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Thermography has been shown to be a viable technique for inspection of composites. The quadrupole method is a valuable technique for rapidly simulating the thermal response of layered systems. Often, the effort has focused on a one-dimensional model, in particular for improved analysis of thermal data. For composites, the in-plane heat diffusion often significantly impacts the thermal response of defects of interest, therefore three-dimensional simulations are desirable. This paper discusses the extension of the quadrupole methodology to perform simulations of thermographic responses in three-dimensional configurations. This enables the more realistic simulations of the thermal response of delaminations in composites. The simulations are compared to finite element simulations of the same inspection configurations.
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William P. Winfree, Joseph N. Zalameda, Patricia A. Howell, "Quadrupole simulations of three-dimensional structures," Proc. SPIE 11409, Thermosense: Thermal Infrared Applications XLII, 114090K (4 May 2020); https://doi.org/10.1117/12.2557417