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Bending stiffness of a beam is measured by the product of

  • A.The shear modulus and the second moment of area
  • B.The density and the second moment of area
  • C.Young's modulus and the second moment of area
  • D.Young's modulus and the cross-sectional area

Answer: C

The quantity EI appears throughout beam deflection theory, so stiffness may be raised either by choosing a stiffer material or by distributing the same material further from the neutral axis. In airframes the second route is almost always the cheaper one in weight.

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