Abstract
The problem of flaw characterization can be viewed as a multi-step process (Fig. 1) where decisions are made as to flaw type (a classification process) and geometry (a sizing process). Previously, we have described our work on the use of the expert system FLEX for determining if an unknown flaw is a volumetric flaw or a crack [1] and the use of equivalent flaw sizing algorithms whereby the flaw is sized in terms of a best fit ellipsoid (for volumetric flaws) or ellipse (for cracks) [2]. Here, we will describe some of our work on how classification information can be used to improve sizing estimates and on the use of new, more efficient sizing algorithms.
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References
Schmerr, L. W., Christensen, K. E., Nugen, S. M., Koo, L. S., and C. P. Chiou, “Ultrasonic Flaw Classification–An Expert System Approach,” Review of Proeress in Quantitative Nondestructive Evaluation, D. O. Thompson and D. E. Chimenti, eds, Vol. 8A, Plenum Press, New York, 657–664, 1989.
Schmerr, L. W., Sedov, A. and C. P. Chiou, “A Unified Constrained Inversion Model for Ultrasonic Flaw Sizing,” Res. Nondestr. Eval., Vol. 1, 77–97, 1989.
Hsu, D. K. Thompson, D. O., and S. J. Wormley, “Reliability of Arbitrarily Oriented Flaws Using Multiview Transducer,” IEEE Trans. Ultrasonics, Ferroelectrics and Frequency Control, Vol. UFFC-34, 508–514, 1987.
Borden, B., “A Vector Inverse Algorithm for Electromagnetic Scattering,” SIAM J. Appl. Math, Vol. 44, 618–626, 1984.
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Schmerr, L.W., Chiou, CP., Nugen, S.M. (1990). Model-Based Ultrasonic Flaw Classification and Sizing. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5772-8_13
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DOI: https://doi.org/10.1007/978-1-4684-5772-8_13
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