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Discussion

The single most important idea carried across this whole topic is that

  • A.Static strength is always the governing consideration
  • B.Every member is sized by the same criterion
  • C.Analysis alone is sufficient evidence
  • D.The first failure mode to arrive sizes it

Answer: D

Static strength, stability, fatigue and joint modes each have their own allowable, and the lowest governs. Identifying which one that is for each member, and demonstrating a positive margin against it, is the whole substance of airframe stress work.

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