Elastohydrodynamic lubrication analysis of polymer-on-polymer artificial hip joint of CF/PEEK composite

摘要

At present, the main frictional components of artificial hip joint (AHJ) are mainly the combinations of hard materials (metal, ceramic) and soft materials (polymer), such as, metal-on-metal (MoM), ceramic-on-ceramic (CoC), metal-on-polymer (MoP), and ceramic-on-polymer (CoP). As a new type of AHJ, the polymer-on-polymer (PoP) combination has gradually begun to be explored and studied. In this paper, PoP AHJ of CF/PEEK composite are studied, and elastohydrodynamic lubrication analysis based on the solution of the Reynolds equation is performed, and the results are compared with the MoM and MoP AHJs. The comparison shows that under the same steady-state condition, the PoP AHJ has better lubrication performance. The influence of the key structural parameters of the CF/PEEK PoP AHJ is also analyzed in this paper, and the results show that the femoral head size and radial clearance have great influence on the thickness and pressure distribution of the lubricating film. The research results in this paper further confirm the application potential of the PoP AHJ, and are helpful to its practical application and structural design.