Influence of chemical stresses in the permeation, one-side and two-side charging processes

Ko, Sun–Chien; Zhang, Tong‐Yi; Lee, Sanboh

doi:10.1063/1.2737383

Cited by 2 publications

(3 citation statements)

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“…The reason is that the absorption and desorption processes have a slight effect on diffusion for small V s /V b , especially at the entry surface, compared with the effect of the external stress gradient. In other words, the lower the value of V s /V b , the less dominant the surface effect, as discussed by Zhang et al [29,30].…”

Section: Development Of Concentrationmentioning

confidence: 88%

“…The coupling effects of chemical stresses and external mechanical stresses on diffusion are analysed. A selfconsistent diffusion equation including the chemical stress and the external mechanical stress gradient has been developed based on Zhang et al's [7,29] work by using thermodynamic theory and Fick's law.…”

Section: Discussionmentioning

confidence: 99%

“…From figure 5, it is obvious that both external stress and chemical stresses will increase the value of concentration. According to the results of Ko et al [29], if the effects of chemical stresses are neglected, the concentration profile in one-side charging will be identical to the half concentration profile in both-side charging. When the external stress gradient exists discussed herein, the concentration profile in both types of charging processes will be different.…”

Section: Development Of Concentrationmentioning

confidence: 97%

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Coupling effects of chemical stresses and external mechanical stresses on diffusion

Xuan¹,

Shao²,

Wang³

et al. 2008

J. Phys. D: Appl. Phys.

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Interaction between diffusion and stress fields has been investigated extensively in the past. However, most of the previous investigations were focused on the effect of chemical stress on diffusion due to the unbalanced mass transport. In this work, the coupling effects of external mechanical stress and chemical stress on diffusion are studied. A self-consistent diffusion equation including the chemical stress and external mechanical stress gradient is developed under the framework of the thermodynamic theory and Fick's law. For a thin plate subjected to unidirectional tensile stress fields, the external stress coupled diffusion equation is solved numerically with the help of the finite difference method for one-side and both-side charging processes. Results show that, for such two types of charging processes, the external stress gradient will accelerate the diffusion process and thus increase the value of concentration while reducing the magnitude of chemical stress when the direction of diffusion is identical to that of the stress gradient . In contrast, when the direction of diffusion is opposite to that of the stress gradient , the external stress gradient will obstruct the process of solute penetration by decreasing the value of concentration and increasing the magnitude of chemical stress. For both-side charging process, compared with that without the coupling effect of external stress, an asymmetric distribution of concentration is produced due to the asymmetric mechanical stress field feedback to diffusion.

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Section: Development Of Concentrationmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Development Of Concentrationmentioning

confidence: 97%

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