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At a point on a wing box skin under combined bending and torsion, the stress state is

  • A.A direct stress alone
  • B.A shear stress alone
  • C.Hydrostatic
  • D.A direct stress and a shear stress

Answer: D

Bending supplies the direct stress along the span and torsion supplies the shear flow around the section, and both act at the same point. Resolving them into principal stresses or an equivalent stress is what allows a strength check to be made.

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