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For a SYMMETRIC laminate, the 6×6 ABD system decouples into:
A{'text': 'Two 3×3 systems: in-plane {N} = A·{ε°} and bending {M} = D·{κ}', 'label': 'A'}
B{'text': 'Three 2×2 systems', 'label': 'B'}
C{'text': 'A single 6×6 system as before', 'label': 'C'}
D{'text': 'It does not decouple', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Two 3×3 systems: in-plane {N} = A·{ε°} and bending {M} = D·{κ}', 'label': 'A'}
With B = 0, the upper-right and lower-left coupling blocks vanish. The full 6×6 collapses into independent 3×3 systems: forces ↔ in-plane strains via A, and moments ↔ curvatures via D. Massive analytical simplification.
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