Model-Based Ultrasonic Flaw Classification and Sizing
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  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) . 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.
KeywordsClassification Information Circular Crack Spherical Harmonic Function Ultrasonic Flaw Crack Case
Unable to display preview. Download preview PDF.
- 1.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.CrossRefGoogle Scholar
- 2.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.Google Scholar
- 3.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.Google Scholar