Discussion
Assertion (A): Through-thickness strength is the weakest direction in a laminate.
Reason (R): No fibre reinforcement crosses the ply interfaces.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the whole of it. All the reinforcement lies in the plane of the plies, so through the thickness the only thing holding the laminate together is the matrix and the interface. That is why delamination is the characteristic composite failure, why impact is so damaging, and why through-thickness reinforcement such as stitching or z-pinning is pursued.
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