General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity
This work contributes to general theoretical aspects of yield stress fluids with significance for practical phenomenological material modeling. It introduces a terminology so that the material class ‘yield stress fluid’ is defined and can be distinguished from the terms ‘solid’ and ‘liquid’. This ne...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2014-02-01
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| Series: | Applied Rheology |
| Subjects: | |
| Online Access: | https://doi.org/10.3933/applrheol-24-14578 |
| _version_ | 1819020219573600256 |
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| author | Boisly Martin Kästner Markus Brummund Jörg Ulbricht Volker |
| author_facet | Boisly Martin Kästner Markus Brummund Jörg Ulbricht Volker |
| author_sort | Boisly Martin |
| collection | DOAJ |
| description | This work contributes to general theoretical aspects of yield stress fluids with significance for practical phenomenological material modeling. It introduces a terminology so that the material class ‘yield stress fluid’ is defined and can be distinguished from the terms ‘solid’ and ‘liquid’. This new material classification is based on two criteria, the equilibrium relation and the flow function. In line with this terminology, an experimental procedure for classifying the material behavior is presented. The second key aspect of this paper is a discussion on the proper definition of the term ‘viscosity’. The benefit of the differential viscosity over the dynamic viscosity in case of non-Newtonian fluids in general is worked out. This is shown by the most elementary yield stress fluid, the friction element, because it is the basis of the yield stress concept. Its constitutive equations are given for positive as well as negative strain rates and are also able to represent the preyield behavior. The theory presented in this article is also applied to the Maxwell, Kelvin-Voigt, and Bingham element to demonstrate the working principle. |
| first_indexed | 2024-12-21T03:47:44Z |
| format | Article |
| id | doaj.art-d7ce0978c6fd41c4b48d9854d70c95f6 |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-12-21T03:47:44Z |
| publishDate | 2014-02-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-d7ce0978c6fd41c4b48d9854d70c95f62022-12-21T19:17:03ZengDe GruyterApplied Rheology1617-81062014-02-01241263610.3933/applrheol-24-14578General Aspects of Yield Stress Fluids – Terminology and Definition of ViscosityBoisly Martin0Kästner Markus1Brummund Jörg2Ulbricht Volker3Institute of Solid Mechanics, Technische Universität Dresden, George-Bähr-Str. 3c,Dresden, GemanyInstitute of Solid Mechanics, Technische Universität Dresden, George-Bähr-Str. 3c,Dresden, GemanyInstitute of Solid Mechanics, Technische Universität Dresden, George-Bähr-Str. 3c,Dresden, GemanyInstitute of Solid Mechanics, Technische Universität Dresden, George-Bähr-Str. 3c,Dresden, GemanyThis work contributes to general theoretical aspects of yield stress fluids with significance for practical phenomenological material modeling. It introduces a terminology so that the material class ‘yield stress fluid’ is defined and can be distinguished from the terms ‘solid’ and ‘liquid’. This new material classification is based on two criteria, the equilibrium relation and the flow function. In line with this terminology, an experimental procedure for classifying the material behavior is presented. The second key aspect of this paper is a discussion on the proper definition of the term ‘viscosity’. The benefit of the differential viscosity over the dynamic viscosity in case of non-Newtonian fluids in general is worked out. This is shown by the most elementary yield stress fluid, the friction element, because it is the basis of the yield stress concept. Its constitutive equations are given for positive as well as negative strain rates and are also able to represent the preyield behavior. The theory presented in this article is also applied to the Maxwell, Kelvin-Voigt, and Bingham element to demonstrate the working principle.https://doi.org/10.3933/applrheol-24-14578yield stress fluiddifferential viscosityapparent viscosityequilibrium stressfriction elementbingham element |
| spellingShingle | Boisly Martin Kästner Markus Brummund Jörg Ulbricht Volker General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity Applied Rheology yield stress fluid differential viscosity apparent viscosity equilibrium stress friction element bingham element |
| title | General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity |
| title_full | General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity |
| title_fullStr | General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity |
| title_full_unstemmed | General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity |
| title_short | General Aspects of Yield Stress Fluids – Terminology and Definition of Viscosity |
| title_sort | general aspects of yield stress fluids terminology and definition of viscosity |
| topic | yield stress fluid differential viscosity apparent viscosity equilibrium stress friction element bingham element |
| url | https://doi.org/10.3933/applrheol-24-14578 |
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