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The shear stress at a sharp corner of a section under torsion is

  • A.Zero
  • B.Infinite
  • C.A maximum
  • D.Equal to the average value

Answer: A

The membrane over a corner lies flat against the boundary on two sides, so its slope, and hence the stress, vanishes. This is the outside corner of a rectangle; a re-entrant corner is the opposite case and concentrates stress severely.

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