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Which of these is NOT a limitation of classical laminate theory?

  • A.It cannot predict free-edge interlaminar stresses
  • B.It assumes a perfect bond between plies
  • C.It cannot compute the in-plane stiffness of a laminate
  • D.It assumes plane stress in each ply

Answer: C

Correct answer: It cannot compute the in-plane stiffness of a laminate

Computing the in-plane stiffness is exactly what classical laminate theory does best - the A matrix is its principal output and it is reliable. The other three are genuine limitations: no free-edge interlaminar stresses, an assumed perfect bond between plies, and plane stress in each ply, the last of which is the source of the first.

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