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Which of these is NOT a valid conclusion from a successful static test to ultimate load?

  • A.The analysis has been validated at the gauged locations
  • B.The margins in the stress report are supported by evidence
  • C.The structure will not fail in fatigue during its service life
  • D.The structure sustained the highest design load without failing

Answer: C

Static strength and fatigue are entirely different questions: a structure can pass ultimate load comfortably and still crack after twenty thousand flights. Fatigue is demonstrated by a separate, far longer, cyclic test.

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