Verification of Plastic Strain Values During Ovalization of a Ring Specimen from a Fuel Element Shell of a Fast Neutron Reactor

R. P. Karagergi; A. V. Konovalov; A. V. Kozlov

doi:10.17804/2410-9908.2024.5.117-129

R. P. Karagergi, A. V. Konovalov, A. V. Kozlov

VERIFICATION OF PLASTIC STRAIN VALUES DURING OVALIZATION OF A RING SPECIMEN FROM A FUEL ELEMENT SHELL OF A FAST NEUTRON REACTOR

DOI: 10.17804/2410-9908.2024.5.117-129

Mechanical testing of ring specimens for radial compression between flat dies (ovalization) was carried out, supplemented by analyzing the stress-strain state calculated by a specialized computer program. To verify the values of plastic strain, laser marks were made on the side surface of the ring. It is found that the maximum plastic deformation accumulates at the inner and outer walls of the ring, where maximum tensile and compressive stresses act, respectively. The deviation of the experimental values of plastic strain from the predicted ones does not exceed 10%. It is shown that the analysis of the stress-strain state of the ring specimen during ovalization can be useful for evaluating the critical values of the mechanical characteristics of the shell material irradiated in a fast neutron reactor to a high damaging dose.

Acknowledgement: The work was performed under the state assignment from the Russian Ministry of Science and Higher Education (theme Structure, No. 122021000033-2), the state assignment for the IES UB RAS, R&D No. 124020600042-9, and the program of the Rosatom State Nuclear Energy Corporation on increasing the maximum fuel burnup in the fuel assemblies of fast neutron reactors.

Keywords: fuel rod element shell, austenitic steel, mechanical tests, ring sample, stress-strain state, grid method

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Р. П. Карагерги, А. В. Коновалов, А. В. Козлов

ВЕРИФИКАЦИЯ ЗНАЧЕНИЙ ПЛАСТИЧЕСКОЙ ДЕФОРМАЦИИ ПРИ ОВАЛИЗАЦИИ КОЛЬЦЕВОГО ОБРАЗЦА ИЗ ОБОЛОЧКИ ТВЭЛА РЕАКТОРА НА БЫСТРЫХ НЕЙТРОНАХ

Проведены механические испытания на сжатие кольцевых образцов плоскими бойками в радиальном направлении (овализация образцов), дополненные анализом напряженно-деформированного состояния, рассчитанного по специализированной компьютерной программе. Для верификации значений пластической деформации использовали метки, нанесенные лазером на боковую поверхность кольца. Установлено, что максимальная пластическая деформация накапливается у внутренней и наружной стенок кольца, где действуют, соответственно, максимальные растягивающие и сжимающие напряжения. Расхождение экспериментальных и расчетных значений мер пластической деформации не превышает 10 %. Показано, что анализ напряженно-деформированного состояния кольцевого образца при овализации может быть полезен для оценки критических значений механических характеристик материала оболочки, облученной в реакторе на быстрых нейтронах до большой повреждающей дозы.

Благодарность: Работа выполнена в рамках государственного задания Минобрнауки России (тема «Структура», № 122021000033-2), государственного задания ИМАШ УрО РАН № НИОКТР 124020600042-9 и Программы ГК «Росатом» по повышению предельного выгорания топлива ТВС реакторов на быстрых нейтронах.

Ключевые слова: оболочка твэла, аустенитная сталь, механические испытания, кольцевой образец, напряжен-но-деформированное состояние, метод сеток

Библиография:

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Advanced techniques for mechanical testing of irradiated cladding materials / V. Grigoriev, R. Jakobsson, B. Josefsson, D. Schrire // Advanced Post-Irradiation Examination Techniques for Water Reactor Fuel : proceedings of a Technical Committee Meeting, Dimitrovgrad, Russian Federation, 14–18 May, 2001. – IAEA, 2002. – P. 187–193.
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The issue of stress state during mechanical tests to assess cladding performance during a reactivity-initiated accident (RIA) / J. Desquines, D. A. Koss, A. T. Motta, B. Cazalis, M. Petit // Journal of Nuclear Materials. – 2011. – Vol. 412. – P. 250–267. – DOI: 10.1016/j.jnucmat.2011.03.015.
Методические особенности испытаний на растяжение кольцевых образцов / М. В. Леонтьева-Смирнова, Б. А. Калин, Е. М. Морозов, А. В. Костюхина, П. В. Федотов, Р. Н. Такташев // Физика и химия обработки материалов. – 2019. – № 6. – С. 62–71. – DOI: 10.30791/0015-3214-2019-6-62-71.
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Determination of the hoop fracture properties of unirradiated hydrogen-charged nuclear fuel cladding from ring compression tests / M. A. Martin-Rengel, F. J. Gómez Sánchez, J. Ruiz-Hervías, L. Caballero // Journal of Nuclear Materials. - 2013. - Vol. 436 (1–3). – P. 123–129. - DOI: 10.1016/j.jnucmat.2013.01.311.
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Desquines J., Guilbert S. Effect of an oxide layer on the result of a ring compression test on a fuel cladding sample after a simulated LOCA transient // Top Fuel, Prague, Czech Republic, 2018, October 1–4, 2018 : proceedings of conference. – URL: https://www.researchgate.net/publication/328496506_EFFECT_OF_AN_OXIDE_LAYER_ON_THE_RESULT_OF_A_RING_COMPRESSION_TEST_ON_A_FUEL_CLADDING_SAMPLE_AFTER_A_SIMULATED_LOCA_TRANSIENT
Frolov A. S., Fedotov I. V., Gurovich B. A. Evaluation of the true-strength characteristics for isotropic materials using ring tensile test // Nuclear Engineering and Technology. – 2021. – Vol. 53 (7). – P. 2323–2333. – DOI: 10.1016/j.net.2021.01.033.
Construction of a strain-hardening diagram to analyze the state of stress in the fuel-element cladding material / R. P. Karagergi, A. V. Konovalov, M. V. Evseev, A. V. Kozlov // Russian Metallurgy (Metally). – 2023. – Vol. 2023. – P. 1528–1534. – DOI: 10.1134/S0036029523100117.
Microstructure of fracture surfaces after radial compression of annular specimens made of cladding austenitic steel exposed to damaging dose above 100 dpa / R. P. Karagergi, A. V. Kozlov, V. Yu. Yarkov, V. I. Pastukhov, S. V. Barsanova, T. A. Churyumova, N. M. Mitrofanova, M. V. Leontyeva-Smirnova // Physics of Metals and Metallography. - 2024. - Vol. 125 (6) - P. 665–672. – DOI: 10.1134/S0031918X2460043X.
Свидетельство о регистрации программы для ЭВМ № 2020612158 Рос. Федерация. Программа конечно-элементного моделирования растяжения овального образца на полуцилиндрических опорах : № 2020611060 : регистрация 04.02.2020 : опубл. 18.02.2020 / Коновалов А. В., Партин А. С.

Библиографическая ссылка на статью

Karagergi R. P., Konovalov A. V., Kozlov A. V. Verification of Plastic Strain Values During Ovalization of a Ring Specimen from a Fuel Element Shell of a Fast Neutron Reactor // Diagnostics, Resource and Mechanics of materials and structures. - 2024. - Iss. 5. - P. 117-129. -
DOI: 10.17804/2410-9908.2024.5.117-129. -
URL: http://dream-journal.org/issues/content/article_484.html
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