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Detecting and Estimating Local Corrosion Damages in Long-Service Aircraft Structures by the Eddy Current Method with Double-Differential Probes

Valentyn Uchanin
Valentyn Uchanin
   | 12 jun 2024
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Article Category: research article
Publicado en línea: 12 jun 2024
Páginas: 20 - 32
Recibido: 07 dic 2023
Aceptado: 25 mar 2024
DOI: https://doi.org/10.2478/tar-2024-0009
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© 2024 Valentyn Uchanin, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Hard-to-inspect double-layer ASs with uniform CD situated on the bottom surface of the first (top) layer (a) or top surface of the second layer (b); and local CD (pitting) situated on the bottom surface of the first (top) layer (c): 1 – skin; 2 – CD; 3 – dielectric coatings or sealants.
Hard-to-inspect double-layer ASs with uniform CD situated on the bottom surface of the first (top) layer (a) or top surface of the second layer (b); and local CD (pitting) situated on the bottom surface of the first (top) layer (c): 1 – skin; 2 – CD; 3 – dielectric coatings or sealants.

Fig. 2.

Evaluated stringer-skin type joints with local CDs, where 1 – stringer; 2 – cladding; 3 – rivets; 4 – local CD (a) and detected local CD (b)
Evaluated stringer-skin type joints with local CDs, where 1 – stringer; 2 – cladding; 3 – rivets; 4 – local CD (a) and detected local CD (b)

Fig. 3.

EC signal in the complex plane (hodographs) created by 2.0 mm diameter local CD for surface location (a), and created by subsurface 2.0 mm diameter local CDs with residual thicknesses 0.5 mm (b); 1.0 mm (c); 1.5 mm (d); 2.0 mm (e); and 2.5 mm (f)
EC signal in the complex plane (hodographs) created by 2.0 mm diameter local CD for surface location (a), and created by subsurface 2.0 mm diameter local CDs with residual thicknesses 0.5 mm (b); 1.0 mm (c); 1.5 mm (d); 2.0 mm (e); and 2.5 mm (f)

Fig. 4.

Dependences of EC signal amplitude U (a) and phase angle φ (b) created by local CD on the residual thickness hr for EC probes of MDF 0601 (●) and MDF 0801 (○) types
Dependences of EC signal amplitude U (a) and phase angle φ (b) created by local CD on the residual thickness hr for EC probes of MDF 0601 (●) and MDF 0801 (○) types

Parameters of investigated EC probes

EC probe type DECP, mm Df, mm We Ws Le , μH Ls , mH
MDF 0601 6.0 1.0 185 360 320 1.2
MDF 0801 8.0 1.85 215 416 940 3.7

Detectability of local CD situated in the second layer during inspection through the upper 2.2 mm thick skin using MDF 0801 and MDF 0601 type EC probes

EC probe type MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601
Tlc, mm 3.0 2.5 2.0 1.5 1.0 0.5
Dlc , mm
2.0 + ± + ± + ± + ± + - + -
3.0 + + + + + + + + + ± + -
5.0 + + + + + + + + + ± + -

Detectability of local CD situated in the second layer during inspection through the upper 2.8 mm thick skin using MDF 0801 and MDF 0601 type EC probes

EC probe type MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601
Tlc, mm 3.0 2.5 2.0 1.5 1.0 0.5
Dlc , mm
2.0 + - + - + - + - + - - -
3.0 + ± + - + - + - + - ± -
5.0 + + + ± + ± + ± + - ± -

Detectability of local CDs using MDF 0801 and MDF 0601 EC probes

EC probe type MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601
hr, mm 0.5 1.0 1.5 2.0 2.5 3.0
Dlc, mm
2.0 + + + + + + + - + - - -
3.0 + + + + + + + - + - - -
5.0 + + + + + + + ± + - ± -

Detectability of local CD situated in the second layer during inspection through the upper 1.6 mm thick skin using MDF 0801 and MDF 0601 type EC probes

EC probe type MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601 MDF 0801 MDF 0601
Tlc, mm 3.0 2.5 2.0 1.5 1.0 0.5
Dlc , mm
2.0 + + + + + + + + + + + +
3.0 + + + + + + + + + + + +
5.0 + + + + + + + + + + + +
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