Transient mixed lubrication model of the human knee implant
Abstract 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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-12-01
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| Series: | Biosurface and Biotribology |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/bsb2.12020 |
| _version_ | 1811195761414635520 |
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| author | Hamza Butt Lee Nissim Leiming Gao Connor Myant Greg deBoer Robert Hewson |
| author_facet | Hamza Butt Lee Nissim Leiming Gao Connor Myant Greg deBoer Robert Hewson |
| author_sort | Hamza Butt |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-04-12T00:48:14Z |
| format | Article |
| id | doaj.art-821636b7273549028c028b80b32ffdd8 |
| institution | Directory Open Access Journal |
| issn | 2405-4518 |
| language | English |
| last_indexed | 2024-04-12T00:48:14Z |
| publishDate | 2021-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Biosurface and Biotribology |
| spelling | doaj.art-821636b7273549028c028b80b32ffdd82022-12-22T03:54:48ZengWileyBiosurface and Biotribology2405-45182021-12-017420621810.1049/bsb2.12020Transient mixed lubrication model of the human knee implantHamza Butt0Lee Nissim1Leiming Gao2Connor Myant3Greg deBoer4Robert Hewson5Department of Aeronautics Imperial College London London UKDepartment of Mechanical Engineering University of Bath Bath UKDepartment of Engineering Nottingham Trent University Nottingham UKDyson School of Design Engineering Imperial College London London UKSchool of Mechanical Engineering University of Leeds Leeds UKDepartment of Aeronautics Imperial College London London UKAbstract 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.https://doi.org/10.1049/bsb2.12020complex geometryknee implantmixed lubrication modellingsurface roughnesstransient |
| spellingShingle | Hamza Butt Lee Nissim Leiming Gao Connor Myant Greg deBoer Robert Hewson Transient mixed lubrication model of the human knee implant Biosurface and Biotribology complex geometry knee implant mixed lubrication modelling surface roughness transient |
| title | Transient mixed lubrication model of the human knee implant |
| title_full | Transient mixed lubrication model of the human knee implant |
| title_fullStr | Transient mixed lubrication model of the human knee implant |
| title_full_unstemmed | Transient mixed lubrication model of the human knee implant |
| title_short | Transient mixed lubrication model of the human knee implant |
| title_sort | transient mixed lubrication model of the human knee implant |
| topic | complex geometry knee implant mixed lubrication modelling surface roughness transient |
| url | https://doi.org/10.1049/bsb2.12020 |
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