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In a symmetric balanced cross-ply laminate, A_16 = A_26 = 0 simplifies which physical behavior?
A{'text': 'No simplification', 'label': 'A'}
B{'text': 'No EXTENSION-SHEAR COUPLING: applying axial force does NOT cause in-plane shear deformation, and applying shear does NOT cause axial extension', 'label': 'B'}
C{'text': 'It eliminates bending', 'label': 'C'}
D{'text': 'Material becomes isotropic', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'No EXTENSION-SHEAR COUPLING: applying axial force does NOT cause in-plane shear deformation, and applying shear does NOT cause axial extension', 'label': 'B'}
A_16 and A_26 are extension-shear coupling terms. When they vanish (achievable via balanced and/or cross-ply), uniaxial tension produces only axial strain (no shear distortion). This is what students mean when they say a laminate "behaves orthotropically" in-plane.
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