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Discussion

The majority of fatigue cracks in an airframe originate at

  • A.The neutral axis of the wing box
  • B.The interior of a forging
  • C.Fastener holes and other stress concentrations
  • D.The middle of an unbroken skin panel

Answer: C

A hole roughly triples the local stress, and the drilling process itself leaves a damaged edge. That is why hole quality, cold working and interference-fit fasteners receive so much attention in fatigue-critical structure.

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