Discussion
A closed wing box of enclosed area \( 0.9 \) m\( ^2 \) carries a torque of \( 180 \) kN m. The shear flow round it is
Answer: B
The Bredt-Batho relation gives \( q = T/(2A) = 180\,000/(2 \times 0.9) = 100 \) kN/m. Note that the enclosed area, not the material area, is what appears, which is why closing the cell is so much more effective than adding material to an open one.
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