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Which statement about aluminium in fatigue is TRUE?

  • A.It has a well-defined endurance limit like steel
  • B.It is immune to fatigue below yield
  • C.Its S-N curve is horizontal
  • D.It has no true endurance limit

Answer: D

The aluminium S-N curve continues to fall rather than flattening, so no stress is safe indefinitely. This is why aluminium airframes are managed by finite life and inspection rather than declared immune below some threshold.

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