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Dataset supporting the publication “Importance of dynamics in the finite element prediction of plastic damage of polyethylene acetabular liners under edge loading conditions”

Jahani, Faezeh and Etchels, Lee W. and Wang, Lin and Thompson, Jonathan and Barton, David and Wilcox, Ruth K. and Fisher, John and Jones, Alison C. (2021) Dataset supporting the publication “Importance of dynamics in the finite element prediction of plastic damage of polyethylene acetabular liners under edge loading conditions”. University of Leeds. [Dataset] https://doi.org/10.5518/971

Dataset description

This dataset contains the full set of output values from a modelling study, summarised as follows. After hip replacement, in cases where there is instability at the joint, contact between the femoral head and the acetabular liner can move from the bearing surface to the liner rim, generating edge loading conditions. This has been linked to polyethylene liner fracture and led to the development of a regulatory testing standard (ISO 14242:4) to replicate these conditions. Performing computational modelling alongside simulator testing can provide insight into the complex damage mechanisms present in hard-on-soft bearings under edge loading. The aim of this work was to evaluate the need for inertia and elastoplastic material properties to predict kinematics (likelihood of edge loading) and plastic strain accumulation (as a damage indicator). While a static, rigid model was sufficient to predict kinematics for experimental test planning, the inclusion of inertia, alongside elastoplastic material, was required for prediction of plastic strain behaviour. The delay in device realignment during heel strike, caused by inertia, substantially increased the force experienced during rim loading (e.g. 600 N static rigid, ~1800 N dynamic elastoplastic, in one case). The accumulation of plastic strain is influenced by factors including cup orientation, swing phase force balance, the moving mass, and the design of the device itself. Evaluation of future liner designs could employ dynamic elastoplastic models to investigate the effect of design feature changes on bearing resilience under edge loading.

Keywords: Hip replacement, ultra-high molecular weight polyethylene, finite element, edge loading, ISO testing.
Subjects: H000 - Engineering > H100 - General engineering > H160 - Bioengineering, biomedical engineering & clinical engineering
Divisions: Faculty of Engineering > School of Mechanical Engineering
Faculty of Biological Sciences > Institute of Medical and Biological Engineering
Faculty of Engineering > Institute of Medical and Biological Engineering
Faculty of Engineering > School of Mechanical Engineering > Institute of Medical and Biological Engineering
License: Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited: 13 May 2021 11:48
URI: http://archive.researchdata.leeds.ac.uk/id/eprint/840

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