Evaluation of the stress-strain state at the crack tip in casing pipes based on numerical modeling

Keywords

steam generator 22K steel, energy approach, hydrogen environment, high temperature, residual strength.

Cite as

Ivanytskyi Ya. L., Hvozdiuk M. M., Klymenko D. V., Hrynenko M. V., and Maksymenko O. P. Modeling of the effect of hydrogenation at elevated temperatures on the strength of steam generator pipes steel of the nuclear power plant. Physico­chemical Mechanics of Materials. 2022. 58(4), 026-031.

Abstract

The operating conditions for modeling and evaluating the invariant strength characteristics of 22K steam-generator steel at high temperature and the action of gaseous hydrogen are analyzed. The importance of using the energy criterion, which takes into account the change in true stresses and strains under the action of internal pressure at high temperatures of the hydrogen medium, is demonstrated. Diagrams of the limit state of 22K steel under the com­bined effect of mechanical load and high temperatures are constructed. An approach to determining the degree of pipeline damage under operating conditions based on the ratio of elastic-plastic deformation energy and specific fracture energy of 22K steel is proposed.

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