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Comparative study of microlaser excitation thermography and microultrasonic excitation thermography on submillimeter porosity in carbon fiber reinforced polymer composites

 
: Zhang, H.; Fernandes, H.; Hassler, U.; Ibarra-Castanedo, C.; Genest, M.; Robitaille, F.; Joncas, S.; Maldague, X.

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Optical engineering 56 (2017), No.4, Art. 041304
ISSN: 0091-3286
ISSN: 0036-1860
ISSN: 1560-2303
English
Journal Article
Fraunhofer IIS ()

Abstract
Stitching is used to reduce incomplete infusion of T-joint core (dry-core) and reinforce T-joint structure. However, it may cause new types of flaws, especially submillimeter flaws. Thermographic approaches including microvibrothermography, microlaser line thermography, and microlaser spot thermography on the basis of pulsed and lock-in techniques were proposed. These techniques are used to detect the submillimeter porosities in a stitched T-joint carbon fiber reinforced polymer composite specimen. X-ray microcomputed tomography was used to validate the thermographic results. Finally an experimental comparison of microlaser excitation thermography and microultrasonic excitation thermography was conducted.

: http://publica.fraunhofer.de/documents/N-480745.html