Details

Autor(en) / Beteiligte

• Sen, Samya
• Ewoldt, Randy H.

Titel

Thixotropic spectra and Ashby-style charts for thixotropy

Ist Teil von

• Journal of rheology (New York : 1978), 2022-09, Vol.66 (5)

Ort / Verlag

United States: Society of Rheology

Erscheinungsjahr

2022

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• 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.