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

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

Transactions on Aerospace Research
Volume 2024 (2024): Issue 2 (June 2024)
By: Valentyn Uchanin  
Open Access
|Jun 2024

Figures & Tables

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 typeDECP, mmDf, mmWeWsLe , μHLs , mH
MDF 06016.01.01853603201.2
MDF 08018.01.852154169403.7

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 typeMDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601
Tlc, mm3.02.52.01.51.00.5
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 typeMDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601
Tlc, mm3.02.52.01.51.00.5
Dlc , mm
2.0+-+-+-+-+---
3.0+±+-+-+-+-±-
5.0+++±+±+±+-±-

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

EC probe typeMDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601
hr, mm0.51.01.52.02.53.0
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 typeMDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601MDF 0801MDF 0601
Tlc, mm3.02.52.01.51.00.5
Dlc , mm
2.0++++++++++++
3.0++++++++++++
5.0++++++++++++
DOI: https://doi.org/10.2478/tar-2024-0009 | Journal eISSN: 2545-2835
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Language: English
Page range: 20 - 32
Submitted on: Dec 7, 2023
|
Accepted on: Mar 25, 2024
|
Published on: Jun 12, 2024
Published by: ŁUKASIEWICZ RESEARCH NETWORK – INSTITUTE OF AVIATION
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
multilayer aircraft structure,
corrosion damage,
pitting,
corrosion pit,
eddy current method
Related subjects:
Engineering,
Introductions and overviews,
Engineering, other,
Geosciences,
Geosciences, other,
Materials sciences,
Materials sciences, other,
Physics,
Physics, other

© 2024 Valentyn Uchanin, published by ŁUKASIEWICZ RESEARCH NETWORK – INSTITUTE OF AVIATION
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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