Method for detecting damage in carbon-fibre reinforced plastic-steel structures based on eddy current pulsed thermography

Journal article (2016)

Authors

X Li Wuhan University of Technology

Zhengyu Liu Wuhan University of Technology

X. Jiang Transport Engineering and Logistics - Mechanical, Maritime and Materials Engineering

G. Lodewijks Transport Engineering and Logistics - Mechanical, Maritime and Materials Engineering

Research Group

Transport Engineering and Logistics (Mechanical, Maritime and Materials Engineering) (TU Delft)

Image fusion Wavelet transform Infrared thermography Electromagnetic excitation Carbon fibre-reinforced

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Published Date

2016

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Marine and Transport Technology

Research Group

Transport Engineering and Logistics

Abstract

Eddy current pulsed thermography (ECPT) is well established for nondestructive
testing of electrical conductive materials, featuring the advantages of contactless, intuitive detecting and efficient heating. The concept of divergence characterization of the damage rate of carbon fibre-reinforced plastic (CFRP)-steel structures can be extended to ECPT thermal pattern characterization. It was found in this study that the use of ECPT technology on CFRP-steel structures generated a sizeable amount of valuable information for comprehensive
material diagnostics. The relationship between divergence and transient thermal patterns can be identified and analysed by deploying mathematical models to analyse the information about fibre texture-like orientations, gaps and undulations in these multilayered materials. The developed algorithm enabled the removal of information about fibre texture and the extraction of damage features.
The model of the CFRP-glue-steel structures with damage was established using COMSOL Multiphysics® software, and quantitative non-destructive damage evaluation from the ECPT image areas was derived. The results of this proposed method illustrate that damaged areas are highly affected by available information about fibre texture.
This proposed work can be applied for detection of impact induced damage and quantitative evaluation of CFRP structures.