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A laminate is called BALANCED if:
A{'text': 'It has the same number of plies in 0° and 90°', 'label': 'A'}
B{'text': 'For every ply at +θ, there is an identical ply at −θ — making A_16 = A_26 = 0 (no axial-shear coupling)', 'label': 'B'}
C{'text': 'It has equal mass on both faces', 'label': 'C'}
D{'text': 'It is symmetric', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'For every ply at +θ, there is an identical ply at −θ — making A_16 = A_26 = 0 (no axial-shear coupling)', 'label': 'B'}
Balanced means paired ±θ off-axis plies. The off-axis terms in their stiffness contributions cancel in A_16 and A_26, eliminating in-plane axial-shear coupling. Independent of whether the laminate is symmetric.
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