scholarly journals Stress-Diffusion Coupling and Viscoelastic Effects on Early Stage Spinodal Decomposition in Polymer Solutions

2006 ◽  
Vol 2 ◽  
pp. 37-41
Author(s):  
Mikihito Takenaka ◽  
Nobuyuki Toyoda ◽  
Shin Saito ◽  
Takeji Hashimoto
Keyword(s):  
Spinodal Decomposition ◽  
Polymer Solutions ◽  
Early Stage ◽  
Diffusion Coupling ◽  
Stress Diffusion ◽  
Viscoelastic Effects

scholarly journals Viscoelastic effects on early stage of spinodal decomposition in dynamically asymmetric polymer blends

2006 ◽  
Vol 124 (10) ◽  
pp. 104904 ◽  
Author(s):  
Mikihito Takenaka ◽  
Hiroyuki Takeno ◽  
Takeji Hashimoto ◽  
Michihiro Nagao
Keyword(s):  
Polymer Blends ◽  
Spinodal Decomposition ◽  
Early Stage ◽  
Viscoelastic Effects

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.

scholarly journals The Effects of Inhomogeneous Elasticity and Dislocation on Thermodynamics and the Kinetics of the Spinodal Decomposition of a Fe-Cr System: A Phase-Field Study

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1209
Author(s):  
Wooseob Shin ◽  
Jeonghwan Lee ◽  
Kunok Chang
Keyword(s):  
Spinodal Decomposition ◽  
Phase Field ◽  
Early Stage ◽  
Field Method ◽  
Phase Field Method ◽  
Precipitate Size ◽  
System A ◽  
Phase Separation Kinetics ◽  
Cr Concentration ◽  
Cr System

The effects of inhomogeneous elasticity and dislocation on the microstructure evolution of α′ precipitate in a Fe-Cr system was investigated using a Computer Coupling of Phase Diagrams and Thermochemistry (CALPHAD)-type free energy incorporated phase-field method. In order to simulate the precipitation behavior by phase-field modeling in consideration of inhomogeneous elasticity, a Multiphysics Object-Oriented Simulation Environment (MOOSE) framework was used, which makes it easy to use powerful numerical means such as parallel computing and finite element method (FEM) solver. The effect of inhomogeneous elasticity due to the compositional inhomogeneity or the presence of dislocations affects the thermodynamic properties of the system was investigated, such as the lowest Cr concentration at which spinodal decomposition occurs. The effect of inhomogeneous elasticity on phase separation kinetics is also studied. Finally, we analyzed how inhomogeneous elasticity caused by compositional fluctuation or dislocation affects microstructure characteristics such as ratio between maximum precipitate size with respect to the average on early stage and later stage, respectively.

Validity of linear analysis in early-stage spinodal decomposition of a polymer mixture

2000 ◽  
Vol 113 (8) ◽  
pp. 3414-3422 ◽  
Author(s):  
Masaki Hayashi ◽  
Hiroshi Jinnai ◽  
Takeji Hashimoto
Keyword(s):  
Spinodal Decomposition ◽  
Early Stage ◽  
Linear Analysis ◽  
Polymer Mixture
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