Evidence for Chaotic Behavior during the Yielding of a Soft Particle Glass

David C. Venerus, Otar Machabeli, Daniela Bushiri, Seyed Mahmoud Arzideh

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Materials comprised of deformable particles such as microgels and concentrated emulsions and foams display complex rheological behavior that includes a yielding transition from an elastic solid to viscous fluid. Most studies of this class of soft matter involve shear flows, and only a handful report both shear and normal stresses. We present measurements of the shear stress and two normal stress differences for a microgel subjected to constant shear rate flows. The shear stress evolves through the yield point in a manner indicative of simple yield stress fluid behavior. Prior to yielding, the normal stress differences are immeasurable; beyond the yield point, they evolve in a reproducibly chaotic manner.

Original languageEnglish (US)
Article number068002
JournalPhysical Review Letters
Issue number6
StatePublished - Aug 5 2022

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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