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Rate of twist of a single-cell closed section is obtained from

  • A.The bending moment divided by EI
  • B.The enclosed area divided by the perimeter
  • C.A line integral of q over t round the cell
  • D.The maximum shear stress alone

Answer: C

The rate of twist follows from integrating the shear strain round the cell, giving an expression containing the flow divided by thickness and the shear modulus. It is what allows a multi-cell problem to be closed, by requiring every cell to twist at the same rate.

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