Creasing in evaporation-driven cavity collapse

Matt P. Milner, Lihua Jin, Shelby B. Hutchens

Research output: Contribution to journalArticlepeer-review

Abstract

We report on crease morphology and evolution at the surface of contracting cavities embedded within elastomeric solids of varying composition (Sylgard 184: pre-polymer to crosslinker mixing ratios of 10:1, 12:1, 17.5:1, and 25:1). Cavity contraction is achieved through evaporation of an embedded 10 μL liquid droplet. In validation of recent theoretical predictions, strain-stiffening modeled via the Gent constitutive relation [Jin and Suo, JMPS, 2015, 74, 68-79] is found to govern both crease onset and crease density. Specifically, crease onset matches prediction using only experimentally-measured parameters. Neo-Hookean solids are found to prefer initiating creasing with many short creases that join to form a collapsed state with only a few creases, whereas creasing in Gent solids initiates with a few creases that propagate across the cavity surface. These experimental observations are explained by energy minimization using finite element simulation of a cylindrical crease geometry.

Original languageEnglish (US)
Pages (from-to)6894-6904
Number of pages11
JournalSoft Matter
Volume13
Issue number38
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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