Transient mixed lubrication model of the human knee implant
作者机构：Department of AeronauticsImperial College LondonLondonUK Department of Mechanical EngineeringUniversity of BathBathUK Department of EngineeringNottingham Trent UniversityNottinghamUK Dyson School of Design EngineeringImperial College LondonLondonUK School of Mechanical EngineeringUniversity of LeedsLeedsUK
出 版 物：《Biosurface and Biotribology》 (生物表面与生物摩擦学（英文）)
年 卷 期：2021年第7卷第4期
页 面：206-218页
核心收录：
学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0836[工学-生物工程] 0801[工学-力学（可授工学、理学学位）]
基 金：Imperial College Research Fellowship Engineering and Physical Sciences Research Council,Grant/Award Number:EP/N509486/1。
主 题：complex geometry knee implant mixed lubrication modelling surface roughness transient
摘 要：The human knee implant is computationally modelled in the mixed lubrication regime to investigate the tribological performance of the implant.This model includes the complex geometry of the implant components,unlike elliptical contact models that approximate this geometry.Film thickness and pressure results are presented for an ISO gait cycle to determine the lubrication regime present within the implant during its operation.It was found that it was possible for the lubrication regime to span between elastohydrodynamic,mixed and boundary lubrication depending on the operating conditions of the implant.It was observed that the tribological conditions present in one condyle were not necessarily representative of the other.Multiple points of contact were found within the same condyle,which cannot be computed by the elliptical contact solvers.This model can be used to balance forces in all directions,instead of only the normal loads,as often done in elliptical contact models.This work is an initial step towards understanding the role of the complex geometry in the tribological characteristics of the human knee implant when operating in physiological conditions.
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