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A laminate is described as symmetric when

  • A.It has an even number of plies
  • B.The stacking sequence is mirrored about the mid-plane
  • C.It contains equal numbers of plies at plus and minus forty-five degrees
  • D.All plies are at the same angle

Answer: B

Symmetry about the mid-plane removes the coupling between in-plane loading and bending, so the laminate does not warp when loaded or when cooled from cure. Almost all practical laminates are made symmetric for this reason.

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