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A CROSS-PLY laminate consists only of:
A{'text': 'Plies at +45° and −45°', 'label': 'A'}
B{'text': 'Plies at 0° and 90° only (no off-axis angles)', 'label': 'B'}
C{'text': 'Plies at random angles', 'label': 'C'}
D{'text': 'Plies all at 0°', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Plies at 0° and 90° only (no off-axis angles)', 'label': 'B'}
Cross-ply: only 0° and 90° plies. Naturally A_16 = A_26 = 0 (no off-axis terms) and, if symmetric, also D_16 = D_26 = 0. Used when bidirectional in-plane stiffness is wanted with simple design.
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