演讲人： Leiming Gao，英国帝国理工大学
报告题目：What role does the lubrication play on the wear of hip joint replacements?
报告摘要：
Abstract
Wear is known to be one of the major causes of failure of an artificial joint replacement, and lubrication plays a key role in the determination of the level of wear in these joint bearings. It has been known that artificial hip joints operate in both the full fluid film regime, specifically the elastohydrodynamic lubrication (EHL) regime, and the mixed or boundary lubrication regimes, where contact between the bearing surfaces results in wear. The mixed lubrication regime adds complexity to the prediction of wear.
In this talk a wear model is presented which considers lubrication via a transient EHL model of metal-on-metal hip replacements. This is a framework to investigate how the change in film thickness influences the wear, which is important to further investigation of the complex wear procedure in the joint replacements.
The wear model applied here is based on the adapted Archard wear law by making the wear rate a function of a relative film thickness nominalized by surface roughness. The gait cycle employed in hip simulator tests is computationally investigated and wear is predicted for metal-on-metal total hip replacements. The wear results qualitatively predict the typical wear curve obtained from experimental hip simulator tests, with an initial ‘running-in period’ before a lower wear rate is reached.
演讲人介绍Biography
Dr Leiming Gao obtained a Bachelor degree in Mechanical Engineering at Qingdao Technological University (China) in 2001, and a Master degree in Tribology at the same university in 2004.
She then came to the UK for a PhD study at the University of Leeds and obtained a PhD degree in Biotribology in 2009, entitled “Mixed elastohydrodynamic lubrication (EHL) in metal-on-metal hip joints under transient loading and motion conditions”.
She did four years postdoctoral research work focusing on EHL modelling and wear modelling of both industrial bearings and hip joint replacements at the University of Leeds (UK) and Imperial College London, involved in both UK and European projects ( EPSRC, Leverhulme Trust, and EU 7th Framework Programme).
She is currently a Junior Research Fellow in the Aeronautics Department at Imperial College London working on the design of low wear hip and knee joint replacements.
