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Yield stress and thixotropy: on the difficulty of measuring yield stresses in practice
Soft Matter, 2006The 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
Peder Moller +3 more
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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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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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Coiling of yield stress fluids
Physical Review E, 2011We present an experimental investigation of the coiling of a filament of a yield stress fluid falling on a solid surface. We use two kinds of yield stress fluids, shaving foam and hair gel, and show that the coiling of the foam is similar to the coiling of an elastic rope.
Daniel Bonn +4 more
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Yield Stress Fluids Slowly Yield to Analysis
Science, 2009The behavior of a type of complex fluid (exemplified by mayonnaise and concrete) can depend on the sample's flow history.
Morton M. Denn, Daniel Bonn
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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 ...
Howard A. Barnes, Kenneth Walters
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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 ...
Howard A. Barnes, Kenneth Walters
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Journal of Non-Newtonian Fluid Mechanics, 2018
Abstract Yield stress materials are known to possess a certain threshold property, a strength , that must be overcome in order for flow to occur. This strength is commonly conceived as a scalar representation of the stress tensor at the yielding point, here called the yield stress tensor .
Roney L. Thompson +2 more
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Abstract Yield stress materials are known to possess a certain threshold property, a strength , that must be overcome in order for flow to occur. This strength is commonly conceived as a scalar representation of the stress tensor at the yielding point, here called the yield stress tensor .
Roney L. Thompson +2 more
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On the yield stress of nanocrystals
Journal of Materials Science, 1993A generalization of the Hall-Petch relationship is proposed. The generalized relationship takes account of the contributions from intergrain sliding, generation of lattice dislocations, and influence of disclination-like defects. From this approach, a critical size corresponding to a maximum of the Hall-Petch size dependence is obtained.
V. G. Gryaznov +3 more
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Stress stability at the yield surface
International Journal of Non-Linear Mechanics, 1995Abstract An elastic-plastic material may be unstable at yield under work control, if the values of its free energy at yield are not properly restricted. This is true whether the material is stable in Drucker's sense or not. In materials in which plastic volume change is unrestricted, stability under work control requires that the yield surface should
A. PAGLIETTI, PORCU, MARIA CRISTINA
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Yield Stress of Multimodal Powder Suspensions: An Extension of the YODEL (Yield Stress mODEL)
Journal of the American Ceramic Society, 2007The prediction of the rheological properties of concentrated suspensions is of great importance both in industrial processes (ceramics, cements, and pharmaceutics) and natural phenomena (debris flow, soil erosion). In a previous paper, we presented a new model (YODEL) that can predict the yield stress of concentrated particulate suspensions.
Flatt, Robert J., Bowen, Paul
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Wicking with a yield stress fluid
Journal of Physics: Condensed Matter, 2008This 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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