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From the same paper as the previous 2 images.
Photograph supplied by Michael Nemeth, NASA Langley Research Center, Hampton, Virginia
Buckling of a different externally isogrid-stiffened axially compressed Lexan cylindrical shell (not the specimen shown in the previous slide). The buckling half-wavelength appears to be approximately equal to the diameter of one hexagon of the isogrid stiffening pattern.
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