The experimental technique used in this investigation is based on magnetic sensing of local thermoelectric currents produced by material imperfections when a temperature gradient is established in the material. These thermoelectric currents generate flux magnetic densities that are detected by a highly sensitive magnetometer. According to our preliminary results, the magnetic flux density measurements was found to be rather sensitive to changes in near-surface layers produced by the fretting damage in Ti-6Al-4V alloy specimens with the exception of the intrinsic material background magnetic signal that affected deeply the detectability of subtle material variations in noncontacting thermoelectric measurements. Hopefully, these results can help identify a non-destructive lest method that can detect the level of fretting damage in metals, that is difficult to characterize by other well known NDE methods.
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