2017
DOI: 10.1007/s00397-017-1055-7
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Slow flows of yield stress fluids: yielding liquids or flowing solids?

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Cited by 45 publications
(27 citation statements)
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“…Initially, shear stress increases with shear rate up to around 10 −3 s −1 , and shear stresses ranged from 500 Pa, for the lithium grease, to 1000 Pa, for the polyurea-based grease, which was only measurable in the CS mode. Then, the flow curves for the aluminum complex, lithium complex, and simple lithium greases exhibit several decades of almost constant values of shear stress between 10 −3 and 10 s −1 , representative of the characteristic yielding flow behaviour of structured materials [6,10,27]. In addition, a slight non-monotonic evolution of the stress can be observed in this shear As typically found in commercial lubricating greases [25], all samples studied show values of the storage modulus (G') around one decade higher than those measured for the loss modulus (G"), as well as a minimum in G" at intermediate frequencies.…”
Section: Figurementioning
confidence: 96%
“…Initially, shear stress increases with shear rate up to around 10 −3 s −1 , and shear stresses ranged from 500 Pa, for the lithium grease, to 1000 Pa, for the polyurea-based grease, which was only measurable in the CS mode. Then, the flow curves for the aluminum complex, lithium complex, and simple lithium greases exhibit several decades of almost constant values of shear stress between 10 −3 and 10 s −1 , representative of the characteristic yielding flow behaviour of structured materials [6,10,27]. In addition, a slight non-monotonic evolution of the stress can be observed in this shear As typically found in commercial lubricating greases [25], all samples studied show values of the storage modulus (G') around one decade higher than those measured for the loss modulus (G"), as well as a minimum in G" at intermediate frequencies.…”
Section: Figurementioning
confidence: 96%
“…Viscoplastic (VP) fluids are a class of materials whose distinctive property is that they flow as fluids if subjected to large enough stresses but behave as solids if the applied stress is below a critical value, termed the yield stress. Although solids can also undergo plastic deformation, viscoplastic fluids are characterised by reversibility of the structural changes caused during plastic flow once the flow ceases [1,2]. The class of VP fluids includes a variety of materials such as foams, emulsions, colloids and physical gels, with possibly different microscopic mechanisms being responsible for the emergence of a yield stress in each case [3].…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, in the common form (1) of the HB equation, τ identifies with σ d of Eq. (2). However, from a constitutive equation for a fluid one expects a decomposition of σ into the extra-stress tensor (for which the symbol τ is usually reserved) which expresses the forces that arise due to deformation of the fluid, and an isotropic pressure component which is responsible for enforcing continuity in incompressible fluids:…”
Section: Introductionmentioning
confidence: 99%
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“…This value may be generally interpreted as a shear stress threshold for the breakage of interparticle connectivity. 2 Furthermore, as it initiates motion in the system, it is connected to mechanical inertia 3 and particle settling, i.e. it is a terse summary of buoyancy, dynamic pressure, weight, viscous and yield stress resistances.…”
mentioning
confidence: 99%