Ultrasonic shear wave technique for sensitive detection and sizing of small closed cracks

M. A.Salam Akanda, Masumi Saka

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


This paper describes an experimental investigation on the ultrasonic nondestructive evaluation of small cracks in the size range of 0.25 to 3 mm. The cracks treated are 0.1 mm-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.

Original languageEnglish
Pages (from-to)252-261
Number of pages10
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Issue number2
Publication statusPublished - 2002 Apr


  • Optimum incidence
  • Sensitivity
  • Small closed cracks
  • Ultrasonic NDE

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering


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