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From the same thesis as the previous 4 slides.
NOTE: What is called “wrinkling” in (b) is not the same mode called “wrinkling” 2 slides ago, but it is a much shorter wavelength mode usually called “face sheet wrinkling”. This “face sheet wrinkling” mode resembles the buckling mode of an axially compressed thin flat plate resting on an infinitely deep elastic foundation, which plays a role only in a neighborhood of the face sheet of the order of the face sheet wrinkling wavelength. Because the wavelength of face sheet wrinkling is so short (short compared to the depth of the core) one face sheet wrinkling occurs independently of that of the opposite face. That is not so for what is called “wrinkling” two slides ago, in which the wavelength of the buckle is the same order as the depth of the core.
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