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Which condition is SUFFICIENT to make B = 0 (zero coupling between in-plane and bending)?
A{'text': 'Balanced laminate', 'label': 'A'}
B{'text': 'SYMMETRIC laminate about the mid-plane — every ply at +z mirrored by an identical ply at −z', 'label': 'B'}
C{'text': 'Cross-ply laminate', 'label': 'C'}
D{'text': 'Quasi-isotropic', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'SYMMETRIC laminate about the mid-plane — every ply at +z mirrored by an identical ply at −z', 'label': 'B'}
Symmetric stacking ensures the contributions of paired plies to B (which contains odd powers of z relative to mid-plane) cancel exactly. Standard design rule: always cure laminates symmetric to avoid warpage.
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