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DY: Fachverband Dynamik und Statistische Physik

DY 16: Pattern Formation

DY 16.1: Hauptvortrag

Mittwoch, 13. März 2013, 09:30–10:00, H46

Dynamics of thin sheets: Crumpling, wrinkling and cracking — •Pascal Damman — Universite de Mons, Mons, Belgium

Thin elastic sheets are mechanically unstable to boundary or substrate-induced compressive loads. Moderate compression results in regular wrinkling while further confinement can lead to crumpling/folding or blistering. Close inspection of a simple candy wrap reveals that these patterns are universal and often coexist in the same object. These regions of stress focusing are often considered as a hindrance for technological applications, acting as nucleation points for mechanical failure. Conversely, they can be exploited constructively to build tailored 3D thin structures and to understand how the mechanical forces shape living systems, i.e., the morphogenesis.

This talk will be focused on the emergence of complex patterns for confined thin sheets. Two physical models will be described: the curtain model (i.e., a sheet confined at one edge) and the Euler buckling of a sheet resting on a soft foundation.