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

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1117/1.OE.54.10.104109
Author	Search for: Zhang, Hai; Search for: Hassler, Ulf; Search for: Genest, Marc¹; Search for: Fernandes, Henrique; Search for: Robitaille, Francois; Search for: Ibarra-Castanedo, Clemente; Search for: Joncas, Simon; Search for: Maldague, Xavier
Affiliation	National Research Council of Canada. Aerospace
Format	Text, Article
Subject	Carbon fiber reinforced plastics; Computerized tomography; Defects; Fiber reinforced plastics; Microporosity; Nondestructive examination; Polymer matrix composites; Pulsed lasers; Reinforced plastics; Reinforcement; Thermography (imaging); Tomography; Ultrasonic applications; Ultrasonic testing; Carbon fiber reinforced polymer; Laser lines; Laser spot thermographies; Micro computed tomography (micro-CT); Microcomputed tomography; T-joints; Ultrasonic C-scan; X-ray computed tomography; Thermography (temperature measurement)
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 54 μm 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 90 μm. 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.
Publication date	2015-10-15
In	Optical Engineering 54, no. 10, 104109 (15 October 2015).
Language	English
Peer reviewed	Yes
NPARC number	21276965
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Record identifier	42ac7608-43dd-415f-b4ba-7ab02c497bc9
Record created	2015-11-10
Record modified	2020-04-22

Date modified:: 2024-10-10