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The KIRCHHOFF hypothesis specifically excludes which physical effect?
A{'text': 'Stretching', 'label': 'C'}
B{'text': 'Twisting', 'label': 'D'}
C{'text': 'TRANSVERSE SHEAR deformation — strains γ_xz and γ_yz are zero', 'label': 'B'}
D{'text': 'Bending', 'label': 'A'}
Answer & Solution
Correct answer: C. {'text': 'TRANSVERSE SHEAR deformation — strains γ_xz and γ_yz are zero', 'label': 'B'}
Kirchhoff: γ_xz = γ_yz = 0 by assumption. This is fine for thin plates where shear deformation is negligible, but underpredicts deflection for thick plates (t/L > ~1/20). Mindlin-Reissner relaxes this assumption.
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