Thixotropic spectra and Ashby-style charts for thixotropy
Samya Sen, Randy H. Ewoldt

TL;DR
This paper introduces a universal, model-insensitive framework using thixotropic spectra and Ashby-style charts to compare and visualize thixotropic properties across different fluids and microstructures.
Contribution
It presents a novel generalized framework based on thixotropic spectra for comparing thixotropic effects, independent of specific models, and visualizes properties using Ashby-style diagrams.
Findings
Effective characterization of thixotropic timescales and mode strengths.
Visualization of average thixotropic properties on Ashby-style diagrams.
Framework applicable to diverse microstructures and experimental data.
Abstract
There is no universal model for thixotropy, and comparing thixotropic effects between different fluids is a subtle yet challenging problem. We introduce a generalized (model-insensitive) framework for comparing thixotropic properties based on thixotropic spectra. A superposition of exponential stress modes distributed over thixotropic timescales is used to quantify buildup and breakdown times and mode strengths in response to step-change input. This mathematical framework is tested with several experimental step-shear rate data on colloidal suspensions. Low-dimensional metrics based on moments of the distribution reveal characteristic average thixotropic properties which are visualized on Ashby-style diagrams. This method outlines a framework for describing thixotropy across a diverse range of microstructures, supporting scientific studies as well as material selection for engineering…
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Taxonomy
TopicsRheology and Fluid Dynamics Studies · Material Dynamics and Properties · Theoretical and Computational Physics
