Modeling the Effect of Hydrogen Charging at Elevated Temperatures on the Strength of NPP Steam Generator Pipes Steel

Ivanyts’kyi, Ya. L.; Hvozdiuk, M. M.; Klymenko, D. V.; Hrynenko, Mykhailo; Maksymenko, O. P.

doi:10.1007/s11003-023-00684-4

Cited by 1 publication

(3 citation statements)

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“…The area enclosed by the diagram corresponds to the specific fracture energy of the material, which is invariant to loading conditions and most fully evaluates the behavior of the material under the influence of a hydrogen environment. In [19], it is shown that when the material fractures in hydrogen, the fracture stresses change little in the hydrogen environment, meaning that evaluating the load-bearing capacity of the structure under the influence of hydrogen using the force-based approach is incorrect. However, the specific fracture energy decreases by 70-90%.…”

Section: Resultsmentioning

confidence: 99%

“…For this, the results of reducing the cross-section of the The construction of complete equilibrium diagrams to determine the specific energy of strain and failure with a stress concentrator was carried out under the axial tension of the tubular sample. During the stretching process, the amount of force P and the change in elongation ∆l along the bottom of the concentrator were recorded on a 0.5 mm base, using the method involving the optical-digital correlation of speckle images, which corresponds to the condition of invariance of strain for this steel [19].…”

Section: Methodsmentioning

confidence: 99%

“…It should be noted that the metal flooding process occurs under operating conditions where the stress-strain state in the pipeline can change from elastic to elastic-plastic, which affects the concentration of hydrogen in local volumes and reduces the bearing capacity [19].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Technical Condition of Pipes during the Transportation of Hydrogen Mixtures According to the Energy Approach

Ivanytskyi,

Blikharskyy,

Sęp

et al. 2024

Applied Sciences

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In this study, a theoretical–experimental methodology for determining the stress–strain state in pipeline systems, taking into account the hydrogen environment, was developed. A complex of theoretical and experimental studies was conducted to determine the specific energy of destruction as an invariant characteristic of the material’s resistance to strain at different hydrogen concentrations. The technique is based on the construction of complete diagrams of the destruction of the material based on the determination of true strains and stresses in the local volume using the method involving the optical–digital correlation of speckle images. A complex of research was carried out, and true diagrams of material destruction were constructed, depending on the previous elastic–plastic strain and the action of the hydrogen environment. The change in the concentration of hydrogen absorbed by the material was estimated, depending on the value of the specific energy of destruction. A study was conducted on tubular samples, and the degree of damage to the material of the inner wall under the action of hydrogen and stress from the internal pressure was evaluated according to the change in specific energy, depending on the value of the true strain established with the help of an optical–digital correlator on the outer surface, and the degree of damage was determined. It has been established that the specific fracture energy of 17G1S steel decreases by 70–90% under the influence of hydrogen. The effect of the change in the amount of strain energy on the thickness of the pipe wall is illustrated.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%