Mode-coupling analysis of residual stresses in colloidal glasses

Fritschi, Sebastian; Fuchs, Matthias; Voigtmann, Thomas

doi:10.1039/c4sm00247d

Cited by 17 publications

(11 citation statements)

References 54 publications

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“…3 are marked with the dashed lines. Both systems, permeable and impermeable, show a decrease in relaxation time with increasing Pe, which is in accordance with the work of Mohan et al [23,35] and Fritschi et al [54]. However, at a given Pe, permeable particles are found to relax on shorter time scales than impermeable particles of the same elastic modulus, particularly for systems with low S * .…”

Section: Stress Relaxationsupporting

confidence: 90%

Stress relaxation of dense spongy-particle systems

Zakhari

Hütter

Anderson

2018

Journal of Rheology

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Section: Stress Relaxationsupporting

confidence: 90%

Stress relaxation of dense spongy-particle systems

Zakhari

Hütter

Anderson

2018

Journal of Rheology

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“…In the glass, MCT describes temporal memory that can stretch back arbitrarily far in time, and as a result, stresses do not relax to zero, but to a finite residual-stress value that depends on the initial flow rate. These residual stresses have been confirmed in molecular-dynamics and BD simulations and different experiments on various colloidal hard-sphere-like systems [112,113]. Phenomenologically, residual stresses are known to exist in quenched glasses; they are exploited technologically to tune the macroscopic mechanical performance of materials produced from the melt, e.g., in safety glasses.…”

Section: Cessation Dynamicsmentioning

confidence: 67%

“…Upper panels: stress relaxation after cessation of shear flow from the nonequilibrium stationary state at a shear-rateγ switched off at t = 0 (adapted from Ref [112]…”

mentioning

confidence: 99%

Nonlinear mechanical response of supercooled melts under applied forces

Cárdenas

Frahsa

Fritschi

et al. 2017

Eur. Phys. J. Spec. Top.

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We review recent progress on a microscopic theoretical approach to describe the nonlinear response of glass-forming colloidal dispersions under strong external forcing leading to homogeneous and inhomogeneous flow. Using mode-coupling theory (MCT), constitutive equations for the rheology of viscoelastic shear-thinning fluids are obtained. These are, in suitably simplified form, employed in continuum fluid dynamics, solved by a hybrid-Lattice Boltzmann (LB) algorithm that was developed to deal with long-lasting memory effects. The combined microscopic theoretical and mesoscopic numerical approach captures a number of phenomena far from equilibrium, including the yielding of metastable states, process-dependent mechanical properties, and inhomogeneous pressure-driven channel flow.

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“…This is not surprising because the model was initially devised as a rheological model to study the interplay of aging dynamics and shear flow in glassy materials (Fielding et al, 2000;Sollich, 1998). By contrast, the mode-coupling approach developed in (Fuchs and Cates, 2009) does not include aging effects, and so it cannot describe the slow relaxation of the stress after flow cessation or the subdiffusive particle displacements observed in experiments (Ballauff et al, 2013;Fritschi et al, 2014), and predicts instead a fast convergence to an arrested state with a finite residual stress.…”

Section: (B)mentioning

confidence: 99%

Yield stress materials in soft condensed matter

et al. 2017

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We present a comprehensive review of the physical behavior of yield stress materials in soft condensed matter, which encompass a broad range of materials from colloidal assemblies and gels to emulsions and non-Brownian suspensions. All these disordered materials display a nonlinear flow behavior in response to external mechanical forces, due to the existence of a finite force threshold for flow to occur: the yield stress. We discuss both the physical origin and rheological consequences associated with this nonlinear behavior, and give an overview of experimental techniques available to measure the yield stress. We discuss recent progress concerning a microscopic theoretical description of the flow dynamics of yield stress materials, emphasizing in particular the role played by relaxation time scales, the interplay between shear flow and aging behavior, the existence of inhomogeneous shear flows and shear bands, wall slip, and non-local effects in confined geometries.

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Mode-coupling analysis of residual stresses in colloidal glasses

Cited by 17 publications

References 54 publications

Stress relaxation of dense spongy-particle systems

Stress relaxation of dense spongy-particle systems

Nonlinear mechanical response of supercooled melts under applied forces

Yield stress materials in soft condensed matter

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