Structural defect parameters assessment of composite materials using thermal imaging and eddy current non-destructive testing equipment

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The possibility of determining the size of the delamination region and the depth of its location in non-metallic multilayer low-conductivity materials using the developed pulsed eddy current equipment by analyzing changes in the amplitude-time distribution of differential signals along the scan line is provided. A method for obtaining information on the shape and size of delaminations based on the use of a non-stationary thermal method of non-destructive testing is also provided. The effectiveness of the proposed methods for assessing the parameters of discontinuities in composite materials, as well as the productivity of the selected technical solutions is confirmed by the results of experimental studies conducted on samples of carbon fiber composite materials with artificially created structural defects in the form of delaminations of various sizes and shapes.

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作者简介

B. Chichigina

National Research University MPEI; JSC VNIIAES

编辑信件的主要联系方式.
Email: boris_ch@mail.ru
俄罗斯联邦, Krasnokazarmennaya Str., 14. Build. 1, Moscow, 111250; Ferganskaya Str., 25, Moscow, 109507

D. Malushin

National Research University MPEI

Email: boris_ch@mail.ru
俄罗斯联邦, Krasnokazarmennaya Str., 14. Build. 1, Moscow, 111250

A. Kokurov

JSC Tupolev; Mechanical Engineering Research Institute of RAS

Email: boris_ch@mail.ru
俄罗斯联邦, Academician Tupolev Embankment, 17, Moscow, 105005; Maly Kharitonyevsky Lane, 4, Moscow, 101000

D. Subbotin

National Research University MPEI; JSC Tupolev

Email: boris_ch@mail.ru
俄罗斯联邦, Krasnokazarmennaya Str., 14. Build. 1, Moscow, 111250; Academician Tupolev Embankment, 17, Moscow, 105005

参考

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2. Fig. 1. Informative features of the differential eddy current signal (light circles) on the time dependence of the signal amplitude (solid curve).

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3. Fig. 2. Object state planes for determining the magnitude and location of structural heterogeneity within a multilayer material at heterogeneity values of 20 (1), 40 (2), 60 (3), 80 (4) and 100 µm (5).

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4. Fig. 3. Block diagram (a) and external view (b) of the excitation system with a special-shaped voltage generator.

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5. Fig. 4. Shapes of output voltages of various generators: 1 - excitation voltage (meander), 2 - excitation voltage of special shape.

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6. Fig. 5. Comparison of current and voltage curves in the circuits of a conventional pulse generator (a): voltage (1) and current (2) in the excitation coil, and comparison of the current of a special excitation generator (b) at special (1) and rectangular (2) forms of excitation voltage.

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7. Fig. 6. Overhead absolute transmitter, which is a component unit of a differential transmitter.

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8. Fig. 7. Identification of defects in the structure of laminated composites using pulsed eddy current nondestructive testing for samples 1 (a), 2 (b), 3 (c) and 4 (d), the defect areas are coloured.

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9. Fig. 8. Thermograms of samples 1 (a), 2 (b), 3 (c) and 4 (d) and the determined optimal heating durations: Δtopt = 3.5 (a, c) and 2.5 (b, d).

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