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Metallurgical and Materials Transactions A

, Volume 26, Issue 5, pp 1123–1127 | Cite as

Crack detection by resonant frequency measurements

  • Shaun M. McGuire
  • Morris E. Fine
  • Jan D. Achenbach
Mechanical Behavior

Abstract

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 frequencyvs 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.

Keywords

Fatigue Elastic Modulus Material Transaction Resonant Frequency Crack Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Minerals, Metals & Material Society 1995

Authors and Affiliations

  • Shaun M. McGuire
    • 1
  • Morris E. Fine
    • 2
  • Jan D. Achenbach
    • 3
  1. 1.Commonwealth Aluminum Co., Metallurgical DevelopmentLewisport
  2. 2.Department of Materials Science and EngineeringNorthwestern UniversityEvanston
  3. 3.Center for Quality Engineering and Failure PreventionNorthwestern UniversityEvanston

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