Results 331 to 340 of about 8,550,318 (390)

YIELD STRESS IN FERROFLUIDS?

Electrorheological Fluids and Magnetorheological Suspensions, 2007
Recent experimental as well as theoretical investigations have shown that the formation of structures of magnetic nanoparticles has significant influence on the behaviour of ferrofluids. The dependence of this structure formation on the magnetic field strength and shear stress applied to the fluid leads to strong changes of the viscosity and to the ...
HAMID SHAHNAZIAN, STEFAN ODENBACH
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Yield stress and thixotropy: on the difficulty of measuring yield stresses in practice

Soft Matter, 2006
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
Moller, P.C.F., Mewis, J., Bonn, D.
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The yield stress myth?

Rheologica Acta, 1985
New experimental data obtained from constant stress rheometers are used to show that the yield stress concept is an idealization, and that, given accurate measurements, no yield stress exists. The simple Cross model is shown to be a useful empiricism for many non-Newtonian fluids, including those which have hitherto been thought to possess a yield ...
H. A. Barnes, K. Walters
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Compaction Induced Yield Stress

Geotechnical and Geological Engineering, 2013
In order to realize more benefits and to have more effective output from the mechanical ground improvement projects, the field soils are subjected to over consolidation. This process induces a characteristic yield stress in the compacted soil mass similar to that exhibited by the soil masses subjected to natural processes of over consolidation during ...
K. Prakash, A. Sridharan, H. S. Prasanna
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Blood yield stress in systemic sclerosis

American Journal of Physiology-Heart and Circulatory Physiology, 1999
Blood is a weak percolating physical gel at low shear rates, in which clusters of aggregates can be reversibly disaggregated or formed again. This phenomenon is of potential importance in the microvascular pathophysiology of ischemic and vasospastic disorders such as systemic sclerosis. The aim of this work was to determine blood yield stress using low-
C, Picart, P H, Carpentier, H, Galliard, J M, Piau   +3 more
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Stress stability at the yield surface

International Journal of Non-Linear Mechanics, 1995
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
A. PAGLIETTI, PORCU, MARIA CRISTINA
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Relation Between Yield Stress and Peierls Stress

physica status solidi (b), 2019
It is often assumed that the Peierls stress of single dislocations can reflect accurately the macroscopic yield stress. Here, dislocation dynamics simulations show that the yield stress‐to‐Peierls stress (Y/P) ratio remains within a small range of ≈0.3 ± 0.1, over a wide range of initial dislocation density, mobile dislocation fraction, and temperature
Kai Wing Siu, Alfonso Hing Wan Ngan
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Yield Stress Measurements

1990
Much has been written about the yield stress, specially in the field of blood rheology. The definition of the yield stress is very clear and says that this is the smallest load under which a substance will flow. Its measure is the yield stress value of the applied shear stress.
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Analysis of shear rheometry of yield stress materials and apparent yield stress materials

Rheologica Acta, 2002
For the most common types of viscometers the apparent flow curve of plastic fluids is studied. For torsional flow, where the shear rate is the natural variable, the apparent yield stress exceeds the true yield stress $$\tau _c $$ by more than 33%.
Peter Brunn, Hesham Asoud
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Wicking with a yield stress fluid

Journal of Physics: Condensed Matter, 2008
This work presents an experimental investigation of the flow of a model yield stress fluid (yield stresses between 5 and 21 Pa) driven by capillarity in horizontal glass tubes with diameters ranging from 0.46 to 1.5 mm. It is shown that the liquid penetration stops after typically a few centimeters. The results disagree with a simple model based on the
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