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The engineers' theory of bending gives the direct stress in a symmetric section as

  • A.Moment times distance, over second moment
  • B.The bending moment times the second moment of area, over the distance
  • C.The shear force times the distance, over the second moment of area
  • D.The bending moment over the cross-sectional area

Answer: A

For a section symmetric about the plane of bending the stress varies linearly with distance from the neutral axis, giving the familiar expression. It rests on plane sections remaining plane, a linearly elastic material and bending about a principal axis, and every one of those assumptions has to be revisited for an unsymmetric section.

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