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A "plate" in structural mechanics is defined by:
A{'text': 'Any flat object', 'label': 'A'}
B{'text': 'A 1D beam', 'label': 'C'}
C{'text': 'A 3D solid', 'label': 'D'}
D{'text': 'A flat structural element whose thickness is small compared to its other two dimensions, loaded primarily transverse to its plane', 'label': 'B'}
Answer & Solution
Correct answer: D. {'text': 'A flat structural element whose thickness is small compared to its other two dimensions, loaded primarily transverse to its plane', 'label': 'B'}
Plate theory applies when thickness t ≪ in-plane dimensions a, b. Loads act transverse (perpendicular) to the plate surface. Beyond t/L ≈ 1/10, "thin plate" theory (Kirchhoff) is valid; for thicker plates, Mindlin-Reissner is used.
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