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Shear flow analysis of a wing box normally proceeds by

  • A.Ignoring the closed nature of the section
  • B.Assuming the shear flow is zero everywhere
  • C.Treating each wall as an independent beam
  • D.Cut it open, solve, then restore the redundancy

Answer: D

The cut turns the indeterminate problem into a determinate one that can be solved by the open-section method, after which the constant redundant flow is added back using a compatibility condition. Where the cut is placed makes no difference to the final answer.

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