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Proceedings Paper

Simulation of thermographic responses of delaminations in composites with quadrupole method
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Paper Abstract

The application of the quadrupole method for simulating thermal responses of delaminations in carbon fiber reinforced epoxy composites materials is presented. The method solves for the flux at the interface containing the delamination. From the interface flux, the temperature at the surface is calculated. While the results presented are for single sided measurements, with ash heating, expansion of the technique to arbitrary temporal flux heating or through transmission measurements is simple. The quadrupole method is shown to have two distinct advantages relative to finite element or finite difference techniques. First, it is straight forward to incorporate arbitrary shaped delaminations into the simulation. Second, the quadrupole method enables calculation of the thermal response at only the times of interest. This, combined with a significant reduction in the number of degrees of freedom for the same simulation quality, results in a reduction of the computation time by at least an order of magnitude. Therefore, it is a more viable technique for model based inversion of thermographic data. Results for simulations of delaminations in composites are presented and compared to measurements and finite element method results.

Paper Details

Date Published: 11 May 2016
PDF: 14 pages
Proc. SPIE 9861, Thermosense: Thermal Infrared Applications XXXVIII, 98610N (11 May 2016); doi: 10.1117/12.2221994
Show Author Affiliations
William P. Winfree, NASA Langley Research Ctr. (United States)
Joseph N. Zalameda, NASA Langley Research Ctr. (United States)
Patricia A. Howell, NASA Langley Research Ctr. (United States)
K. Elliott Cramer, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 9861:
Thermosense: Thermal Infrared Applications XXXVIII
Joseph N. Zalameda; Paolo Bison, Editor(s)

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