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A SYMMETRIC CROSS-PLY laminate has which simplification in the ABD matrix?
A{'text': 'Only A is non-zero', 'label': 'A'}
B{'text': 'B = 0 (from symmetry) AND A_16 = A_26 = D_16 = D_26 = 0 (from cross-ply orientations) — the laminate is "specially orthotropic"', 'label': 'B'}
C{'text': 'D = 0', 'label': 'C'}
D{'text': 'A = D', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'B = 0 (from symmetry) AND A_16 = A_26 = D_16 = D_26 = 0 (from cross-ply orientations) — the laminate is "specially orthotropic"', 'label': 'B'}
Symmetric ⇒ B = 0. Cross-ply (only 0°, 90°) ⇒ A_16 = A_26 = 0 (no off-axis couplings). Combined: the laminate behaves like an orthotropic plate in both extension and bending. Easiest to analyze.
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