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A laminate is described as balanced when

  • A.All plies are at zero degrees
  • B.The laminate is quasi-isotropic
  • C.Each off-axis ply is paired oppositely
  • D.The plies are mirrored about the mid-plane

Answer: C

Pairing each plus-angle ply with a minus-angle one removes the coupling between extension and in-plane shear. A laminate that is both symmetric and balanced behaves in-plane much like an orthotropic sheet, which greatly simplifies design.

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