Computational analysis of geometrical factors affecting experimental data extracted from hydrogen permeation tests: II – Consequences of trapping and an oxide layer

Effect of addition of oxygen and water vapor on fretting fatigue properties of an austenitic stainless steel in hydrogen

“…The hydrogenassisted fretting fatigue failure was clarified. On the other hand, there is a possibility in which oxygen added to hydrogen environment acts as an inhibitor of the effect of hydrogen [20,21]. For this study, further experiments and discussions on the interaction between hydrogen and oxygen are required in the future.…”

Comments on “Computational analysis of geometrical factors affecting experimental data extracted from hydrogen permeation tests: I – Consequences of trapping” [Int J Hydrogen Energy 36 (2011) 12644–12652] and “… II – Consequences of trapping and an oxide layer” [Int J Hydrogen Energy 37 (2012) 13574–13582], “Corrigenda …” to both [Int J Hydrogen Energy 39 (2014) 2430], and on “… III – Comparison with experimental results from the literature” [Int J Hydrogen Energy 39 (2014) 1145–1155] with “Generalized mod

“…9a in Ref. [2] allow of a deduction that the boundary-value problems solved in Refs. [1,2], and evidently in Ref.…”

“…Their resulting equation of diffusion [8,9] seemingly resembles the disputed one (6), but is not the same. Having common premises with [1,2,4,12], deductions in Refs. [8,9] were performed in distinct manner reducing the keystone equations (1)e(3) to the next one adjusted to what they called "the Kirchheim c concept" [8]:…”

“…However, the fact that equation (8) deals with the total concentration C as the variable in question, but not with C L as equation (6) does, is the first distinction between them. In more detail, Svoboda and Fischer [8] transformed the flux relation (2) in the manner that Oriani did before [6], i.e., employing the chain rule for spatial derivative VC L ¼ ðvC L =vCÞVC in the flux definition (2) to phrase it as follows:…”

“…By transforming equation (1) with the use of a chain rule for time derivative vC T =vt ¼ ðvC T =vC L ÞðvC L =vtÞ, customary equation of trapping-affected diffusion in terms of lattice concentration C L [1,2,4,5,7,10] is retrieved from (1) and (2) as follows:…”