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In the web common to two cells of a multi-cell box, the net shear flow is

  • A.The difference of the two cell flows
  • B.The sum of the two cells' shear flows
  • C.Always zero
  • D.Equal to the larger of the two

Answer: A

Correct answer: The difference of the two cell flows

Each cell carries its own circulating flow, and in the shared web those circulations run in opposite directions - one clockwise, the other anticlockwise as seen from the web. The net flow is therefore \( q_1 - q_2 \), which is why interior webs of a multi-cell box are typically the least stressed and can be made light.

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