Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-04-24
PRL 101, 074503 (2008)
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 7 figures, typos corrected, figure 5 replaced
Scientific paper
10.1103/PhysRevLett.101.074503
We study pattern formation during tensile deformation of confined viscoelastic layers. The use of a model system (PDMS with different degrees of crosslinking) allows us to go continuously from a viscous liquid to an elastic solid. We observe two distinct regimes of fingering instabilities: a regime called "elastic" with interfacial crack propagation where the fingering wavelength only scales with the film thickness, and a bulk regime called "viscoelastic" where the fingering instability shows a Saffman-Taylor-like behavior. We find good quantitative agreement with theory in both cases and present a reduced parameter describing the transition between the two regimes and allowing to predict the observed patterns over the whole range of viscoelastic properties.
Creton Costantino
Lindner Axel
Nase J.
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