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A closed tube with a longitudinal slit cut along its full length

  • A.Retains almost all its torsional stiffness
  • B.Becomes stiffer in torsion
  • C.Is unaffected in torsion but weaker in bending
  • D.Loses almost all its torsional stiffness

Answer: D

The slit destroys the circulating shear flow and leaves only the St Venant mechanism, so the stiffness collapses by orders of magnitude. Bending stiffness, by contrast, is barely touched, which makes the demonstration a striking one.

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