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Doubling the wall thickness of a thin closed section, all else equal, changes its torsion constant by a factor of

  • A.2
  • B.8
  • C.4
  • D.1.41

Answer: A

In the closed-section expression the thickness appears only in the line integral in the denominator, so \( J \) is proportional to it. Contrast the open-section case, where the thickness is cubed and the same change would give a factor of eight.

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