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Evaluation of debonding in CFRP-epoxy adhesive single-lap joints using eddy current pulse-compression thermography

Lookup NU author(s): Qiuji Yi, Professor Gui Yun TianORCiD, Bengisu Yilmaz, Hamed Malekmohammadi



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


© 2019. Contaminations arising during the manufacturing or usage of Carbon Fiber Reinforced Plastic (CFRP)-epoxy adhesive single-lap joints can drastically affect the mechanical performance of the structure and eventually lead to its catastrophic failure. Eddy current stimulated thermography has been recently proposed for detecting and characterizing defects in composite materials. The characterization of debonding in adhesive single-lap joints in composites by eddy current stimulated thermography can be challenging due to the anisotropic thermal diffusion caused by the anisotropic conductivity and multi-layer nature of the composites. This work tackles the challenge of detecting the interface contamination by combining eddy current pulse-compression thermography and image post-processing algorithms. The impulse responses from samples containing either brass, release film or release agent contaminations obtained through pulse-compression combined with Eddy Current Pulsed Thermography (ECPT). Non-uniform heating patterns are removed by partial least square technique. Then, the time instants containing meaningful information about the contaminated interface layer are inferred by comparing each norm of kernel principal component over suitable time windows. The evaluation of contamination depths and properties are conducted in selected time windows by principal component analysis and time-phase analysis. Results proved that release agent contamination plays the minor role in changing the electrical and thermal properties of the single-lap joints compared with brass and release film.

Publication metadata

Author(s): Yi Q, Tian GY, Yilmaz B, Malekmohammadi H, Laureti S, Ricci M, Jasiuniene E

Publication type: Article

Publication status: Published

Journal: Composites Part B: Engineering

Year: 2019

Volume: 178

Print publication date: 01/12/2019

Online publication date: 19/09/2019

Acceptance date: 16/09/2019

Date deposited: 12/12/2019

ISSN (print): 1359-8368

ISSN (electronic): 1879-1069

Publisher: Elsevier Ltd


DOI: 10.1016/j.compositesb.2019.107461


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Funder referenceFunder name
722134European Commission