JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Experimental Mechanics
Ultrasonic Shear Wave Technique for Sensitive Detection and Sizing of Small Closed Cracks
M. A. Salam AKANDAMasumi SAKA
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2002 Volume 45 Issue 2 Pages 252-261

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Abstract

This paper describes an experimental investigation on the ultrasonic nondestructive evaluation of small cracks in the size range of 0.25 to 3mm. The cracks treated are 0.1mm-wide EDM slits (as open cracks) and closed fatigue cracks situated vertically on the back surface of the stainless steel specimens. In order to develop a method for the enhancement of sensitivity of ultrasonic evaluation of small cracks, firstly, the investigating feature and capability of usual ultrasonic techniques, specially, the normal incidence, small-angle incidence and large-angle incidence techniques of longitudinal wave and the large-angle shear wave beam technique are examined based on the open cracks. Then, the effect of incident beam angle of the longitudinal as well as the shear waves on the crack corner echo response is investigated by using a single probe transducer. Finally, the principle of a new angle-beam approach is proposed, where the use of shear wave with incidence around 50° upon the specimen back wall is emphasized. Highly sensitive feature of the present angle-beam approach is realized, especially for small closed cracks, when compared with the above techniques.

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© 2002 by The Japan Society of Mechanical Engineers
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