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A re-entrant corner in a section under torsion

  • A.Has no effect on the stress distribution
  • B.Concentrates stress, so it is filleted
  • C.Carries no stress at all
  • D.Reduces the maximum stress

Answer: B

The membrane must fold sharply into a re-entrant corner, giving a very steep slope and a high stress. A generous fillet eases the fold and reduces the peak, which is why such corners are always radiused in a machined fitting.

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