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Free-edge stresses in a laminate are significant because they

  • A.Occur only under thermal loading
  • B.Are out-of-plane and can initiate delamination at a cut edge
  • C.Act only in the fibre direction
  • D.Are predicted correctly by classical laminate theory

Answer: B

Mismatch between adjacent plies produces interlaminar stresses that classical laminate theory cannot represent, since it assumes plane stress. They peak at a free edge and are a common site for delamination initiation.

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