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Composite laminates are notably weaker in which loading direction?

  • A.In in-plane shear
  • B.Through the thickness, where no fibres run
  • C.Along the fibres in tension
  • D.Along the fibres in compression

Answer: B

No reinforcement crosses the ply interfaces, so through-thickness strength is a matrix property and very low. Designs therefore avoid out-of-plane loads wherever possible, and features such as curved sections and joints receive special attention.

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