, polished bearing surface of 28 mm radius, whereas the flat discs were conventional UHMWPE. This configuration was intended to simulate the wear mechanisms of total knee prostheses. The number of wear cycles run was as high as 200 million. The mean wear rate was 0.35 mg per one million cycles (0.77 mg/24 h) which corresponded to a mean wear factor of 3.5 × 10?6 mm3/Nm. The study provided further proof that a wear test for orthopaedic implant materials can be accelerated by substantially increasing the cycle frequency, provided that the sliding velocity remains close to the values obtained from biomechanical studies. Hence, the moderate frictional heating will not lead to unrealistic wear mechanisms. |
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| Keywords: | UHMWPE Accelerated wear testing Biotribology Orthopaedic tribology Prosthetic joints |
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