Discussion
A wing box carries \( 300 \) kN m of torque with an enclosed area of \( 1.5 \) m\( ^2 \) and a critical wall \( 2 \) mm thick. The shear stress there is
Answer: D
The flow is \( 300\,000/(2 \times 1.5) = 100 \) kN/m, and dividing by the thickness gives \( 100\,000/0.002 = 50 \) MPa. Checking the thinnest wall is the essential step, since it is always the critical one under torsion.
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