On the Question of Non-Destructive Testing and Technical Diagnostics in Russia

Klyuev, V. V.; Artem'ev, B. V.

doi:10.14489/td.2014.03.pp.045-060

Cited by 7 publications

(3 citation statements)

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“…Double-sided signal measurement upon the one-sided grinding of the surface is explained by the fact that the supposed fractional-dimensional layer moves into the depth of the body volume upon the changes of the one of the surfaces. As the penetration depth of the electromagnetic wave is in proportion to the output signal frequency [2,3], it was decided to measure the signal from the both sides of the plate and upon different frequencies with the purpose of "detection" of the moving transition layer.…”

Section: Fig1 Test Sample -Steel Plate With Dimensions 25х25х2 MMmentioning

confidence: 99%

Study of the Possibility of Estimating the Size of the Fractional-Dimensional Surface Layer by Electromagnetic Methods

Kuzeev

Pivovarov

2019

MSF

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It is known that the surface of a solid body and its volume part are different forms of the same substance. There is a hypothesis about the presence of a transition fractional-dimensional layer, which is the "limiter" of the volume from the surface. It is assumed that this layer is able to store information about changes in the surface and internal structures of the solid. The origin of defects, leading to destruction, in most cases begins in the surface and surface layers of the metal. In this regard, the existence of fractional-dimensional layer as a subsurface structure, which has information about the properties of the whole solid, is of particular importance in the detection of possible critical defects. In order to test this hypothesis, an experiment was conducted based on measuring the magnetic field strength of a steel plate (25x25x2 mm) when its thickness was changed. With the help of sandpaper, one side of the plate was swamped, and the second remained unchanged. The measurements of the magnetic field strength components were carried out on both sides with the plate thickness decreasing by 0.08-0.1 mm from 2.0 to 0.3 mm. Applying a linear approximation to the obtained dependence of the average tangential component of the magnetic field on the plate thickness, it was found that the extrapolated approximation line comes to a point close to zero (0.01 mm). It was assumed that the value 0.01 determines the preliminary value of the fractional-dimensional layer. Such an experiment was carried out for the first time, so the results obtained so far will undoubtedly become the basis for further research in this area.

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Section: Fig1 Test Sample -Steel Plate With Dimensions 25х25х2 MMmentioning

confidence: 99%

Study of the Possibility of Estimating the Size of the Fractional-Dimensional Surface Layer by Electromagnetic Methods

Kuzeev

Pivovarov

2019

MSF

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“…One of the most common nondestructive testing (NDT) methods [4,5] for testing dielectric coating continuity is the high-voltage method based on the occurrence of discharges at the formation of a high-intensity electric field (E) between the coating surface and a conductive substrate (Figure 1) [9]. The sensitivity of the method is achieved by differences in the dielectric strength of the flawless and defective areas of the coating.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Methods and Devices for Multi-Parameter High-Voltage Testing of Dielectric Coatings

Syasko,

Musikhin,

Gnivush

2024

Coatings

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Currently, the high voltage testing method is widely used to detect pinholes and porosity defects in dielectric coatings. However, most modern coatings also have requirements for the minimum allowable coating thickness. Conducting tolerance tests on the thickness of dielectric coatings concurrently along with monitoring integrity within a single technological process appears promising. Additionally, mitigating the impact of various interfering parameters is crucial. This paper conducts a theoretical and experimental examination of spark formation processes in both gas and dielectrics. This analysis takes place during the identification of both through and non-through defects in dielectric coatings on conductive substrates. The principles of selecting the test voltage for the investigated dielectric coatings, considering the need to detect both through defects and inadmissible thinning, are theoretically and experimentally justified. It is suggested to utilize a probabilistic approach for evaluating the detectability of the mentioned defects. It is demonstrated that, when the dielectric strength of the coating is known, it is feasible to identify both through and non-through defects in coatings with a calculated probability under a specified test voltage. The conditions of occurrence of partial discharges in the process of testing are investigated, and measures to suppress their influence on the inspection results are proposed. The influence of the substrate surface roughness on the magnitude of the breakdown voltage during testing is considered.

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“…При проектировании таких установок для обеспечения оптимального режима их работы следует наилучшим образом согласовать электрические параметры преобразователя частоты и индуктора, являющегося его активно-индуктивной комплексной нагрузкой. Особенностью системы индуктор-нагреваемый объект является зависимость ее параметроврезонансной частоты, добротности, импеданса -от удельной проводимости  и удельной магнитной проницаемости  этого объекта, которые, в свою очередь, являются функциями температуры [1,2]. Наиболее резкие изменения в указанных параметрах происходят, когда нагретый объект является ферромагнитным материалом, и его температура проходит через точку Кюри [3].…”

Section: Introductionunclassified

Electromagnetic transducer with spatially-periodical field structure for multi-parameter inspection systems

Горкунов¹,

Borisenko²,

Shaiban³

et al. 2018

Bulletin of the National Technical University «KhPI» Series: New Solutions in Modern Technologies

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АННОТАЦИЯ В работе рассмотрена проблема контроля параметров металлических изделий при воздействии на них электромагнитного поля индукционных установок. В качестве датчика рассмотрен электромагнитный преобразователь с пространственно-периодической структурой поля, представляющий собой соленоид на немагнитном полимерном каркасе с контролируемым объектом в форме протяженного цилиндрического ферромагнитного сердечника. Показано, что такой датчик позволяет бесконтактно измерять электропроводность, магнитную проницаемость и геометрические параметры металлических изделий. Ключевые слова: электромагнитный преобразователь; пространственно-периодическая структура электромагнитного поля; электропроводность; магнитная проницаемость.

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On the Question of Non-Destructive Testing and Technical Diagnostics in Russia

Cited by 7 publications

References 0 publications

Study of the Possibility of Estimating the Size of the Fractional-Dimensional Surface Layer by Electromagnetic Methods

Study of the Possibility of Estimating the Size of the Fractional-Dimensional Surface Layer by Electromagnetic Methods

Improvement of Methods and Devices for Multi-Parameter High-Voltage Testing of Dielectric Coatings

Electromagnetic transducer with spatially-periodical field structure for multi-parameter inspection systems

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