An experimental and analytical study of micro-laser line thermography on micro-sized flaws in stitched carbon fiber reinforced polymer composites. (1st April 2016)

• Record Type: Journal Article
• Authors: Zhang, Hai; Yu, Lingyao; Hassler, Ulf; Fernandes, Henrique; Genest, Marc; Robitaille, François; Joncas, Simon; Holub, Wolfgang; Sheng, Yunlong; Maldague, Xavier
• Is Part Of: Composites science and technology. Volume 126(2016)
• Page Start: 17
• Page End: 26
• Publication Date: 2016-04-01
• Subjects: NDT -- Laser line thermography -- X-ray computed tomography -- Finite element method -- Composite stitching; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2016.02.007
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: 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.