Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 39: Pattern Formation and Reaction-Diffusion Systems

DY 39.2: Vortrag

Donnerstag, 8. September 2022, 10:15–10:30, H19

Wrinkling in Curved Films — •Megha Emerse and Lucas Goehring — Nottingham Trent University, Nottingham, United Kingdom

Thin films or sheets exposed to external forces can become unstable to drastic shape changes, often forming regular or periodic patterns like wrinkles, folds, creases, etc. This can be distinctly observed when one tries to wrap a world map onto a globe since it is unachievable without creating any wrinkles. Wrinkling is a self-initiated process, spontaneously generating periodic structures out of a uniformly smooth surface and represents a pathway for simply creating regular surface topography. Here, we study thin elastic membranes that form complex wrinkle patterns when put on substrates where there is a mismatch in their inherent shape. Using 3D-printed moulds, we prepare elastic membranes with different curvatures, including cases of positive and negative Gaussian curvature, and shapes with two distinct principal curvatures. Through these, we experimentally investigate the dependence of the amplitude and wavelength of the wrinkles that spontaneously form when these curved membranes are constrained by a flat fluid substrate. We also study how these properties change along the membrane, for example with distance from the film edges.