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A quasi-isotropic laminate has

  • A.In-plane properties independent of direction, though not through the thickness
  • B.Identical properties in every direction including through the thickness
  • C.All plies at zero degrees
  • D.No stiffness in shear

Answer: A

Layups such as zero, plus and minus forty-five and ninety in equal proportion give in-plane stiffness the same in every direction. It is a convenient starting point, though it wastes much of the advantage of tailoring the layup to the load.

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