Assessing life time of a shaft with a crack in hydrogen

Keywords

fatigue crack, hydrogen gas, fatigue fracture kinetic diagram, lifetime prediction.

Cite as

Hembara O. V., Holian O. M., Chepil O. Ya., Paliukh V. M., Sapuzhak Ya. I., and Soviak I. M. Assessing life time of a shaft with a crack in hydrogen. Physicochemical Mechanics of Materials. 2023. 59(2), 67-72.

https://doi.org/10.15407/pcmm2023.02.067

Abstract

A theoretical-experimental approach for predicting the kinetics of fatigue crack growth and determining the lifetime of the responsible elements of structures in hydrogen is proposed. Based on the created calculation model of fatigue crack growth and experimen­tally constructed kinetic diagrams of fatigue failure of 35KhN3MFA steel, the residual life of the rotor shaft of the steam generator, weakened by a surface semi-elliptical crack in air and in gaseous hydrogen environment, is determined. It is established that hydrogen reduces the residual life of the rotor shaft by two orders of magnitude in hydrogen, compa­red to its residual lifee in air.

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