10.14489/td.2017.12.pp.042-047

2017, 12 December

DOI: 10.14489/td.2017.12.pp.042-047

Kuznetsov A. O., Kozelskaya S. O., Shchiptsov V. S., Abramova E. V.
DEVELOPMENT OF EDDY CURRENT TECHNOLOGY AND INSTRUMENTATION FOR DETECTING AND DETERMINING OCCURRENCE DEPTH OF SMALL-SIZED METAL INCLUSIONS IN POLYMER COMPOSITE MATERIAL
(pp. 42-47)

Abstract. Technology and instrumentation of eddy current testing for detecting and determining the occurrence depth of small-sized metal inclusions in polymer composite materials have been developed. The developed technology and instrumentation can be used to detect and to determine the occurrence depth up to 20 mm, with an error not more than 0.3 mm, for metal inclusions up to 0.5 mm in polymer composite products both during production and in the process of operation. Existing technologies of non-destructive testing (NDT) by different methods (radiation NDT, ultrasonic NDT), as a rule, do not provide the required testing accuracy, detection truth and output. The analysis of up-to-date state of eddy current technology and instrumentation which showed the absence of instruments providing the solution of the stated problem was conducted. On the basis of studies, the physical-mathematical model of distributing the electromagnetic field, the most suitable for the stated problem, was selected. It considers the electromagnetic field of a turn with harmonic current arranged near an oblate and extended spheroid. The main point of this technology is in using the eddy current thickness gauge with a probe containing a ferrite core which provides the increase of the generated magnetic field at the expense of its physical properties. In order to analyze an influence of the ferrite core on testing results, the problem on the distribution of the electromagnetic field of a turn with harmonic current arranged near an extended spheroid was modeled in the COMSOL Multiphysics environment. In that way the selected parameters of the eddy current probe were confirmed. The locuses of complex impedance of the eddy current probe when changing a quantity of the occurrence depth of metal inclusions, which graphically show the sensitivity of ridings of the instrument to the measurable quantity, have been obtained. The experimental studies which showed that the developed instrument meets the stated problems and makes it possible to find metal inclusions up to 0.5 mm in polymer composite materials with an occurrence-depth determination error of 0.3 mm have been conducted.

Keywords: eddy current testing, composite materials, COMSOL Multiphysics, magnetic fields, quality.

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A. O. Kuznetsov, S. O. Kozelskaya (Central Research Institute for Special Machinery, Joint Stock Company (CRISM JSC), Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
V. S. Shchiptsov (Mashproyekt Scientific-Production Enterprise (MASHPROYEKT SPE), Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
E. V. Abramova (“Welding and Testing” of MSTU n.a. Bauman, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

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