Dynamic Modeling and Analysis of Wear in Artificial Hip Articulations

E. Askari ； P. Flores ； D. Dabirrahmani ； R. Appleyard

《Proceedings of the 14th IFToMM World Congress》 14th-2 (2015/10) Pp. 549-553

https://doi.org/10.6567/IFToMM.14TH.WC.OS11.007

並列摘要

The main objective of the present study was to investigate the effect of friction-induced vibration on the predicted wear of artificial hip joints. The problem was formulated by developing a spatial multibody dynamic model of a hip prosthesis taking three-dimensional physiological loading and motion of the human body into account. The vibration of the femoral head inside the cup due to negative damping effect, stick-slip and alteration in contact force were incorporated in the system analysis. Previous investigation demonstrated that friction-induced vibration could increase the sliding distance of the contact point between the head and cup by altering its macro and micro trajectory. This work deals with the integration of the Archard wear model into the dynamic evaluation of the hip implant to predict wear. Additionally, to generate a more realistic wear simulation, geometries of the cup and head were updated throughout the simulation. It was hypothesized that friction-induced vibration can be the cause of the high wear rates observed clinically and finally illustrated that this undesirable oscillation caused excessive wear of hip implant component.

並列關鍵字

Hip articulation ； Wear ； Multibody dynamics