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Fretting fatigue occurs where

  • A.A crack has already reached critical length
  • B.Clamped surfaces undergo micro-slip
  • C.A surface is exposed to a corrosive fluid
  • D.A member is loaded in pure compression

Answer: B

Micro-slip at a joint interface damages the surface and creates initiation sites far earlier than plain fatigue would. Lap joints, bolted fittings and spline couplings are the usual locations, and it can cut fatigue strength by half or more.

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