Depth measurement of short cracks with an acoustic microscope

D. Knauss, D. D. Bennink, T. Zhai, G. A.D. Briggs, J. W. Martin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The depth of short cracks (70-200 μm surface length) has been measured with an acoustic microscope by utilizing the nondestructive time-of-flight diffraction technique (TOFD). The depth measurements were first carried out in the transparent polymer polystyrene, thus allowing a comparison between the acoustical values and direct optical measurements: the agreement in the results was better than 95%. The depth of a 70 μm long crack in an aluminium alloy was then measured, demonstrating the application of the technique to metals.

Original languageEnglish
Pages (from-to)4910-4917
Number of pages8
JournalJournal of Materials Science
Issue number18
StatePublished - Jan 1993

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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