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A student concludes that because a structure passed its ultimate load test, it will not crack in service. The conclusion is

  • A.Correct provided the material is aluminium
  • B.Correct only for redundant structure
  • C.Wrong; they are different questions
  • D.Correct

Answer: C

A structure can carry ultimate load comfortably and still crack after twenty thousand flights at a small fraction of that load. Fatigue is demonstrated by a separate cyclic test lasting several times the intended service life.

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