An adaptive finite element simulation of fretting wear damage at the headneck taper junction of total hip replacement: The role of taper angle mismatch

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    Abstract

    An adaptive finite element simulation was developed to predict fretting wear in a head-neck taper junction of hip joint implant through a two dimensional (2D) model and based on the Archard wear equation. This model represents the most critical section of the head-neck junction which was identified from a 3D model of the junction subjected to one cycle of level gait loading. The 2D model was then used to investigate the effect of angular mismatch between the head and neck components on the material loss and fretting wear process over 4 million gait cycles of walking. Generally, junctions with distal angular mismatches showed a better resistance to fretting wear. The largest area loss in the neck after 4 million cycles of loading was 1.86E-02 mm2 which was found in the junction with a proximal mismatch angle of 0.124°. While, the minimum lost area (4.30E-03 mm2) was found in the junction with a distal angular mismatch of 0.024°. Contact stress, amplitude of sliding and contact length were found as the key parameters that can influence the amount of material loss and the process of fretting wear damage. These parameters vary over the fretting wear cycles and are highly dependent on the type and magnitude of the taper angle mismatch. This study also showed that lost area does not have a linear relationship with the mismatch angle of taper junctions.

    Original languageEnglish
    Pages (from-to)58-67
    Number of pages10
    JournalJournal of the Mechanical Behavior of Biomedical Materials
    Volume75
    DOIs
    Publication statusPublished - Nov 2017

    Keywords

    • Finite element simulation
    • Fretting wear
    • Hip implants
    • Material loss
    • Taper junction

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