Detection of Prefracture Zones in Structural Materials by Magnetic and Optical Methods

Yu. V. Khudorozhkova; S. M. Zadvorkin; S. V. Burov; and I. S. Kamantsev

doi:10.17804/2410-9908.2023.1.024-040

Yu. V. Khudorozhkova, S. M. Zadvorkin, S. V. Burov, and I. S. Kamantsev

DETECTION OF PREFRACTURE ZONES IN STRUCTURAL MATERIALS BY MAGNETIC AND OPTICAL METHODS

DOI: 10.17804/2410-9908.2023.1.024-040

The study of the applicability of magnetic and optical methods to the detection
of prefracture zones under fatigue degradation of structural materials is exemplified by the 09G2S steel. The regularities of changes in the signal of an attached fluxgate gradiometer with the increasing number of loading cycles have been revealed; namely, significant changes in the gradiometer readings on individual specimen surface areas prove to result from the formation of fracture zones. The change in the value of the coefficient of correlation among the speckle images is studied at different stages of cyclic testing. The appearance of speckle image heterogeneity is shown to be due to fracture nucleation. Thus, the applicability of magnetic and speckle-interferometric methods to detecting prefracture zones in objects under cyclic loading is substantiated.

Acknowledgement: The work was performed under state assignment No. AAAA-A18-118020790148-1. The study used the equipment of the Plastometriya shared research facilities. We appreciate the assistance of Prof. A. P. Vladimirov, staff member of the laboratory of engineering diagnostics, IES UB RAS, who has developed the original procedure of dynamic optical speckle interferometry.

Keywords: magnetic state, flux gate, gradiometer, leakage field, speckle image, surface profile, cyclic testing, nondestructive testing, pipe steel

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Ю. В. Худорожкова, С. М. Задворкин, С. В. Буров, И. С. Каманцев

ОБНАРУЖЕНИЕ ЗОН ПРЕДРАЗРУШЕНИЯ В КОНСТРУКЦИОННЫХ МАТЕРИАЛАХ МАГНИТНЫМИ И ОПТИЧЕСКИМИ МЕТОДАМИ

На примере стали 09Г2С изучены возможности магнитных и оптических методов обнаружения зон предразрушения при усталостной деградации конструкционных материалов. Выявлены закономерности изменения сигнала приставного феррозондового градиентометра с ростом числа циклов нагружения, а именно, установлено, что значительные изменения показаний градиентометра на отдельных участках поверхности исследованных образцов обусловлены формированием очагов разрушения. Исследовано изменение величины коэффициента корреляции спекловых изображений на разных стадиях циклических испытаний. Показано, что возникновение неоднородности на картине спекловых изображений связано с зарождением очага разрушения. Таким образом, обоснована возможность использования магнитных и спекл-интерферометрических методов для обнаружения зон предразрушения при циклическом нагружении объектов.

Благодарность: Работа выполнена в рамках государственного задания, № государственной реги-страции АААА-А18-118020790148-1. При проведении исследований использовано оборудова-ние ЦКП «Пластометрия». Авторы выражают благодарность сотруднику лаборатории технической диагно-стики ИМАШ УрО РАН Владимирову А. П. за разработанную оригинальную методику динамического варианта оптической спекл-интерферометрии.

Ключевые слова: магнитное состояние, феррозонд, градиентометр, поле рассеяния, спекловое изображение, профиль поверхности, циклические испытания, неразрушающий контроль, трубная сталь.

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Библиографическая ссылка на статью

Detection of Prefracture Zones in Structural Materials by Magnetic and Optical Methods / Yu. V. Khudorozhkova, S. M. Zadvorkin, S. V. Burov, and I. S. Kamantsev // Diagnostics, Resource and Mechanics of materials and structures. - 2023. - Iss. 1. - P. 24-40. -
DOI: 10.17804/2410-9908.2023.1.024-040. -
URL: http://dream-journal.org/issues/content/article_392.html
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