润滑
材料科学
摩擦学
稳态(化学)
复合材料
航程(航空)
边界润滑
全髋关节置换术
冶金
法律工程学
外科
工程类
化学
医学
物理化学
出处
期刊:Tribology series
日期:2003-01-01
卷期号:: 273-280
被引量:17
标识
DOI:10.1016/s0167-8922(03)80139-6
摘要
Metal-on-Metal total replacement hip joints are thought to operate primarily in the boundary, or mixed lubrication regimes, but recent studies [1] have suggested that fluid-film lubrication alleviates the severity of contact and hence wear under some conditions. It is shown that the iso-viscous/elastic mode of fluid-film lubrication applies in such implants. Measurements of steady-state wear rates for different prostheses, in different simulators and under different operating conditions reported from independent tests in laboratories in the U.K., Canada and the U.S.A. are analysed and related to the theoretical elasto-hydrodynamic film thickness. The results exhibit reasonable consistency, even though the test conditions were quite different. A transition from boundary lubrication through mixed lubrication, representing a change in wear rate of some two orders of magnitude, is evident in the wear results as the film thickness increases. At film thicknesses beyond about (15 nm–20 nm) the wear rate varies little as the film thickness increases over a large range. It is shown that very low wear rates of (0.05 mm 3 to 0.10 mm 3 )/10 6 cycles are achievable beyond this film thickness range through careful tribological design. It would take 9–18 years to generate one pin-head of metallic wear under these conditions.
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