An Eddy-Current Model for Three-Dimensional Nondestructive Evaluation of Advanced Composites
Abstract
The research problem is to develop a model and an inversion algorithm suitable for the three-dimensional quantitative nondestructive evaluation (NDE) of advanced composite materials by using eddy currents. The technical objectives are to determine the feasibility of using multifrequencies for this job, to determine in localized regions the fiber-resin ratio in graphite epoxy, and to determine more precisely the types of anomalies, whether flaws, delaminations, broken fibers, etc., that can be reconstructed by the inversion method. These objectives are met by: (1) applying rigorous electromagnetic theory to determine a Green's function for a slab of anisotropic composite material, (2) determining the integral relations for the direct and inverse problems using the Green's function just derived, (3) determining suitable numerical algorithms for solving the inverse problem, and (4) writing a computer program to execute the model. These objectives have been met; in addition we illustrate some interesting electromagnetic phenomena in composite materials.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 28, 1985
- Accession Number
- ADA167688
Entities
People
- Harold A. Sabbagh
- L. David Sabbagh
- Thomas M. Roberts