Crack Length Determination by Ultrasonic Methods
Accurate calculation of the stress intensity factor on a given component under load relies on an accurate size determination of the flaws present in the component. The challenge to the NDE community has been development of reliable techniques to provide that accurate size determination. Many research groups have investigated this problem using ultrasonic methods with summaries of their techniques and results provided by various authors [1–3]. In general, the techniques developed fall into three general categories; (1) determination of crack length from signal amplitude measurements, (2) determination of crack length from time-of-flight measurements, and (3) determination of crack length using diffracted waves. Sketches of representative techniques in each category are shown in Figure 1.
KeywordsFatigue Attenuation Cali
Unable to display preview. Download preview PDF.
- 1.J.M. Coffey, in The Measurement of Crack Length and Shape During Fracture and Fatigue, edited by C. J. Beevers ( Chameleon Press, Ltd., London, 1980 ) p. 345.Google Scholar
- 2.O. Buck and B. R. Tittman, in Advances in Crack Length Measurement, edited by C. J. Beevers ( Chameleon Press, Ltd., London, 1982 ) p. 413.Google Scholar
- 3.O. Buck, in Fracture Mechanics: Microstructure and Micromechanisms, edited by S. V. Nair, J. K. Tien, R. C. Bates and O. Buck ( American Society for Metals, Metals Park, OH, 1987 ) p. 31.Google Scholar
- 4.R. F. Lumb, R. J. Hudgell and P. Winship, in Proceedings 7th International Conference on NDT, Paper H-01, Warsaw, 1973.Google Scholar
- 5.M. G. Silk, in Research Techniques in Nondestructive Testing, Vol. 3, Academic Press, London and New York, 1977, p. 51.Google Scholar