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Our /)revious /)a/)er clarified the hydrogen-dislocation interaction and its role in hydrogen embrittlement. .Now the consequence of the hydrogendislocation interaction was sought to explain stress (strain )-induced diffusion of hydrogen, assuming that the region of higher dislocation densi!)! could hold a higher hydrogen concentration per unit volume. W e have formulated the stress (strain)-induced diffusion in the form of augmented Fick's second law. Here, the local plastic strain represents the dislocation densi!)! gradient , and is coupled with the ordinary diffusion equation. The augmented equation was proved to be a successful mean to calculate, in quantitative manner, hydrogen concentration at plastically deformed notch region. The compatibili!)! of the calculations and experiments favours our p resent formulation . Thus, usually unpredictable hydrogen cracking of welded structures or steel structures in gClleral could be p,"edicted, provided that the equation with the corresponding boundary and initial conditions is solved successfully. Since local /)lastic strain is in the equation , elastic-plastic analysis is done before diffusion problem analysis . Computer-aided finite element method is the most suitable to solve such problems .

Formulation of Stress (Strain)-induced Diffusion of Hydrogen and Its Solution by Computer-aided Finite Element Method