The yield normal stress

Henri De Cagny, Mina Fazilati, Mehdi Habibi, Morton M. Denn, Daniel Bonn

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Normal stresses in complex fluids lead to new flow phenomena because they can be comparable to, or even larger than, the shear stress. In addition, they are of paramount importance for formulating and testing constitutive equations for predicting nonviscometric flow behavior. Very little attention has thus far been paid to the normal stresses of yield stress fluids, which are difficult to measure. We report the first systematic study of the first and second normal stress differences in both continuous and slow oscillatory shear of three model nonthixotropic yield stress fluids, with N 1 > 0 and N 2 < 0. We show that both normal stress differences are quadratic functions of the shear stress both above and below the shear yield stress, leading to the existence of a yield normal stress. However, the contribution of the normal stresses to the von Mises yield criterion for these materials is small.

LanguageEnglish
Pages285-290
Number of pages6
JournalJournal of Rheology
Volume63
Issue number2
DOIs
Publication statusPublished - 1 Mar 2019

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Yield stress
Fluids
Shear stress
shear stress
fluids
Constitutive equations
shear
constitutive equations
Testing

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De Cagny, H., Fazilati, M., Habibi, M., Denn, M. M., & Bonn, D. (2019). The yield normal stress. Journal of Rheology, 63(2), 285-290. https://doi.org/10.1122/1.5063796
De Cagny, Henri ; Fazilati, Mina ; Habibi, Mehdi ; Denn, Morton M. ; Bonn, Daniel. / The yield normal stress. In: Journal of Rheology. 2019 ; Vol. 63, No. 2. pp. 285-290.
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De Cagny, H, Fazilati, M, Habibi, M, Denn, MM & Bonn, D 2019, 'The yield normal stress', Journal of Rheology, vol. 63, no. 2, pp. 285-290. https://doi.org/10.1122/1.5063796

The yield normal stress. / De Cagny, Henri; Fazilati, Mina; Habibi, Mehdi; Denn, Morton M.; Bonn, Daniel.

In: Journal of Rheology, Vol. 63, No. 2, 01.03.2019, p. 285-290.

Research output: Contribution to journalArticleAcademicpeer-review

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De Cagny H, Fazilati M, Habibi M, Denn MM, Bonn D. The yield normal stress. Journal of Rheology. 2019 Mar 1;63(2):285-290. https://doi.org/10.1122/1.5063796