Discussion
Which of the following would NOT reduce the shear stress in a torsion box?
Answer: B
Correct answer: Reducing the enclosed area
Since \( \tau = T/(2At) \), the stress falls when the torque falls, when the enclosed area grows, or when the wall is thickened - and it rises when the enclosed area is reduced. Enclosed area is the cheapest of these levers in weight terms, which is why designers reach for it first.
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