Digital Repository, ICF12, Ottawa 2009

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Modeling of the processes of hydrogen absorption and hydrogen cracking of steels
R.V. Goldstein, Yu.V. Zhitnikov

Last modified: 2013-05-07


Quantitative physical-mechanical models of hydrogen action on metal at different
mechanisms of its storing were suggested. The first mechanism is related to
atomic hydrogen diffusion and storing at the interface of two metals accompanied
by cracklike defect formation and growth. The crack grows under the action of
hydrogen pressure on its surfaces and the crack speed is dependent on the stress
intensity factor. The hydrogen pressure and stress intensity factor are selfconsistently
determined on the basis of solving diffusion and elasticity problems
accounting for the crack growth.
The second mechanism models the storing of hydrogen in bulk on dislocation
defects of the metal crystalline lattice which represent energetic traps. The
hydrogen storing process is accompanied by volume deformation of metal and
generation of inner stresses. A kinetic model of inner stresses variation at
hydrogen storing versus the concentration of coupled hydrogen in the crystalline
lattice is suggested in the paper.

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