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The torsional shear stress in a thin closed section under a given torque is reduced most effectively by

  • A.Increasing the length of the member
  • B.Using a material of higher shear modulus
  • C.Reducing the wall thickness
  • D.Enlarging the area enclosed by the wall centrelines

Answer: D

The shear flow varies inversely with the enclosed area, so enlarging the cell reduces both flow and stress directly. A higher shear modulus reduces the twist but not the stress, and thinning the wall raises the stress rather than lowering it.

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