The yield normal stress

Cagny, Henri de; Fazilati, Mina; Habibi, Mehdi; Denn, Morton M.; Bonn, Daniel

doi:10.1122/1.5063796

Cited by 53 publications

(52 citation statements)

References 32 publications

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“…They found the ratio of the yield stress measured in uniaxial elongation to its value measured in shear flow to be greater, by a factor of 1.5, than the value predicted by the ideal viscoplastic theory. Moreover, de Cagny et al (7) combined steady and oscillatory measurements of normal stresses in shear flows of EVP materials. They found that the first normal stress difference developed in shear flow is positive, that the second normal stress difference is negative, and that both are comparable in magnitude to the shear stress.…”

mentioning

confidence: 99%

Transition between solid and liquid state of yield-stress fluids under purely extensional deformations

Varchanis

Haward

Hopkins

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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We report experimental microfluidic measurements and theoretical modeling of elastoviscoplastic materials under steady, planar elongation. Employing a theory that allows the solid state to deform, we predict the yielding and flow dynamics of such complex materials in pure extensional flows. We find a significant deviation of the ratio of the elongational to the shear yield stress from the standard value predicted by ideal viscoplastic theory, which is attributed to the normal stresses that develop in the solid state prior to yielding. Our results show that the yield strain of the material governs the transition dynamics from the solid state to the liquid state. Finally, given the difficulties of quantifying the stress field in such materials under elongational flow conditions, we identify a simple scaling law that enables the determination of the elongational yield stress from experimentally measured velocity fields.

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mentioning

confidence: 99%

Transition between solid and liquid state of yield-stress fluids under purely extensional deformations

Varchanis

Haward

Hopkins

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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“…The behaviour of the first normal stress difference, N 1 , (Fig. 3a, inset) is different from that expected of fibrillar dispersions, for which N 1 would typically increase with γ̇ due to fibrous aggregates becoming elongated in the direction of the applied shear [52][53][54] . Here, N 1 decreased with γ̇ (for γ̇ > ~ 0.05 s -1 ), indicating that the aggregates became shorter in the direction of the applied shear.…”

Section: Solventmentioning

confidence: 72%

Fracto-eutectogels: SDS fractal dendrites via counterion condensation in a deep eutectic solvent

Matthews

Ruscigno

Rogers

et al. 2021

Phys. Chem. Chem. Phys.

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“…In the present study, the normal yield stress [25] and the yield stress tensor [26] were approximated by measuring only the static shear yield stress ( ). We then assumed that the measured was close to normal yield stress.…”

Section: Rheological Characterisation Of Silicone Elastomer Formulationsmentioning

confidence: 99%

FingerMap: a new approach to predict soft material 3D objects printability

2020

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Soft material 3D printing through Liquid Deposition Modelling (LDM) is a challenging manufacturing process where yield stress control is mandatory. Indeed, the higher the yield stress value, the more complex the 3D printed structure can be. In a bid to go one step further, this report proposes a new approach enabling the prediction of soft material 3D printability as a function of the material's properties and shape. The prediction consists in numerical simulation to anticipate, in silico, the collapse of a voxelized 3D design, called FingerMap. To do so, a calibration of the program using three silicone formulations (with increasing yield stress value) was first performed to define a printability domain according to mass/surface ratio, overhang angle and the zposition of each voxel. Then, two anatomical 3D models (ear and aortic valve) were used to demonstrate the capacity of the tool to predict printability. Good correlations between theoretical and experimental results were obtained. The proposed in silico simulation tool was then proven to be useful for LDM, even if some limitations were identified, particularly in the case of materials exhibiting complex rheological behaviours such as time-dependent rheological properties.

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The yield normal stress

Cited by 53 publications

References 32 publications

Transition between solid and liquid state of yield-stress fluids under purely extensional deformations

Transition between solid and liquid state of yield-stress fluids under purely extensional deformations

Fracto-eutectogels: SDS fractal dendrites via counterion condensation in a deep eutectic solvent

FingerMap: a new approach to predict soft material 3D objects printability

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