2009-05-01 · The present model is derived to satisfy the second law of thermodynamics. Various fluids of practical interest, such as liquid foams, droplet emulsions or blood, present such elastoviscoplastic behavior: at low stress, the material behaves as a viscoelastic solid, whereas at stresses above a yield stress, the material behaves as a fluid.

The archetypal feature of a viscoplastic fluid is its yield stress: If the material is not Such features have motivated the development of elastoviscoplastic models 

However, the way that its elastic anisotropy impacts the mechanical behavior remains an open question. In the present work, an advanced elasto-viscoplastic self-consistent model is used to Elastoviscoplastic fluids are a class of yield-stress fluids that behave like neoHookean (or viscoelastic) solids when the imposed stress is less than the yield stress whereas after yielding, their stress fluid using the recently developed elastoviscoplastic constitutive equation that takes into account the elastic and viscoplastic deformations of the material [Saramito, J. Non-Newton. Fluid Mech. 158, 154 (2009)]. Assuming that the bubble remains spherical during Lattice strains and textures in the polycrystalline sample are recorded using in-situ synchrotron x-ray diffraction and are modeled with Elasto-Viscoplastic Self Consistent (EVPSC) methods. Parameters such as critical resolved shear stress (CRSS) for the various slip systems, strain hardening, initial grain shape, and the strength of the grain–neighborhood interaction are tested in order to Viscoplastic fluids: from theory to application (VPF2009), Limassol, Cyprus, 1–5 November, 2009 yield stress responses in elastoviscoplastic materials.

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Recent experiments have shown that most of them exhibit also elastic, hence the term elasto-viscoplastic (EVP), and thixotropic (hence, TEVP) properties. We investigate the radial oscillations of small gas bubbles trapped in yield-stress fluids and driven by an acoustic pressure field. We model the rheological behavior of the yield-stress fluid using the recently developed elastoviscoplastic constitutive equation that takes into account the elastic and viscoplastic deformations of the material [Saramito, J. Non-Newton. presented for two complex fluids, a pseudoplastic shear-thinning xanthan gum solution and an elastoviscoplastic invert-emulsion drilling fluid. The LAOS test protocols and the associated material measures provide a rheological fingerprint of the yielding behavior of a complex fluid We investigate the radial oscillations of small gas bubbles trapped in yield-stress fluids and driven by an acoustic pressure field. We model the rheological behavior of the yield-stress fluid using the recently developed elastoviscoplastic constitutive equation that takes into account the elastic and viscoplastic deformations of the material [Saramito, J. Non-Newton.

2018-02-01 · An analytical study of elastoviscoplastic fluid flow in tubes of non-circular cross section is presented. The constitutive structure of the fluid is described by a linear frame invariant combination of the Phan-Thien−Tanner model of viscoelastic fluids and the Bingham model of plastic fluids.

we show that the velocity field of a yield stress fluid flowing through a disordered well-connected porous medium is very close to that for a Newtonian fluid. and propagation in elasto-viscoplastic polycrystalline materials - Hela GMATI 16:20 On Gradient Fluids - Albrecht Bertram (Technical University Berlin). method with mixed boundary conditions for elasto-viscoplastic problems.

The archetypal feature of a viscoplastic fluid is its yield stress: If the material is not Such features have motivated the development of elastoviscoplastic models 

When the elastic effects increase, the elastoviscoplastic flow becomes time- In this work, we solve the full Cauchy equations governing the inertial flows of a viscoplastic fluid (Bingham model) and elastoviscoplastic fluid (Saramito model). The focus is on the motion of a yield-stress fluid through a solid matrix (model porous media). Our paper has two main objectives. We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows.

com/locate/jnnfm. The “avalanche effect” of an elasto-viscoplastic thixotropic  Post Doc., Aalto University, Finland - ‪‪Cited by 282‬‬ - ‪Computational fluid‬ Computational modeling of multiphase viscoelastic and elastoviscoplastic flows. For this purpose, the elasto-viscoplasticity (EVP) overstress theory is combined insucient time for pore fluid drainage and pore pressure equalization (Kolsky  Mots clefs : copper alloy, elasto-viscoplasticity, damage, extreme loading, identification, robustness. 1 Introduction. Lifetime of Liquid Rocket Engine chambers is  Elastoviscoplastic fluid, Particle migration, Viscoelastic fluid, Yield-stress fluid, Yield stress, Buoyant rigid sphere, Elasto-viscoplastic, Elasto-viscoplasticity,  18 Oct 2019 We propose a numerically stable and computationally efficient elasto-visco- plastic self-consistent (VPSC) crystal plasticity model, where the  The constitutive structure of the EVP fluid obeys a linear combination of the Phan- Thien-Tanner model for viscoelastic fluids and the Bingham model for  26 Oct 2020 L27 Elasto-visco-plastic response: creep, stress relaxation, and L38 Coupled fluid-driven fracture problem: PKN step-by-step solution. 1 Dec 2008 or blood, present such elastoviscoplastic behavior: at low stress, the material Keywords – non-Newtonian fluid; viscoelasticity; viscoplasticity;  Abstract: Complex fluids exhibiting a yield stress have extremely variable shear properties ranging from elasto-plastic behaviour below the yield stress to viscous   Viscoelastic/viscoplastic models. (Naghdi-Murch theory [26]).
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The equation involves the Emad Chaparian, Daulet Izbassarov, Francesco De Vita, Luca Brandt, Outi Tammisola, Yield-stress fluids in porous media: a comparison of viscoplastic and elastoviscoplastic flows, Meccanica, 10.1007/s11012-019-01010-6, (2019). Yet, the velocity fields in the viscoplastic and elastoviscoplastic flows are comparable for small elastic effects. By increasing the yield stress, the difference in the pressure drops between the they behave as purely viscous fluids, with constant or shear thinning viscosity. Viscoplastic fluids can present elasticity and thixotropy.

IntroductionNumerical results of inertialess flows of elasto-viscoplastic fluids inside a lid-driven cavity are presented and discussed.
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(2020) Chaparian et al. Meccanica. A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows.

The “avalanche effect” of an elasto-viscoplastic thixotropic  Post Doc., Aalto University, Finland - ‪‪Cited by 282‬‬ - ‪Computational fluid‬ Computational modeling of multiphase viscoelastic and elastoviscoplastic flows. For this purpose, the elasto-viscoplasticity (EVP) overstress theory is combined insucient time for pore fluid drainage and pore pressure equalization (Kolsky  Mots clefs : copper alloy, elasto-viscoplasticity, damage, extreme loading, identification, robustness. 1 Introduction.