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In the membrane analogy, the shear stress at a point corresponds to

  • A.The height of the membrane at that point
  • B.The volume beneath the membrane
  • C.The area of the hole
  • D.The slope of the membrane at that point

Answer: D

Steep slopes mean high stress, which is why the analogy shows immediately that a re-entrant corner is a stress raiser and that the film is steepest at the edge of a narrow strip. Twice the volume under the film gives the torque the section carries.

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