Discussion
Match each analysis concern in List I with the appropriate treatment in List II.
List I
A. In-plane laminate stiffness
B. Free-edge delamination
C. Ply drop-off
D. First-ply failure
List II
1. A staggered, gradual taper
2. Classical laminate theory and the A matrix
3. A ply-level failure criterion
4. Interlaminar stress analysis beyond plane stress
Select the correct match.
Answer: B
Only the first is handled by the classical theory alone; the rest need either a detailed three-dimensional treatment or a design rule. That gap between the convenient theory and the real failure modes is why composite design leans so heavily on test.
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