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An engineer designs an open channel to carry a large torque. The design is

  • A.Sound provided the material is steel
  • B.Poor only if the channel is short
  • C.Poor; an open section is very soft in torsion
  • D.Sound

Answer: C

An open section resists torque only by the feeble St Venant mechanism, so it twists enormously and reaches high stresses at modest torque. Closing the section, even with a light panel, transforms its behaviour and is almost always the right answer.

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