Crack length independent evaluation of depth of small surface cracks

S. Reaz Ahmed, Masumi Saka

Research output: Contribution to specialist publicationArticle

6 Citations (Scopus)


Testing the depth of tightly closed small surface cracks is an important practical issue. Recently, the ultrasonic technique has shown its potential for detecting, as well as characterizing, smaller tight cracks under a no load condition. This paper describes a method for quantitative testing of surface cracks from the inaccessible side, where the potential of a novel ultrasonic angle beam technique is used. First, the influence of crack depth and length on the angle beam testing of the cracks is investigated experimentally. Based on observation a crack length independent testing algorithm is developed for simultaneous determination of crack depth and the extent of crack closure by solving an inverse problem. Tested results of open and tightly closed small cracks on the backwall with different crack lengths and depths verify the method as an effective tool for quantitative characterization of small surface cracks in actual structures, independent of crack length.

Original languageEnglish
Number of pages10
Specialist publicationMaterials Evaluation
Publication statusPublished - 2002 Apr 1


  • Crack closure
  • Crack depth
  • Crack length
  • Inverse problem
  • Small surface crack
  • Ultrasonics

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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