How to recognize fretting corrosion and what to do about it

By Paul Dvorak Scott Eatherton
Scott Eatherton / CEO / Wind Driven LLC
Question: What is the quickest way to find the weak points in a mechanical design?
Answer: Install it in a wind turbine.
It’s not a joke. Load spectrums in wind turbines are unique. The wide variations in wind speeds produce wide ranges of shaft torque, nacelle motion, and faulting events that lead to high-frequency vibrations, impact loading, and torque reversals. So in addition to the fatigue modes of micropitting, axial cracking and spalling, the near constant changes in acceleration subject wind turbines to a well understood, highly destructive, yet little-recognized wear mode: Fretting corrosion.
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