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In unsymmetric bending, the neutral axis is

  • A.Generally not perpendicular to the plane of the applied moment
  • B.Always perpendicular to the plane of the applied moment
  • C.Always parallel to the applied moment vector
  • D.Undefined

Answer: A

Only when bending occurs about a principal axis does the neutral axis lie perpendicular to the moment. With a non-zero product of inertia the section prefers to bend about a different direction, so the neutral axis rotates away and a moment applied in one plane produces deflection in another.

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