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The maximum shear stress in a solid rectangular section under torsion occurs at

  • A.The corners of the section
  • B.The centroid
  • C.The midpoint of the shorter side
  • D.The midpoint of the longer side

Answer: D

The membrane analogy makes this immediate: the film is steepest where it meets the boundary furthest from the centre of the hole, that is at the middle of the long side. At a corner the film is flat against the boundary and the stress is actually zero.

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