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The vibration of instrument ball bearings in a controlled environment and the effect of the resulting fretting corrosion on bearing torque.
Fretting corrosion is a form of wear which occurs at the interface
of two contacting solid materials as the result of small, relative
vibratory motion. It is generally identified by the presence of a red
oxide, Fe203. Previously, the majority of the investigators studied
the fretting corrosion between two flat specimens or between a single
ball and a flat plate held in contact by a normal force. There are a
number of interrelated influencing factors involved in fretting
corrosion including: the vibration frequency and amplitude, the environmental
conditions, the characteristics of the material, and the
type of lubrication. The present investigation was conducted in order
to investigate the effects of frequency and amplitude of axial vibration
and the consequent accelerations acting to produce fretting damage
within an unlubricated instrument ball bearing. The effect of bearing
axial play on the fretting damage was also examined. The reproducibility
of the damage resulting from these variables was determined.