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The shear flow applied to a fuselage frame by the surrounding skin is

  • A.Distributed round its circumference
  • B.Concentrated at a single point
  • C.Zero everywhere
  • D.Applied only at the floor beam

Answer: A

The frame does not act alone: the skin feeds shear into it all the way round, and that distributed reaction is what balances the concentrated load applied to it. Ignoring it and treating the frame as a free ring badly overstates the bending moments.

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