Evidence for Chaotic Behavior during the Yielding of a Soft Particle Glass,Physical Review Letters

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Evidence for Chaotic Behavior during the Yielding of a Soft Particle Glass
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-04 , DOI: 10.1103/physrevlett.129.068002
David C Venerus ₁ , Otar Machabeli ₁ , Daniela Bushiri ₁ , Seyed Mahmoud Arzideh ₁

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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.

中文翻译：

软颗粒玻璃屈服过程中混沌行为的证据

由可变形颗粒（如微凝胶、浓缩乳液和泡沫）组成的材料表现出复杂的流变行为，包括从弹性固体到粘性流体的屈服转变。大多数这类软物质的研究都涉及剪切流，只有少数报告了剪切应力和正应力。我们提出了对经受恒定剪切速率流动的微凝胶的剪切应力和两个法向应力差的测量。剪切应力以指示简单屈服应力流体行为的方式通过屈服点演变。在屈服之前，法向应力差异是无法测量的；超出屈服点，它们以可重复的混乱方式进化。

更新日期：2022-08-04

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