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Thixotropic spectra and Ashby-style charts for thixotropy

Journal Article · · Journal of Rheology
DOI:https://doi.org/10.1122/8.0000446· OSTI ID:1982940
 [1];  [2]
  1. Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA; Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, USA
  2. Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA; Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, USA; Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1982940
Journal Information:
Journal of Rheology, Vol. 66, Issue 5; ISSN 0148-6055
Publisher:
Society of Rheology
Country of Publication:
United States
Language:
English

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