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The Bredt-Batho theory gives the shear flow in a single-cell closed section under pure torsion as

  • A.The torque divided by twice the enclosed area
  • B.The torque divided by the enclosed area
  • C.The torque multiplied by twice the enclosed area
  • D.The torque divided by the wall thickness

Answer: A

The shear flow is constant round the cell and equals the torque over twice the area enclosed by the wall centreline. Note that it is the enclosed area that matters, not the area of material, which is why closing a section is so much more effective than thickening it.

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