Dresden 2026 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Gels, Polymer Networks and Elastomers I
CPP 49.4: Vortrag
Donnerstag, 12. März 2026, 12:15–12:30, ZEU/0255
Dynamic control of rigidity via geometric frustration — •Santiago Gomez Melo1,2, Falko Ziebert1,2, and Ulrich S. Schwarz1,2 — 1ITP, Philosophenweg 19, Heidelberg — 2BioQuant, Im Neuenheimer Feld 267, Heidelberg
Recent advances in materials design and 4D-printing now allow one to realize programmable metamaterials that upon receiving a suitable stimulus dynamically change their unconventional macroscopic properties. For mechanical metamaterial, these tunable features have so far been restricted to geometric quantities, such as the Poisson ratio and the strain-to-twist ratio, but the effective elastic moduli have not been addressed yet. Here we combine central force network theory and responsive hyperelasticity to show that it is also possible to dynamically control the elastic moduli, and more specifically the shear modulus, by programming geometric frustration into a stimuli-responsive structure. This phenomenon, known as geometric incompatibility, produces a rigidity phase transition in which the elastic modulus changes by several orders of magnitude. It results from inducing a state of self-stress that eliminates the floppy modes of the system by producing second-order rigidity. The underlying physical principle seems to be also at work in biological systems, most prominently in epithelial monolayers, but here it is predicted for entirely synthetic materials, like temperature-sensitive hydrogels and nematic elastomers, opening up the perspective of designing a new class of dynamic metamaterials.