Understanding the transient large amplitude oscillatory shear behavior of yield stress fluids
Understanding the transient large amplitude oscillatory shear behavior of yield stress fluids
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DOI：
10.1122/8.0000583
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发表时间：
2023-03
影响因子：
3.3
通讯作者：
Krutarth M. Kamani;G. Donley;R. Rao;Anne M. Grillet;C. Roberts;A. Shetty;S. Rogers
中科院分区：
文献类型：
--
作者：
Krutarth M. Kamani;G. Donley;R. Rao;Anne M. Grillet;C. Roberts;A. Shetty;S. Rogers
利用多种实验和分析方法，充分了解大振幅振荡剪切下屈服应力流体所表现出的过程序列。一种新的组件率Lissajous曲线，其中应变不可恢复和可恢复的收购率绘制对彼此，介绍和其实用程序证明了四个简单的粘弹性模型的分析响应的应用。使用组件率空间，屈服和不屈服的方式获得应变的变化，从可恢复到不可恢复，并再次确定。的行为进行了研究，通过比较实验结果与预测的弹性宾汉模型，该模型是使用Oldrophil-Prager形式主义和最近提出的连续模型Kamani，Donley，和罗杰斯，其中屈服增强快速收购的弹性应变。从瞬态大振幅振荡剪切（LAOS）数据获得的物理解释进行比较，从分析序列的物理过程框架和一个新的时间分辨Pipkin空间的结果。因此，组成部分的比率数字提供了一个独立的测试的解释顺序的物理过程分析，也可以应用到其他LAOS分析框架。这些方法中的每一种，组分速率，物理过程分析的顺序，以及时间分辨的Pipkin图，明确地识别相同的材料物理学，表明屈服应力流体经历一系列物理过程，包括弹性变形，逐渐屈服，塑性流动和逐渐不屈服。
A full understanding of the sequence of processes exhibited by yield stress fluids under large amplitude oscillatory shearing is developed using multiple experimental and analytical approaches. A novel component rate Lissajous curve, where the rates at which strain is acquired unrecoverably and recoverably are plotted against each other, is introduced and its utility is demonstrated by application to the analytical responses of four simple viscoelastic models. Using the component rate space, yielding and unyielding are identified by changes in the way strain is acquired, from recoverably to unrecoverably and back again. The behaviors are investigated by comparing the experimental results with predictions from the elastic Bingham model that is constructed using the Oldroyd–Prager formalism and the recently proposed continuous model by Kamani, Donley, and Rogers in which yielding is enhanced by rapid acquisition of elastic strain. The physical interpretation gained from the transient large amplitude oscillatory shear (LAOS) data is compared to the results from the analytical sequence of physical processes framework and a novel time-resolved Pipkin space. The component rate figures, therefore, provide an independent test of the interpretations of the sequence of physical processes analysis that can also be applied to other LAOS analysis frameworks. Each of these methods, the component rates, the sequence of physical processes analysis, and the time-resolved Pipkin diagrams, unambigiously identifies the same material physics, showing that yield stress fluids go through a sequence of physical processes that includes elastic deformation, gradual yielding, plastic flow, and gradual unyielding.