Crack detection by resonant frequency measurements

Shaun M. McGuire*, Morris E. Fine, Jan D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The resonant frequency of 304 stainless steel specimens with a center-drilled hole has been measured as a function of fatigue cycles during crack initiation and propagation. Simultaneous measurements of crack lengths by scanning electron microscopy yield the resonant frequency vs crack length. The change of resonant frequency is equivalent to the change of an effective elastic modulus. Analytical results for a "spring" model to predict the change in effective modulus due to the presence of cracks have been compared with results derived from resonant tests. In the model, the load transfer across the plane of the crack is represented by a distribution of springs of stiffness that depends on the crack length. Good agreement is observed between theory and experiment for cracks up to 500-μm long. The model may be used to obtain the crack length from resonance measurements.

Original languageEnglish (US)
Pages (from-to)1123-1127
Number of pages5
JournalMetallurgical and Materials Transactions A
Issue number5
StatePublished - May 1 1995

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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