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A unidirectional lamina is described as orthotropic because

  • A.It has no measurable stiffness
  • B.It contains fibres in every direction
  • C.Its properties differ along three axes
  • D.Its properties are the same in every direction

Answer: C

Distinct properties along the fibres, transverse to them and through the thickness require far more elastic constants than an isotropic metal. Four independent constants describe a lamina in plane stress against two for a metal.

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