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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 72: Polymer Networks and Elastomers
CPP 72.7: Vortrag
Mittwoch, 18. März 2020, 17:00–17:15, ZEU 114
Morphology of adhesive creases — •Michiel van Limbeek1, Martin Essink2, Anupam Pandey3, Jacco Snoeijer2, and Stefan Karpitschka1 — 1Max Planck Institue for Dynamics and Selforgization, Göttingen, Germany — 2University of Twente, Enschede, the Netherlands — 3Cornell University, Ithaca, the Unitied States of America
The compression of an elastic material beyond a certain strain turns the free surface to become unstable. The material makes a sharp fold of the surface onto itself, releasing elastic energy in the bulk. The resulting morphologies are observed in growing tissues and swelling gels. Self adhesion within the folded region is known to affect nucleation and hysteresis: A uncreased sample requires a higher critical strain for creasing than a previously creased one. However, a detailed description of the crease phenomena has remained elusive. Here we resolve the geometry and mechanics of adhesive creases. We combine numerical simulations, analysis and experimental results, where we pay specific attention to the singular edge of the self-contact, which we managed to visualize using confocal microscopy. In the region of self contact, a competition emerges between elastic and surface energies. We compare the morphology for different gel-stiffnesses and it turns out that adhesive creases exhibit a universal shape after proper rescaling. We derive a scaling theory for the aforementioned bifurcation scenario of the hysteresis, explaining the nucleation of adhesive creases.