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Scanning tone burst eddy-current thermography (S-TBET) for NDT of carbon fiber reinforced plastic (CFRP) components
M. N. Libin, Bruce W. Maxfield, Krishnan Balasubramanian
Published in American Institute of Physics Inc.
2014
Volume: 1581 33
   
Pages: 1336 - 1343
Abstract
Tone Burst Eddy Current technique uses eddy current to apply transient heating inside a component and uses a conventional IR camera for visualization of the response to the transient heating. This technique has been earliest demonstrated for metallic components made of AL, Steel, Stainless Steel, etc., and for detection of cracks, corrosion and adhesive dis-bonds. Although, not nearly as conducting as metals, the Carbon Fibre Reinforced Plastic (CFRP) material absorbs measurable electromagnetic radiation in the frequency range above 10 kHz. When the surface temperature is observed on the surface that is being heated (defined as the surface just beneath and slightly to one side of the heating coil), the surface temperature increases with increasing frequency because the internal heating increases with frequency. A 2-D anisotropic transient Eddy current heating and thermal conduction model has been developed that provides a reasonable description of the processes described above. The inherent anisotropy of CFRP laminates is included in this model by calculating the heating due to three superimposed, tightly coupled isotropic layers having a specified ply-layup. The experimental apparatus consists of an induction heating coil and an IR camera with low NETD and high frame rates. The coil is moved over the sample using a stepper motor controlled manipulator. The IR data recording is synchronized with the motion control to provide a movie of the surface temperature over time. Several components were evaluated for detection of impact damage, location of stiffeners, etc. on CFRP components. © 2014 AIP Publishing LLC.
About the journal
JournalData powered by TypesetAIP Conference Proceedings
PublisherData powered by TypesetAmerican Institute of Physics Inc.
ISSN0094243X
Open AccessNo
Concepts (24)
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    Anisotropy
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    Atmospheric temperature
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    Cameras
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    Carbon fiber reinforced plastics
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    Composite materials
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    Crack detection
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    Electromagnetic induction
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    Electromagnetic waves
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    Finite element method
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    Heating
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    Laminates
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    Stainless steel
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    Surface properties
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    THERMOGRAPHY (IMAGING)
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    Thermography (temperature measurement)
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    CARBON FIBER REINFORCED PLASTICS (CFRP)
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    CARBON FIBRE REINFORCED PLASTIC (CFRP)
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    EDDY CURRENT TECHNIQUES
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    EXPERIMENTAL APPARATUS
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    INDUCTION HEATING COILS
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    INHERENT ANISOTROPY
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    Surface temperatures
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    TRANSIENT EDDY CURRENTS
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    Eddy current testing