Issue 51

A. A. Lakhdari et alii, Frattura ed Integrità Strutturale, 51 (2020) 236-253; DOI: 10.3221/IGF-ESIS.51.19 249 In this case, the redistribution of the constraints is also observed. Loading №4. The hollow cylinder is subjected to the internal and external pressures in P and out P respectively, and in out P P  , the concentration of hydrogen on the outer surface is constant, and on the inside - it increases linearly with each time step from a certain initial value. As a result, we obtain a time-varying concentration field (Figs. 21 and 22). The intensity of the stresses is shown in Fig. 23. The radial, tangential and axial stresses at time t = 11 are presented in Figs. 24, 25, and 26. There is also a redistribution of the constraints, and more intense than in the cases of loading previously envisaged. In Fig. 27, the stress intensity curves S INT , the axial stresses S Z , radial and tangential stresses S X and S Y are presented according to the thickness of the wall of the cylinder at time t =11. Figure 20 : Stress curves according to the thickness at the moment 18 t  . Figure 21 : Concentration field of hydrogen at the moment  5 t  .