Imperial College London
Portrait Picture

Professor Rob Hewson

Faculty of Engineering, Department of Aeronautics

Professor of Multidisciplinary Design Optimisation
 
 
 
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Contact

 

r.hewson Website

 
 
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Location

 

341City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gao:2015:10.1002/jbm.b.33568,
author = {Gao, L and Dowson, D and Hewson, RW},
doi = {10.1002/jbm.b.33568},
journal = {Journal of Biomedical Materials Research - Part B Applied Biomaterials},
pages = {497--506},
title = {Predictive wear modelling of the articulating metal-on-metal hip replacements},
url = {http://dx.doi.org/10.1002/jbm.b.33568},
volume = {105},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The lubrication regime in which artificial hip joints operate adds complexity to the prediction of wear, as the joint operates 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. In this work a wear model is developed which considers lubrication for the first time via a transient EHL model of metalonmetal 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, including tribocorrosion, in the lubricated hip implants. The wear model applied here is based on the work of Sharif et al. who adapted the Archard wear law by making the wear rate a function of a relative film thickness nominalized by surface roughness for examining wear of industrial gears. In this work the gait cycle employed in hip simulator tests is computationally investigated and wear is predicted for two sizes of metal-onmetal total hip replacements. The wear results qualitatively predict the typical wear curve obtained from experimental hip simulator tests, with an initial ‘runningin period’ before a lower wear rate is reached. The shape of the wear scar has been simulated on both the acetabular cup and femoral head bearing surfaces.
AU  - Gao,L
AU  - Dowson,D
AU  - Hewson,RW
DO  - 10.1002/jbm.b.33568
EP  - 506
PY  - 2015///
SN  - 1552-4981
SP  - 497
TI  - Predictive wear modelling of the articulating metal-on-metal hip replacements
T2  - Journal of Biomedical Materials Research - Part B Applied Biomaterials
UR  - http://dx.doi.org/10.1002/jbm.b.33568
UR  - http://hdl.handle.net/10044/1/27021
VL  - 105
ER  -
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