The Influence of Assembly Force on the Material Loss at the Metallic Head-Neck Junction of Hip Implants Subjected to Cyclic Fretting Wear
| Autor: | Reza Hashemi Oskouei, H. Badnava, Mark Taylor, Khosro Fallahnezhad |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
modular hip implants Materials science 0206 medical engineering Metals and Alloys Head neck Material removal 02 engineering and technology CoCrMo alloys 021001 nanoscience & nanotechnology 020601 biomedical engineering Raising (metalworking) Finite element method assembly force Fretting wear Gait (human) fretting wear finite element material loss Head (vessel) General Materials Science Composite material 0210 nano-technology Walking gait lcsh:Mining engineering. Metallurgy |
| Zdroj: | Metals Volume 9 Issue 4 Metals, Vol 9, Iss 4, p 422 (2019) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met9040422 |
| Popis: | The impaction force required to assemble the head and stem components of hip implants is proven to play a major role in the mechanics of the taper junction. However, it is not clear if the assembly force could have an effect on fretting wear, which normally occurs at the junction. In this study, an adaptive finite element model was developed for a CoCr/CoCr head-neck junction with an angular mismatch of 0.01° in order to simulate the fretting wear process and predict the material loss under various assembly forces and over a high number of gait cycles. The junction was assembled with 2, 3, 4, and 5 kN and then subjected to 1,025,000 cycles of normal walking gait loading. The findings showed that material removal due to fretting wear increased when raising the assembly force. High assembly forces induced greater contact pressures over larger contact regions at the interface, which, in turn, resulted in more material loss and wear damage to the surface when compared to lower assembly forces. Although a high assembly force (greater than 4 kN) can further improve the initial strength and stability of the taper junction, it appears that it also increases the degree of fretting wear. Further studies are needed to investigate the assembly force in the other taper designs, angular mismatches, and material combinations. |
| Databáze: | OpenAIRE |
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