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Warping of a thin-walled section under torsion refers to

  • A.Buckling of the skin panels
  • B.Permanent plastic deformation
  • C.Axial displacement of the cross-section
  • D.In-plane distortion of the section's shape

Answer: C

Points on the section move axially by differing amounts, so the section no longer remains plane. If that movement is restrained, for instance at a built-in end, additional direct stresses appear which simple torsion theory does not predict.

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