Technical Diagnostics and Non-Destructive Testing, 2025, №02

2025 №02 (01)

DOI of Article 10.37434/tdnk2025.02.02

2025 №02 (03)

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"Tekhnichna Diahnostyka ta Neruinivnyi Kontrol" (Technical Diagnostics and Non-Destructive Testing) #2, 2025, pp. 12-17

Research of the eddy-current resonance method for measuring the thickness of the carbon fiber reinforced plastic layer on metallic structures

V.N. Uchanin¹, O.G. Aleschenko¹, A. Savin², V.Ja. Derecha³

¹G.V. Karpenko Physico-Mechanical Institute of the NAS of Ukraine. 5 Naukova Str., 79060, Lviv, Ukraine. E-mail: vuchanin@gmail.com
²Nondestructive Testing Department, National Institute of Research and Development for Technical Physics, Iasi, Romania. E-mail: asavin@phys-iasi.ro
³SE «ANTONOV». 1 Mrija Str., 03062, Kyiv, Ukraine

The possibility of non-contact measurement of a carbon fiber reinforced plastic (CFRP) layer on structures made of non-magnetic aluminum alloy and ferromagnetic steel by the eddy current method in resonance mode was investigated. The research was carried out using flat specimens made of aluminum alloy D16T and ferromagnetic steel St20, on which a set of 1 mm thick flat plates made of CFRP were tightly laid. Investigated parametric type eddy current probes (ECP) have windings with 300 and 600 turns installed on an 8 mm diameter ferrite core (magnetic permeability – 600). The ECP output voltages were investigated in the resonant mode at operating frequencies of 5, 8,5 and 20 kHz. The obtained dependences of the output voltage on the thickness of the CFRP layer became the basis for development of a device for non-contact measurement of the CFRP layer thickness on products and structures made of aluminum alloys in the range of thicknesses up to 12 mm and ferromagnetic steel in the range of thicknesses up to 15 mm. The ability to measure the CFRP layer on metal structures is relevant not only for non-destructive inspection of their quality during production, but also for monitoring the integrity of such layered structures during their operation. Operational monitoring envisages preliminary determination of the thickness of CFRP layer in the reference points with the purpose of their further use as reference values. An increase in the results of measuring the thickness of the CFRP layer in the reference points during monitoring relative to the reference values will indicate the formation of delamination at the «metal– CFRP» boundary or between individual CFRP layers in operation.
Keywords: carbon fiber reinforced plastic, aluminum alloy, ferrous steel, eddy current probe, thickness measurement, resonant mode, operating frequency

Received: 07.04.25
Received in revised form: 17.04.25
Accepted: 12.05.25

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