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 time scales 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 design applications.
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September 2022
Research Article|
September 01 2022
Thixotropic spectra and Ashby-style charts for thixotropy
Samya Sen
;
Samya Sen
1
Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign
, Urbana, Illinois
61801, USA
2Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
3Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, USA
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Randy H. Ewoldt
Randy H. Ewoldt
a)
1
Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign
, Urbana, Illinois
61801, USA
2Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
3Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, USA
4Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
a)Author to whom correspondence should be addressed; electronic mail: [email protected]
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a)Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 66, 1041–1053 (2022)
Article history
Received:
January 25 2022
Accepted:
July 17 2022
Citation
Samya Sen, Randy H. Ewoldt; Thixotropic spectra and Ashby-style charts for thixotropy. J. Rheol. 1 September 2022; 66 (5): 1041–1053. https://doi.org/10.1122/8.0000446
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