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An open channel and a closed box of the same wall material differ in torsional stiffness typically by a factor of order

  • A.A thousand or more
  • B.About two
  • C.About ten
  • D.About one

Answer: A

The open section relies on the St Venant mechanism, with its cube on the wall thickness, while the closed one develops a circulating flow round the enclosed area. Three orders of magnitude is common, which is why a slit cut along a torsion tube is so catastrophic.

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