Contact: Kevin Stacey
Caption: With increased compression, a flat surface with a stiffness boundary layer (a) can become a wrinkle (b) and then a fold (c). Other possibilities include an instantaneous crease (d), a wrinkle-crease (e) or a fold-crease (f).
Credit: Kim lab / Brown University
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Related news release: Mathematical models explain how a wrinkle becomes a crease