Abstract
Fretting-corrosion tests using varying cantilever-shaped contact geometries (representing varying compliances) were performed using Ti-6Al-4V and CoCrMo alloys in combination. Fretting mechanics and fretting corrosion currents were used to determine fretting corrosion regime boundaries between stick, stick-slip, and slip for each interfacial compliance. Results showed a highly-correlated and material-dependent relationship between work of fretting (dissipated energy) and fretting current. A high interfacial compliance reduced relative fretting micromotion, induced stick and stick-slip conditions at lower loads, and were more robust against smaller displacements. Additional alloy-dependent effects were observed. Fretting corrosion maps were developed to characterize each interface's contact conditions over a range of forces and displacements. These results could be used in design-based solutions that encourage head-neck taper locking, minimizing mechanically-assisted corrosion in vivo.
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