Elastic thin films attached to a foundation under compression develop wrinkles, which in turn can generate invaginated folds. Hierarchical patterns of localized folds have now been observed in thin films under biaxial compression, which show intriguing resemblance to fracture patterns in drying pastes and to venation networks in leaves.
Philip Johannes Walter Moll, Matthias Carsten Putzke, Andrew Scott Hunter
Pedro Miguel Nunes Pereira de Almeida Reis
Franz-Josef Haug, Johann Michler, Jean-Marc Breguet