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What is the physical meaning of a NON-ZERO B matrix in a laminate?
A{'text': 'The laminate is broken', 'label': 'A'}
B{'text': 'BENDING-EXTENSION COUPLING: in-plane forces cause curvature, and bending moments cause in-plane strains', 'label': 'B'}
C{'text': 'Material is anisotropic', 'label': 'C'}
D{'text': 'Plies are too thin', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'BENDING-EXTENSION COUPLING: in-plane forces cause curvature, and bending moments cause in-plane strains', 'label': 'B'}
B couples in-plane and bending response. A non-symmetric layup (B ≠ 0) means pulling on the laminate also bends it, and bending also stretches it. Often undesirable — causes warpage during cure cooldown.
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