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Biotribology

The tribological behavior of different polymeric materials was evaluated for hip prostheses applications. Three polymeric materials were tested with fixed conditions of contact stress and sliding velocity. In a second phase, the material which presented the best results was selected.

Because of the potential use of Peek (Poly-ether-ether-ketone) and 30% Carbon Fibre Reinforced Peek (Peek-CF30) for orthopedic application, it was decided to investigate the effect of carbon fibre reinforcement and the significance of different variables, such as counterface roughness, sliding velocity and contact stress on frictional behavior.

A pin-on-disc Plint TE67 connected to a computer was used to measure the friction evolution under dynamic contact stress and sliding speed condition applied according to a sinusoidal function. This sinusoidal model tries to approximately reproduce the human walking conditions on the hip joint system. The treatment of experimental results was based on Taguchi's techniques and on the ANOVA - Analysis of Variance. Scanning electron microscopy (SEM) analysis and energy dispersive spectroscopy (EDS) X-ray microanalysis were made in a post test examination.

Sinusoidal function