A steady-state elastohydrodynamic lubrication model aimed at natural hip joints with physiological loading and anatomical position

作者：Quinonez A Felix^*; Fisher J; Jin Z M

来源：Proceedings of the Institution of Mechanical Engineers - Part J: Journal of Engineering Tribology , 2008, 222(J3): 503-512.

DOI：10.1243/13506501JET332

• elastohydrodynamic lubrication
• natural hip joint
• spherical bearing
• soft elastohydrodynamic lubrication

A steady-state elastohydrodynamic lubrication model has been implemented with a view on simulating the operating conditions of natural hip joints. The model predictions were compared by employing two methods of estimating the elastic deformation of a soft-layered ball-in-cup geometrical configuration, namely (a) a simple constrained column model and (b) a full-field solution approach with displacement coefficients obtained from a prior finite-element method analysis. The comparison aimed to investigate the suitability of the former method, which is easier to implement and use in terms of both time and effort. For the range of operating conditions considered, the results obtained suggest that the constrained column method can be incorporated into the lubrication model in cases where the soft-layered bearing surface has a Poisson's ratio not greater than 0.45. Otherwise excessively large contact pressures are obtained. In addition to these results, good agreement was also found between the absolute values of film thickness calculated here and those predicted using suitable formulae available in the literature.

• 出版日期2008-5
• 单位河北医科大学