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A closed thin-walled section under shear is statically indeterminate because

  • A.The section has no centroid
  • B.Shear flow varies with thickness
  • C.There is no free edge to start from
  • D.The material is not linearly elastic

Answer: C

Cutting the section produces an open one that can be solved directly, but the cut has to be restored by a constant redundant shear flow. Finding that redundancy requires a compatibility condition on top of equilibrium, which is what makes the problem indeterminate.

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