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Simulation of Thermographic Responses of Delaminations in Composites with Quadrupole MethodThe 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.
Document ID
20160009060
Document Type
Conference Paper
Authors
Winfree, William P.
(NASA Langley Research Center Hampton, VA, United States)
Zalameda, Joseph N.
(NASA Langley Research Center Hampton, VA, United States)
Howell, Patricia A.
(NASA Langley Research Center Hampton, VA, United States)
Cramer, K. Elliott
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
July 15, 2016
Publication Date
April 17, 2016
Subject Category
Numerical Analysis
Composite Materials
Report/Patent Number
NF1676L-22521
Meeting Information
2016 SPIE Defense and Commercial Sensing(Baltimore, MD)
Funding Number(s)
WBS: WBS 826611.04.07.02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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