Extended Stress-Diffusion Coupling Model for Swelling Dynamics of Polymer Gels

2012 ◽  
Vol 51 (8) ◽  
pp. 3466-3471 ◽  
Author(s):  
Jiasong Geng ◽  
Meie Li ◽  
Jinxiong Zhou
Keyword(s):  
Polymer Gels ◽  
Coupling Model ◽  
Diffusion Coupling ◽  
Stress Diffusion

Boundary Conditions in the Diffusion of Fluids in Swelling Polymers

2008 ◽  
Vol 273-276 ◽  
pp. 186-191
Author(s):  
Anne Lise Durier ◽  
Katell Derrien ◽  
Pierre Gilormini
Keyword(s):  
Boundary Conditions ◽  
Water Uptake ◽  
Coupling Model ◽  
Uptake Curve ◽  
Diffusion Coupling ◽  
Various Boundary Conditions ◽  
Stress Diffusion

Diffusion of fluids in polymers may lead to swelling, which induces stress-diffusion coupling. A simple coupling model is considered, where boundary conditions only are altered, and it leads to a sigmoidal water-uptake curve for a plate in water. Several other models are studied, which are able to induce similar sorption curves by using various boundary conditions, but comparisons between other predictions of the models reveal significant differences. Eventually, none of the models considered is able to reproduce all features of the coupling model.

A Mechano-Chemical Coupling for Hydrogen Diffusion in Metals Based on a Thermodynamic Approach

2014 ◽  
Vol 353 ◽  
pp. 286-291 ◽  
Author(s):  
Nicolas Creton ◽  
Steeve Dejardin ◽  
B. Grysakowski ◽  
Virgil Optasanu ◽  
Tony Montesin
Keyword(s):  
Hydrogen Diffusion ◽  
Thermodynamic Approach ◽  
Finite Element Code ◽  
Diffusion Mode ◽  
Significant Progress ◽  
Diffusion Coupling ◽  
Metal Parts ◽  
Stress Diffusion ◽  
Steel Tank ◽  
Chemical Coupling

Hydrogen diffusion in metals is still an ongoing topic of research due to its technical relevance (hydrogen embrittlement, hydrogen storage...). In the last decades, significant progress in understanding the time evolution of the hydrogen concentration in solids was completed. This paper presents a modeling of hydrogen diffusion with a general and thermodynamically based diffusion concept coupled with mechanical and chemical aspects. This model was previously used to simulate the oxidation of a metal [1][2]. This concept has been upgraded to offer a thoroughly macroscopic behavior law used to simulate hydrogen diffusion in metal parts under mechanical loadings. The thermodynamic approach of the stress-diffusion coupling was implemented in a finite element code in order to study the hydrogen diffusion mode into a strained metal. Simulations were performed on a cylindrical austenitic steel tank under important internal pressure. The results of this study allow us to understand how hydrogen diffusion and mechanical stresses are mutually induced and modified.

Electrostress Diffusion Coupling Model for Polyelectrolyte Gels

2005 ◽  
Vol 38 (4) ◽  
pp. 1349-1356 ◽  
Author(s):  
Tatsuya Yamaue ◽  
Hiroto Mukai ◽  
Kinji Asaka ◽  
Masao Doi
Keyword(s):  
Coupling Model ◽  
Diffusion Coupling ◽  
Polyelectrolyte Gels

scholarly journals Swelling and shrinking in prestressed polymer gels: an incremental stress–diffusion analysis

2019 ◽  
Vol 475 (2230) ◽  
pp. 20190174 ◽  
Author(s):  
Marco Rossi ◽  
Paola Nardinocchi ◽  
Thomas Wallmersperger
Keyword(s):  
Chemical Potential ◽  
Polymer Gels ◽  
Mechanical Analysis ◽  
Test Case ◽  
Diffusion Analysis ◽  
Stress Diffusion ◽  
Nonlinear Stress ◽  
Deformation State ◽  
Poroelastic Theory ◽  
Elastic Constraint

Polymer gels are porous fluid-saturated materials which can swell or shrink triggered by various stimuli. The swelling/shrinking-induced deformation can generate large stresses which may lead to the failure of the material. In the present research, a nonlinear stress–diffusion model is employed to investigate the stress and the deformation state arising in hydrated constrained polymer gels when subject to a varying chemical potential. Two different constraint configurations are taken into account: (i) elastic constraint along the thickness direction and (ii) plane elastic constraint. The first step entirely defines a compressed/tensed configuration. From there, an incremental chemo-mechanical analysis is presented. The derived model extends the classical linear poroelastic theory with respect to a prestressed configuration. Finally, the comparison between the analytical results obtained by the proposed model and a particular problem already discussed in literature for a stress-free gel membrane (one-dimensional test case) will highlight the relevance of the derived model.

633 Dynamic State Sapce Representation with Electrostress Diffusion Coupling Model for IPMC Actuator

2007 ◽  
Vol 2007 (0) ◽  
pp. _633-1_-_633-6_
Author(s):  
Takaaki OSADA ◽  
Kentaro TAKAGI ◽  
Yoshikazu HAYAKAWA ◽  
Zhiwei LUO
Keyword(s):  
Coupling Model ◽  
Dynamic State ◽  
Diffusion Coupling

Characterization of Stress-Diffusion Coupling in Lithiated Germanium by Nanoindentation

2018 ◽  
Vol 58 (4) ◽  
pp. 613-625 ◽  
Author(s):  
M. Papakyriakou ◽  
X. Wang ◽  
S. Xia
Keyword(s):  
Diffusion Coupling ◽  
Stress Diffusion

scholarly journals Electrostress Diffusion Coupling Model for Polyelectrolyte Gels. Volume 38, Number 4, February 22, 2005, pp 1349−1356.

2005 ◽  
Vol 38 (17) ◽  
pp. 7528-7528
Author(s):  
Tatsuya Yamaue ◽  
Hiroto Mukai ◽  
Kinji Asaka ◽  
Masao Doi
Keyword(s):  
Coupling Model ◽  
Diffusion Coupling ◽  
Polyelectrolyte Gels
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