“…The found dependence of the fracture stress on the hydrogen concentration is com pared with the experimental data, and their excellent correspondence to one another is shown. Thus, following [11], let us consider the simplest model of hydrogenated metal with the total number N 0 of chemical bonds, where N H of them are broken, i.e., atomic hydrogen is already built in inside them. We will consider that all N H broken bonds and N 0 -N H unbroken bonds are identical and, consequently, indistinguishable.…”