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A coupled contact model of cartilage lubrication in the mixed-mode regime under static compression

机译:静态压缩下混合模式制度的软骨润滑耦合耦合型号

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摘要

This study presents a coupled cartilage contact model, in which the contact gap and cartilage tissue are modelled as two poroelastic systems, linked by pressure and normal flux continuity boundary conditions. Using a tibial plug under indentation as a proof-of-concept model, the predictions support the weeping lubrication theory under static compression. Specifically, the interstitial fluid would exude from the underlying cartilage into the contact gap to extend the mixed-mode duration by > 20-fold compared to a no fluid exudation counterpart. Moreover, the traditional contact model, that does not consider the contact gap and cartilage fluid exchange, potentially overestimates the interstitial fluid pressure compared to the proposed coupled model. Parametric studies suggest that the increasing viscosity of synovial fluid prolongs the gap fluid pressurisation, while increasing the asperity stiffness reduces the gap fluid pressure but increases contact gap height.
机译:本研究介绍了耦合的软骨接触型号,其中接触间隙和软骨组织被建模为两个多孔弹性系统,通过压力和正常的助焊连续性边界条件连接。 在压痕下使用胫骨插头作为概念验证模型,预测支持静态压缩下的垂直润滑理论。 具体地,与NO流体渗出对应物相比,间质液从下面的软骨中偏离接触间隙以使混合模式持续时间延伸> 20倍。 此外,与所提出的耦合模型相比,传统的接触型号,不考虑接触间隙和软骨流体交换,可能会高估间隙流体压力。 参数研究表明,滑膜液的粘度延长了间隙流体冲压,同时增加了粗糙度刚度降低了间隙流体压力,但增加了接触间隙高度。

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