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Aluminium alloys differ from steels in fatigue in that aluminium

  • A.Never fails in fatigue
  • B.Fails only above its yield stress
  • C.Has no true endurance limit
  • D.Has a well-defined endurance limit

Answer: C

A steel S-N curve flattens to a horizontal asymptote below which failure does not occur, but an aluminium curve continues to fall. Aluminium components are therefore quoted with a fatigue strength at a stated number of cycles rather than an endurance limit.

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