PSI - Issue 33

S. Schoenborn et al. / Procedia Structural Integrity 33 (2021) 757–764 S. Schoenborn, T. Melz, J. Baumgartner, C. Bleicher / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 6. ε/N curve for 1.4521 (X2CrMoTi18 -2) in air and in pressurized hydrogen for unnotched specimens.

Fig. 7. Cyclic stress strain curve for 1.4521 (X2CrMoTi18-2) in air and in pressurized hydrogen.

For strain amplitudes of ε a,t = 0.2 %, there is only a slight cyclic hardening. Experiments with higher strain amplitudes such as ε a,t = 0.8 %, show more significant cyclic hardening but only within the first ten cycles after which a saturation is reached. At a total strain amplitude of ε a,t = 0.8 % the specimen exposed to pressurized hydrogen did fail significantly earlier, without any changes in stress being observed initially, Fig. 8.

Fig. 8. Cyclic deformation curves for 1.4521 (X2CrMoTi18-2) in air and in pressurized hydrogen for ε a,t = 0.2 % and 0.8 %.