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Corrosion interacts with fatigue by

  • A.Strengthening the surface layer
  • B.Preventing crack growth entirely
  • C.Having no measurable effect
  • D.Creating pits that initiate cracks

Answer: D

A corrosion pit is a stress concentration and a ready-made initiation site, so corrosion fatigue produces far shorter lives than either mechanism alone. It is a major driver of structural maintenance on ageing aircraft, particularly in humid operating environments.

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