Discussion
Assertion (A): A closed section is vastly stiffer in torsion than an open one of the same material.
Reason (R): A closed cell develops a shear flow circulating round the enclosed area.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. The open section can only resist by St Venant shear varying through the wall thickness, a mechanism carrying a cube on a very small dimension. The difference commonly runs to three orders of magnitude.
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