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Discussion

Shear lag in a wide flange causes the direct stress to be

  • A.Higher away from the webs than predicted
  • B.Uniform across the whole flange
  • C.Zero at the webs
  • D.Lower away from the webs than predicted

Answer: D

The load has to travel into the flange by shear, and that transfer takes distance, so material far from a web is not fully stressed. Designers allow for it by counting only an effective width of skin as working, which is what the boom idealisation of a wing box quietly assumes.

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