Instrumentation, Techniques, and Measurement

Comparative study on submillimeter flaws in stitched T-joint carbon fiber reinforced polymer by infrared thermography, microcomputed tomography, ultrasonic c-scan and microscopic inspection

[+] Author Affiliations
Hai Zhang, Henrique Fernandes, Clemente Ibarra-Castanedo, Xavier Maldague

Laval University, Department of Electrical and Computer Engineering, Computer Vision and Systems Laboratory, 1065 Avenue de la Medecine, Quebec G1V 0A6, Canada

Ulf Hassler

Fraunhofer IIS, Fraunhofer Development Center X-ray Technologies (EZRT), Department of Application Specific Methods and Systems (AMS), Flugplatzstrasse 75, Fuerth 90768, Germany

Marc Genest

National Research Council Canada, Aerospace Portfolio, Structures, Materials and Manufacturing, 1200 Montreal Road, Ottawa K1A 0R6, Canada

Francois Robitaille

University of Ottawa, Department of Mechanical Engineering, 161 Louis Pasteur, Ottawa K1N 6N5, Canada

Simon Joncas

Ecole de Technologie Superieure, Department of Automated Manufacturing Engineering, 1100 rue Notre-Dame Ouest, Montreal H3C 1K3, Canada

Opt. Eng. 54(10), 104109 (Oct 15, 2015). doi:10.1117/1.OE.54.10.104109
History: Received June 11, 2015; Accepted September 21, 2015
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Abstract.  Stitching is used to reduce dry-core (incomplete infusion of T-joint core) and reinforce T-joint structure. However, it may cause new types of flaws, especially submillimeter flaws. Microscopic inspection, ultrasonic c-scan, pulsed thermography, vibrothermography, and laser spot thermography are used to investigate the internal flaws in a stitched T-joint carbon fiber-reinforced polymer (CFRP) matrix composites. Then, a new microlaser line thermography is proposed. Microcomputed tomography (microCT) is used to validate the infrared results. A comparison between microlaser line thermography and microCT is performed. It was concluded that microlaser line thermography can detect the internal submillimeter defects. However, the depth and size of the defects can affect the detection results. The microporosities with a diameter of less than 54μm are not detected in the microlaser line thermography results. Microlaser line thermography can detect the microporosity (a diameter of 0.162 mm) from a depth of 90μm. However, it cannot detect the internal microporosity (a diameter of 0.216 mm) from a depth of 0.18 mm. The potential causes are given. Finally, a comparative study is conducted.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Hai Zhang ; Ulf Hassler ; Marc Genest ; Henrique Fernandes ; Francois Robitaille, et al.
"Comparative study on submillimeter flaws in stitched T-joint carbon fiber reinforced polymer by infrared thermography, microcomputed tomography, ultrasonic c-scan and microscopic inspection", Opt. Eng. 54(10), 104109 (Oct 15, 2015). ; http://dx.doi.org/10.1117/1.OE.54.10.104109


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