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To maximize BENDING stiffness D_11 of a laminate of fixed total thickness h, the 0°-fiber plies should be placed:
A{'text': 'Near the mid-plane', 'label': 'A'}
B{'text': 'At the FURTHEST POSITIONS from the mid-plane (top and bottom) — sandwich-like distribution', 'label': 'B'}
C{'text': 'Randomly', 'label': 'C'}
D{'text': 'All in one half', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'At the FURTHEST POSITIONS from the mid-plane (top and bottom) — sandwich-like distribution', 'label': 'B'}
D_ij ∝ z³. Plies near the surface contribute much more than plies near the mid-plane. Aerospace structural designers exploit this: stiff 0° plies on the outside, less critical 90° or ±45° plies in the interior.
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