Multiscale modeling of the viscoelastic properties of CNT/polymer nanocomposites, using complex and time-dependent homogenizations

Most analytical and semi-analytical models for pumping-induced land subsidence invoke the simplifying assumptions regarding characteristics of geomaterials, as well as the pattern of drawdown response to pumping. This paper presents an analytical solution for one-dimensional consolidation of the multilayered soil due to groundwater drawdown, in which viscoelastic property and time-dependent drawdown are taken into account. The presented solution is developed by using the boundary transformation techniques. The validity of the proposed solution is verified by comparing with a degenerated case for a single layer, as well as with the numerical solutions and experimental results for a two-layer system. The difference between the average consolidation degree Up defined by hydraulic head and that Us defined by total settlement is discussed. The detailed parametric studies are conducted to reveal the effects of viscoelastic properties and drawdown patterns on the consolidation process. It is revealed that while the effect of different drawdown response patterns is significant during the early-intermediate stages of consolidation, the viscoelastic properties may have a more dominant influence on long-term consolidation behavior, depending on the values of the material parameters, which are reflected in both the deformation process of soil layers and the dissipation of excess pore-water pressure.

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Uncertainty quantification for multiscale modeling of polymer nanocomposites with correlated parameters

Composites Part B Engineering ◽

10.1016/j.compositesb.2014.09.008 ◽

2015 ◽

Vol 68 ◽

pp. 446-464 ◽

Cited By ~ 134

Author(s):

N. Vu-Bac ◽

R. Rafiee ◽

X. Zhuang ◽

T. Lahmer ◽

T. Rabczuk

Keyword(s):

Uncertainty Quantification ◽

Polymer Nanocomposites ◽

Multiscale Modeling ◽

Correlated Parameters

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A multiscale modeling of damage and time-dependent behavior of cohesive rocks

International Journal for Numerical and Analytical Methods in Geomechanics ◽

10.1002/nag.727 ◽

2009 ◽

Vol 33 (5) ◽

pp. 567-589 ◽

Cited By ~ 17

Author(s):

A. Abou-Chakra Guéry ◽

F. Cormery ◽

J. F. Shao ◽

D. Kondo

Keyword(s):

Multiscale Modeling ◽

Time Dependent ◽

Dependent Behavior

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Modular-based multiscale modeling on viscoelasticity of polymer nanocomposites

Computational Mechanics ◽

10.1007/s00466-016-1346-3 ◽

2016 ◽

Vol 59 (2) ◽

pp. 187-201 ◽

Cited By ~ 2

Author(s):

Ying Li ◽

Zeliang Liu ◽

Zheng Jia ◽

Wing Kam Liu ◽

Saad M. Aldousari ◽

...

Keyword(s):

Polymer Nanocomposites ◽

Multiscale Modeling

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Characterizing the viscoelastic properties of thin hydrogel-based constructs for tissue engineering applications

Journal of The Royal Society Interface ◽

10.1098/rsif.2005.0065 ◽

2005 ◽

Vol 2 (5) ◽

pp. 455-463 ◽

Cited By ~ 180

Author(s):

Mark Ahearne ◽

Ying Yang ◽

Alicia J El Haj ◽

Kong Y Then ◽

Kuo-Kang Liu

Keyword(s):

Tissue Engineering ◽

Viscoelastic Properties ◽

Biological Tissues ◽

Constant Load ◽

Time Dependent ◽

Hydrogel Membranes ◽

Agarose Hydrogel ◽

Viscoelastic Theory ◽

Working Distance ◽

Convenient Technique

We present a novel indentation method for characterizing the viscoelastic properties of alginate and agarose hydrogel based constructs, which are often used as a model system of soft biological tissues. A sensitive long working distance microscope was used for measuring the time-dependent deformation of the thin circular hydrogel membranes under a constant load. The deformation of the constructs was measured laterally. The elastic modulus as a function of time can be determined by a large deformation theory based on Mooney–Rivlin elasticity. A viscoelastic theory, Zener model, was applied to correlate the time-dependent deformation of the constructs with various gel concentrations, and the creep parameters can therefore be quantitatively estimated. The value of Young's modulus was shown to increase in proportion with gel concentration. This finding is consistent with other publications. Our results also showed the great capability of using the technique to measure gels with incorporated corneal stromal cells. This study demonstrates a novel and convenient technique to measure mechanical properties of hydrogel in a non-destructive, online and real-time fashion. Thus this novel technique can become a valuable tool for soft tissue engineering.

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