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Plane sections remaining plane is an assumption that fails most noticeably in the presence of

  • A.A uniform bending moment
  • B.A linearly elastic material
  • C.Significant shear lag
  • D.A symmetric cross-section

Answer: C

Shear deformation in wide, thin flanges means the direct stress does not reach the value simple theory predicts at points remote from the webs. The effect, known as shear lag, matters on wide wing boxes and is handled by using an effective width rather than the full flange.

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