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NDT.net Issue - 2019-03 - Articles
NDT.net Issue: 2019-03
Publication: 10th International Symposium on NDT in Aerospace, Oct 2018, Dresden, Germany (AeroNDT 2018)
Session: EU PhD Programme "NDT on Air" (Special Session)
ARTICLE

Quantitative evaluation of delamination depth in CFRP based on pulse compression eddy current pulse thermography

Qiuji Yi14, Gui Yun Tian129, Junzhen ZHU14, Stefano Laureti24, Hamed Malekmohammadi23, Marco Ricci37
1Department of Electrical and Electronic Engineering; University of Newcastle31, Newcastle upon Tyne, United Kingdom
2Dept. of Engineering; University of Perugia ,Terni11, Terni, Italy
3DIMES; University of Calabria (Unical)23, Calabria, Italy

Abstract: With the growing interest to use engineering composite structures, much attention is devoted to the non-destructive testing (NDT) techniques for the evaluation of impact damage and delamination of Carbon Fiber Reinforced Plastic (CFRP). Eddy current pulsed thermography (ECPT) is an emerging NDT technique, which shows significant detectability for impact damage evaluation [1,2]. However, the faithful characterization of possible delamination within a CFRP specimen is hampered by insignificant thermal diffusion reflecting the depth information which cannot be extracted in pulse excitation [3]. To tackle with these challenges, eddy current pulsed thermography was firstly combined with pulse compression technique to increase detectability of delamination. Based on the impulse response retrieved from modulated heating data, this paper proposes the thermal pattern enhancement techniques as the post-processing method to locate and select the defected area and evaluate the feasibility of a new feature extracted from the enhanced thermal pattern to analyze the quantitative relationship of this new feature with delamination depth. References: [1] He, Yunze, et al. "Impact evaluation in carbon fiber reinforced plastic (CFRP) laminates using eddy current pulsed thermography." Composite Structures 109 (2014): 1-7. [2] Liang, Tao, et al. "Low energy impact damage detection in CFRP using eddy current pulsed thermography."Composite Structures 143 (2016): 352-361. [3]Yang, Ruizhen, and Yunze He. "Eddy current pulsed phase thermography considering volumetric induction heating for delamination evaluation in carbon fiber reinforced polymers." Applied Physics Letters 106.23 (2015): 234103.

Keywords: CFRP (73), Quantitative evaluation (5), pulse compression (8), eddy current pulsed thermography (2), Delamination depth,
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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