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Title: Yield stress and thixotropy: on the difficulty of measuring yield stresses in practice
Authors: Moller, PCF ×
Mewis, Joannes
Bonn, D #
Issue Date: Apr-2006
Publisher: Royal soc chemistry
Series Title: Soft matter vol:2 issue:4 pages:274-283
Abstract: The yield stress of many yield stress fluids has turned out to be difficult to determine experimentally. This has led to various discussions in the literature about those experimental difficulties, and the usefulness and pertinence of the concept of yield stress fluids. We argue here that most of the difficulties disappear when taking the thixotropy of yield stress fluids into account, and will demonstrate an experimental protocol that allows reproducible data to be obtained for the critical stress necessary for flow of these fluids. As a bonus, we will show that the interplay of yield stress and thixotropy allows one to account for the ubiquitous shear localization observed in these materials. However, due to the thixotropy the yield stress is no longer a material property, since it depends on the (shear) history of the sample.
URI: 
ISSN: 1744-683X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Chemical Engineering - miscellaneous
× corresponding author
# (joint) last author

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