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Door and window corners are generously radiused principally to

  • A.Simplify manufacture of the frame
  • B.Reduce the stress concentration at the corner
  • C.Improve the appearance of the aircraft
  • D.Save weight in the surround

Answer: B

A sharp corner produces a severe local stress peak in a pressurised shell, and the early Comet failures made the consequence unmistakable. Rounding the corner spreads the flow of stress and raises the fatigue life by orders of magnitude.

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