Measurement of the fiber orientation and areal weight along with discontinuity detection in a carbon fiber composite are crucial in under-standing the load carrying capability of the structure. Manufacturing conditions including resin flow and molding pressures can alter fiber orientation, and hand or robotic fiber layup processes can be difficult to certify. Verification of the as-designed fiber layup thus becomes necessary to ensure optimal performance of the structure. In this work, the application of eddy current techniques for analysis of carbon fiber composites is presented. A proposed transmit-receive eddy current probe is modeled, and its response to an anisotropic multi-layer conductor simulated and compared to experimental data. The inductively coupled single-sided measurement enables composite characterization through the thickness of the part. The capabilities of eddy current analysis for advanced composites will be shown, and an inversion algorithm to enable determination of layup and impact damage across a composite structure will be presented. The fast and cost-effective technique can be applied as a spot check or as a surface map of the composite properties across the structure.
Allen, J.L., A.T. Adams, W.J. Gajda, R.E. Heintz, W.F. Walker, O. Graham, and J.E. Erickson, 1978, “Electromagnetic Properties and Effects of Advanced Composite Materials: Measurement and Modeling,” Phase Report, RADC-TR-78-156, ADA 058041.
Arao, Y., J. Koyanagi, S. Utsunomiya, and H. Kawada, 2011, “Effect of Ply Angle Misalignment on Out-of-Plane Deformation of Symmetrical Cross-Ply CFRP Laminates: Accuracy of the Ply Angle Alignment,” Composite Structures, Vol. 93, No. 4, pp. 1225–1230.
Combettes, P.L., 1993, “The Foundations of Set Theoretic Estimation,” Proceedings of the IEEE, Vol. 81, No. 2, pp. 182–208.
Fast, T., A.E. Scott, H.A. Bale, and B.N. Cox, 2015, “Topological and Euclidean Metrics Reveal Spatially Nonuniform Structure in the Entang lement of Stochastic Fiber Bundles,” Journal of Materials Science, Vol. 50, No. 6, pp. 2370–2398.
Libby, H.L., 1971, Introduction to Electromagnetic Nondestructive Test Methods, Wiley, New York, NY.
Menana, H., and M. Féliachi, 2010 “Modeling the Response of a Rotating Eddy Current Sensor for the Characterization of Carbon Fiber Reinforced Composites,” European Physical Journal: Applied Physics, Vol. 52, No. 2, doi: 10.1051/epjap/2010079.
ASNT, 1986, Nondestructive Testing Handbook, Second Edition, Vol 4: Elec-tromagnetic Testing, American Society for Nondestructive Testing, Columbus, OH, pp. 22-51.
Sabbagh, H.A., R.K. Murphy, E.H. Sabbagh, J.C. Aldrin, and J.S. Knopp, 2013, Computational Electromagnetics and Model-Based Inversion: A Modern Paradigm for Eddy-Current Nondestructive Evaluation, Springer-Verlag, New York, NY.
Schrader, A., and D. Kenick, 2015, “Understanding the Influence of Fiber Orientation On Structural Analysis of Fiber-Filled Parts,” Composites World, accessed 1 June 2015, at: https://www.compositesworld.com/articles/understanding-the-influence-of-fiber-orientation-on-structural-analysis-of-fiber-filled-parts.
Treece, J.C., H.A. Sabbagh, and B.F. Shamee, 1990, “Sabbagh Associates Technical Report SA/TR- 1/90, Final Report: Eddy-Current Detection of Prepreg FAWT,” Sabbagh Associates Inc.
Washabaugh, A., C. Martin, R. Lyons, D. Grundy, N. Goldfine, R. Russell, R. Wincheski, and V. Zilberstein, 2013, “NDT and SHM of Carbon Fiber Composites Using Linear Drive Mwm-Arrays,” 24th Advanced Aerospace Materials and Processes (AeroMat) Conference and Exposition, American Society of Metals, Bellevue, WA.
Wincheski, B., and J. Simpson, 2006, “Application of Eddy Current Tech-niques for Orbiter Reinforced Carbon-Carbon Structural Health Moni-toring,” AIP Conference Proceedings, Vol. 820, No. 1, pp. 1082–1089.
Wincheski, R., S. Zhao, and L. Berger, 2016, “Fiber Orientation Assessment on Laminated Carbon Fiber Composites Using Eddy Current Probe,” The American Society for Composites: 31st Technical Conference, Williamsburg, VA.
Wincheski, R.A., and S. Zhao, 2018, “Development of Eddy Current Probe for Fiber Orientation Assessment in Carbon Fiber Composites,” AIP Conference Proceedings, Vol. 1949, No. 1, doi: 10.1063/1.5031591.
Wisnom, M.R., 1990, “The Effect of Fibre Misalignment on the Compres-sive Strength of Unidirectional Carbon Fibre/Epoxy,” Composites, Vol. 21, No. 5, pp. 403–407.
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