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The shear stress in a wall of a closed section under torsion is greatest

  • A.Where the wall is thinnest
  • B.Where the wall is thickest
  • C.At the corners of the section
  • D.Where the enclosed area is largest

Answer: A

Since the flow is constant round the cell and stress is flow over thickness, the thinnest wall carries the highest stress. That wall is therefore the critical one, which is a useful check when a designer is tempted to thin one face of a box to save weight.

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