Discussion
Coupling between extension and bending in a laminate is represented by
Answer: D
Correct answer: The B matrix
Classical laminate theory writes the laminate stiffness as three matrices. A relates in-plane forces to in-plane strains, D relates moments to curvatures, and B couples the two - so a non-zero B means stretching the laminate also bends it. B vanishes for a symmetric stacking sequence, which is why symmetry is imposed on almost every structural laminate.
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