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

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...

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Bibliographic Details
Published in:Composites science and technology 2016-04, Vol.126, p.17-26
Main Authors: Zhang, Hai, Yu, Lingyao, Hassler, Ulf, Fernandes, Henrique, Genest, Marc, Robitaille, François, Joncas, Simon, Holub, Wolfgang, Sheng, Yunlong, Maldague, Xavier
Format: Article
Language:English
Subjects:
Composite stitching
Defects
Finite element method
Infrared
Laser line thermography
Mathematical analysis
Mathematical models
NDT
Stitching
Tee joints
Thermography
X-ray computed tomography
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Summary: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.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2016.02.007