Secrets of surfaces' wrinkling, folding, creasing and delaminating are unraveled

Secrets of surfaces' wrinkling, folding, creasing and delaminating are unraveled

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The process of wrinkle formation is familiar to anyone who has ever sat in a bathtub a little too long. But exactly why layered materials sometimes form one kind of wrinkly pattern or another -- or even other variations, such as creases, folds, or delaminated buckles -- has now been explained at a fundamental level.