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An UNSYMMETRIC laminate cooled from cure temperature back to room temperature typically:
A{'text': 'Remains perfectly flat', 'label': 'A'}
B{'text': 'Develops residual curvature (warpage) because B ≠ 0 couples thermal-in-plane contraction to bending', 'label': 'B'}
C{'text': 'Cracks immediately', 'label': 'C'}
D{'text': 'Becomes stronger', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Develops residual curvature (warpage) because B ≠ 0 couples thermal-in-plane contraction to bending', 'label': 'B'}
Thermal contraction differs across plies (anisotropy + orientation). With B ≠ 0, the resulting in-plane strain mismatch couples to bending moments → curvature. Symmetric layups eliminate this by making B = 0 — the design rule that drives most production composites symmetric.
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