11 May 2016 A comparative study of experimental and finite element analysis on submillimeter flaws by laser and ultrasonic excited thermography
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Abstract
Stitching is used to reduce dry-core and reinforce T-joint structure. However, it might cause new types of flaws, especially submillimeter flaws. In this paper, new approaches including micro-VT, lock-in micro-LLT and micro-LST based on both lock-in and pulse methods are used to detect submillimeter flaws in stitched CFRP. A comparison of laser excitation thermography and micro-VT on micro-porosities is conducted. Micro-CT is used to validate the infrared results. 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 comprehensive experimental and simulation comparison of micro-LLT and micro-LST based on both lock-in and pulse methods is conducted.
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Hai Zhang, Henrique Fernandes, Lingyao Yu, Ulf Hassler, Marc Genest, François Robitaille, Simon Joncas, Yunlong Sheng, Xavier Maldague, "A comparative study of experimental and finite element analysis on submillimeter flaws by laser and ultrasonic excited thermography", Proc. SPIE 9861, Thermosense: Thermal Infrared Applications XXXVIII, 98611A (11 May 2016); doi: 10.1117/12.2223209; https://doi.org/10.1117/12.2223209
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