波纹刚性压头与弹性压头间润滑油池的动水加压:表面粗糙度对软骨润滑作用的研究

Ines M. Basalo, G. Ateshian
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引用次数: 0

摘要

在最近关于关节腹泻关节润滑的研究中,有人提出关节加载时软骨间隙液的静水加压有助于关节层间的负载支撑,从而减少摩擦力和磨损[1-3]。这种多孔介质的边界接触机制可以解释观察到的摩擦系数随时间变化的响应。然而,也有人提出了其他假设,将低摩擦系数归因于流体动力润滑bb0。在我们最近对一个混合润滑问题的分析中,润滑油池被困在波纹刚性压头和双相软骨层[5]之间,我们观察到,被困润滑剂的静水加压可以在一定程度上增强流体负载支撑,但通常只持续很短的时间,大约只有1秒,直到润滑剂流入软骨层而耗尽。此外,在稳态滑动情况下,由于润滑油耗尽,润滑油池无法维持。这些分析采用了润滑剂的无粘模型,因为它们只关注流体静压。在本研究中,我们将探讨润滑油粘度是否能够促进流体动力增压,从而进一步增强流体负载支撑机制或改变我们早期研究的结论。为了研究这些基本机制,首先使用弹性层代替双相层;如果目前的研究结果得到证实,随后可以采用更详细的双相分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrodynamic Pressurization of a Trapped Lubricant Pool Between a Rippled Rigid Indenter and an Elastic Layer: An Investigation Into the Role of Surface Roughness on Cartilage Lubrication
In recent studies of articular diarthrodial joint lubrication, it has been proposed that hydrostatic pressurization of the cartilage interstitial fluid upon joint loading contributes significantly to the load support across the articular layers, thus reducing frictional forces and wear [1–3]. This boundary contact mechanism for porous media can explain the observed time-dependent response of the frictional coefficient. Nevertheless, alternative hypotheses have been also proposed which attribute the low friction coefficient to hydrodynamic lubrication [4]. In our recent analysis of a mixed lubrication problem where a lubricant pool is trapped between a rippled rigid indenter and a biphasic cartilage layer [5], it was observed that the hydrostatic pressurization of the trapped lubricant can enhance the fluid load support to a certain extent, but typically for a short duration on the order of 1 s only, until the lubricant is depleted by flowing into the cartilage layer. Furthermore, under steady-state sliding, it was found that a lubricant pool could not be sustained due to lubricant depletion. These analyses employed an inviscid model for the lubricant as they focused on hydrostatic pressurization only. In the current study, we investigate whether lubricant viscosity, which can promote hydrodynamic pressurization, might further enhance the fluid load support mechanism or alter the conclusions gathered from our earlier studies. To investigate these fundamental mechanisms, an elastic layer is used instead of a biphasic layer at first; a more elaborate biphasic analysis could be employed subsequently if warranted by the current findings.
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