1. Detection and measurement of crack closure and opening by an ultrasonic method
2. 2) Fuji, T., Ootsuka, Y. and Kato, I. : Ultrasonic testing of partial penetration weld, J. JSNDI, Vol.21, No.9, pp.564-565, 1972. (in Japanese)
3. 3) Silk, M. G. : Sizing crack-like defects by ultrasonic means, Research Techniques in Nondestructive Testing, Academic Press, Vol.3, pp.51-99, 1977.
4. 4) Harumi, K., Ogura, Y., Miyajima, T. and Uchida, M. : Motion picture of tip waves, J. JSNDI, Vol.38, No.9, pp.849-850, 1989. (in Japanese)
5. 5) Harumi, K. and Uchida, M. : Computer simulation of ultrasonics and its applications, J. NDE, Vol.9, pp.81-99, 1990.