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An experimental and analytical study of micro-laser line thermography on micro-sized flaws in stitched carbon fiber reinforced polymer composites

: Zhang, H.; Yu, L.; Hassler, U.; Fernandes, H.; Genest, M.; Robitaille, F.; Joncas, S.; Holub, W.; Sheng, Y.L.; Maldague, X.


Composites science and technology 126 (2016), pp.17-26
ISSN: 0266-3538
Journal Article
Fraunhofer IIS ()

Stitching is used to reduce incomplete infusion of T-joint core (dry-core) and reinforce T-joint structure. However, it might cause new types of flaws, especially micro-sized flaws. In this paper, a new micro-laser line thermography (micro-LLT) is presented. X-ray micro-computed tomography (micro-CT) was used to validate the infrared results. The micro-LLT and micro-CT inspection are compared. Then, a finite element analysis (FEA) is performed. The geometrical model needed for finite element discretization was developed from micro-CT measurements. The model is validated for the experimental results. Finally a comparison of the experiments and simulation is conducted. The infrared experimental phenomenon and results are explained based on the FEA results.