Discussion
Assertion (A): Free-edge stresses cannot be predicted by classical laminate theory.
Reason (R): The theory assumes a state of plane stress in each ply.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is exactly why. Classical laminate theory assumes plane stress in every ply, so the through-thickness stress components are zero by construction and cannot be computed. At a free edge those very components are large, arising from the mismatch in Poisson’s ratio and shear coupling between adjacent plies - which is why edge delamination needs a three-dimensional analysis.
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