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A structural repair to a fatigue-critical area must

  • A.Avoid any fasteners
  • B.Restore the load path without introducing new stress concentrations
  • C.Be as stiff as possible regardless of the surroundings
  • D.Use the strongest available alloy in every case

Answer: B

An over-stiff patch attracts load and can create a worse concentration at its own boundary than the damage it repaired. Repair design is therefore about matching stiffness and easing the transition, not simply about adding material.

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