Distinguishing thixotropy from viscoelasticity

粘弹性 触变性 流变学 材料科学 蠕动 应力松弛 放松(心理学) 机械 流变仪 动态模量 动态力学分析 复合材料 聚合物 物理 心理学 社会心理学
作者
Mayank Mohan Agarwal,Saroj Sharma,V. Shankar,Yogesh M. Joshi
出处
期刊:Journal of Rheology [American Institute of Physics]
卷期号:65 (4): 663-680 被引量:23
标识
DOI:10.1122/8.0000262
摘要

Owing to nonlinear viscoelasticity, materials often show characteristic features that resemble those of thixotropy. This issue has been debated in the literature over the past several decades, and several experimental protocols have been proposed to distinguish thixotropy from viscoelasticity. In this work, we assess these protocols by carrying out experiments using polymer solutions, thixotropic clay dispersions, and modeling their behavior, respectively, using the finitely extensible nonlinear elastic—Peterlin (FENE-P) constitutive equation and a viscoelastic aging model. We find that the criteria proposed in the literature, such as a step-down jump in the shear rate and shear start-up at different waiting times elapsed since preshear, are inadequate to distinguish thixotropy from viscoelasticity. In marked contrast, we show that the application of step-strain or step-stress after cessation of the preshear serves as a useful discriminant between thixotropy and viscoelasticity. In thixotropic materials, we observe that the application of step strain (or step stress) after cessation of the preshear eventually leads to slowing down of relaxation dynamics as a function of waiting time. However, for viscoelastic materials, the relaxation modulus (creep compliance) curve shifts to lower modulus (higher compliance) values as a function of waiting time until equilibrium is reached. While the proposed criterion offers a robust distinction between viscoelasticity and thixotropy for the systems studied here, further experimental investigations based on other systems are needed to establish its versatility and will lead to a greater insight into this long-standing issue in rheological categorization.
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