scholarly journals Constraints on Transient Viscoelastic Rheology of the Asthenosphere From Seasonal Deformation

2018 ◽  
Vol 45 (5) ◽  
pp. 2328-2338 ◽  
Author(s):  
Kristel Chanard ◽  
Luce Fleitout ◽  
Eric Calais ◽  
Sylvain Barbot ◽  
Jean‐Philippe Avouac
Keyword(s):  
Viscoelastic Rheology

Linear and non-linear viscoelastic rheology of hybrid nanostructured materials from block copolymers with gold nanoparticles

2011 ◽  
Vol 50 (3) ◽  
pp. 257-275 ◽  
Author(s):  
Cesar Mendoza ◽  
Nabil Gindy ◽  
Manfred Wilhelm ◽  
Amir Fahmi
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Nanostructured Materials ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Viscoelastic Rheology

scholarly journals Junctional and cytoplasmic contributions in wound healing

2020 ◽  
Vol 17 (169) ◽  
pp. 20200264 ◽  
Author(s):  
Payman Mosaffa ◽  
Robert J. Tetley ◽  
Antonio Rodríguez-Ferran ◽  
Yanlan Mao ◽  
José J. Muñoz
Keyword(s):  
Wound Healing ◽  
Viscoelastic Properties ◽  
Healing Process ◽  
Wing Disc ◽  
Wound Healing Process ◽  
Minor Effect ◽  
Closure Rate ◽  
A Minor ◽  
Contractile Forces ◽  
Viscoelastic Rheology

Wound healing is characterized by the re-epitheliation of a tissue through the activation of contractile forces concentrated mainly at the wound edge. While the formation of an actin purse string has been identified as one of the main mechanisms, far less is known about the effects of the viscoelastic properties of the surrounding cells, and the different contribution of the junctional and cytoplasmic contractilities. In this paper, we simulate the wound healing process, resorting to a hybrid vertex model that includes cell boundary and cytoplasmic contractilities explicitly, together with a differentiated viscoelastic rheology based on an adaptive rest-length. From experimental measurements of the recoil and closure phases of wounds in the Drosophila wing disc epithelium, we fit tissue viscoelastic properties. We then analyse in terms of closure rate and energy requirements the contributions of junctional and cytoplasmic contractilities. Our results suggest that reduction of junctional stiffness rather than cytoplasmic stiffness has a more pronounced effect on shortening closure times, and that intercalation rate has a minor effect on the stored energy, but contributes significantly to shortening the healing duration, mostly in the later stages.

scholarly journals Complete spin and orbital evolution of close-in bodies using a Maxwell viscoelastic rheology

2016 ◽  
Vol 126 (1-3) ◽  
pp. 31-60 ◽  
Author(s):  
Gwenaël Boué ◽  
Alexandre C. M. Correia ◽  
Jacques Laskar
Keyword(s):  
Orbital Evolution ◽  
Viscoelastic Rheology

Linear Viscoelastic Rheology of Moderately Entangled Telechelic Polybutadiene Temporary Networks

2009 ◽  
Vol 42 (16) ◽  
pp. 6181-6192 ◽  
Author(s):  
Florian J. Stadler ◽  
Wim Pyckhout-Hintzen ◽  
Jean-Marc Schumers ◽  
Charles-André Fustin ◽  
Jean-François Gohy ◽  
...  
Keyword(s):  
Linear Viscoelastic ◽  
Viscoelastic Rheology

scholarly journals The motion of a deformable drop in a second-order fluid

1979 ◽  
Vol 92 (1) ◽  
pp. 131-170 ◽  
Author(s):  
P. C.-H. Chan ◽  
L. G. Leal
Keyword(s):  
Experimental Data ◽  
Shear Flow ◽  
Particle Velocity ◽  
Simple Shear ◽  
Poiseuille Flow ◽  
Second Order ◽  
Simple Shear Flow ◽  
Stream Migration ◽  
The Cross ◽  
Viscoelastic Rheology

The cross-stream migration of a deformable drop in a unidirectional shear flow of a second-order fluid is considered. Expressions for the particle velocity due to the separate effects of deformation and viscoelastic rheology are obtained. The direction and magnitude of migration are calculated for the particular cases of Poiseuille flow and simple shear flow and compared with experimental data.

Kelvin’s eigensystems in anisotropic poroelasticity

Geophysics ◽  
2009 ◽  
Vol 74 (5) ◽  
pp. WB97-WB105 ◽  
Author(s):  
Klaus Helbig ◽  
Patrick N. Rasolofosaon
Keyword(s):  
Porous Medium ◽  
Fluid Pressure ◽  
Complete Characterization ◽  
Fluid Content ◽  
Deformation State ◽  
Strain Components ◽  
Anisotropic Porous Medium ◽  
Mechanical Interpretation ◽  
Viscoelastic Rheology ◽  
Arbitrary Anisotropy

Correct interpretation and processing of seismic data must integrate a correct description of the mechanical behavior of rocks, taking into account facts such as the presence of anisotropy and porosity with or without a saturating fluid. This work discusses elasticity of porous media of arbitrary anisotropy type, with emphasis on the study of deformation states and the associated elastic constants. The stress-strain law is represented in seven dimensions. Dynamic parameters (i.e., the six stress components and fluid pressure) are linked with kinematical parameters (i.e., the six strain components and the local increase of fluid content) by a 7D poroelastic tensor. The model is based on the following mechanical interpretation: each eigenvector (eigenstrain) of the poroelastic tensor defines a fundamental deformation state of the medium and the seven eigenvalues (eigenstiffnesses) representthe genuine poroelastic parameters. The set of seven eigenstrains and corresponding eigenstiffnesses constitute the eigensystem of the poroelastic medium. Complete characterization of the eigensystems corresponding to different types of anisotropies encountered in geologic media is achieved. The first six eigenstrains do not differ substantially from the six eigenstrains in elastic nonporous media, which are well documented in the literature. In contrast, the next result is the existence of a seventh eigenstrain characterized by reduction of the total volume of the porous medium associated with an increase in fluid content. Finally, the analysis is applied to experimental data on a rock sample of Pfalz sandstone, considered as an arbitrarily anisotropic porous medium. Thus, more complex mechanical behaviors of rocks can be introduced naturally, including viscoelastic rheology (already published), frequency dependence, nonlinearity, and even hysteresis, as has been done recently in nonporous media.

Going from stable creep to aseismic slow slip events in the ductile realm

2020 ◽  
Author(s):  
Marcel Thielmann ◽  
Thibault Duretz
Keyword(s):  
Numerical Models ◽  
Ambient Pressure ◽  
Ductile Deformation ◽  
Seismic Events ◽  
Slow Slip ◽  
Aseismic Slip ◽  
Slow Slip Events ◽  
Ground Shaking ◽  
Field Plate ◽  
Viscoelastic Rheology

<p>The accommodation of motion on faults spans a large spectrum of slip modes, ranging from stable creep to earthquakes. While seismic slip modes certainly have the largest impact on the surface due to the induced ground shaking, it has been recognized that slow aseismic slip modes relax most of the accumulated stresses on a fault. It has also been suggested that aseismic slip controls seismic events, thus making this kind of slip mode key for earthquake prediction.</p><p>Despite the importance of aseismic slow slip, its underlying physical mechanisms are still unclear. Commonly, slow slip events are modeled in terms of frictional failure, employing a rate-and-state model of fault friction, often also invoking fluids that alter frictional properties on the fault. However, at larger depths, frictional processes become increasingly difficult to activate due to the increase in ambient pressure and ductile processes are more likely to dominate deformation.</p><p>Here we therefore investigate deep aseismic slip processes governed by ductile deformation mechanisms using 2D numerical models, where we employ a composite viscoelastic rheology combined with grain size reduction and shear heating as weakening processes. We show that the collaborative action of these two weakening mechanisms is sufficient to create the entire spectrum of aseismic slip, ranging from stable creep to long-term slow slip events. The results show that ductile deformation does not necessarily result in stable slip and induces slip modes with considerably larger velocities than the far-field plate velocities. Moreover, the propagation of ductile ruptures induces large stresses in front of the rupture tip which may also trigger short-term seismic events.</p>

scholarly journals A polymer–solvent model of biofilm growth

2010 ◽  
Vol 467 (2129) ◽  
pp. 1449-1467 ◽  
Author(s):  
H. F. Winstanley ◽  
M. Chapwanya ◽  
M. J. McGuinness ◽  
A. C. Fowler
Keyword(s):  
Numerical Solutions ◽  
Travelling Waves ◽  
Travelling Wave ◽  
Bacterial Biofilms ◽  
Travelling Wave Solutions ◽  
Biofilm Growth ◽  
One Dimensional ◽  
Solvent Model ◽  
Time Dependent Problem ◽  
Viscoelastic Rheology

We provide and analyse a model for the growth of bacterial biofilms based on the concept of an extracellular polymeric substance as a polymer solution, whose viscoelastic rheology is described by the classical Flory–Huggins theory. We show that one-dimensional solutions exist, which take the form at large times of travelling waves, and we characterize their form and speed in terms of the describing parameters of the problem. Numerical solutions of the time-dependent problem converge to the travelling wave solutions.

Geodetic and seismic constraints on recent activity at Long Valley Caldera, California: evidence for viscoelastic rheology

2001 ◽  
Vol 105 (3) ◽  
pp. 183-206 ◽  
Author(s):  
A.V Newman ◽  
T.H Dixon ◽  
G.I Ofoegbu ◽  
J.E Dixon
Keyword(s):  
Long Valley Caldera ◽  
Long Valley ◽  
Recent Activity ◽  
Viscoelastic Rheology
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