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Cabin pressurisation loads the fuselage skin principally in

  • A.Hoop and longitudinal tension
  • B.Compression along the fuselage axis
  • C.Torsion about the fuselage axis
  • D.Pure shear

Answer: A

An internally pressurised cylinder carries a hoop stress and a longitudinal stress, the hoop being twice the longitudinal for a thin shell. The cyclic nature of that loading over many flights is the reason fuselage fatigue and crack growth receive so much attention.

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