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These “global” buckling modes have wavelengths that are long compared to the thickness of a face sheet. The four images with the shorter wavelengths might, in a buckled test specimen, appear locally from core shear crimping. The buckling modes (b1) and (c1) are usually associated with smaller load factors (eigenvalues) than those associated with (b2) and (c2).
From the same thesis as the previous 2 slides.
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