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Crack characterization using guided circumferential waves.

C Valle1, M Niethammer, J Qu

  • 1Department of Mechanical Engineering, University of Maine, Orono 04469-5711, USA.

The Journal of the Acoustical Society of America
|September 27, 2001
PubMed
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This study uses guided waves to detect and size cracks in hollow cylinders. Advanced signal processing techniques improve accuracy and reduce the need for high frequencies, making crack characterization more effective.

Area of Science:

  • Mechanical Engineering
  • Non-Destructive Testing
  • Wave Propagation

Background:

  • Guided circumferential waves are crucial for inspecting hollow structures.
  • Cracks in cylinders can compromise structural integrity.
  • Accurate crack detection and sizing are vital for safety.

Purpose of the Study:

  • To investigate guided circumferential wave propagation in a cracked hollow cylinder.
  • To develop methods for crack localization and sizing using these waves.
  • To demonstrate the efficacy of advanced digital signal processing (DSP) for crack characterization.

Main Methods:

  • Generating guided circumferential waves using finite element method (FEM) simulations.
  • Sizing cracks with a modified Auld's formula based on reflected energy.

Related Experiment Videos

  • Locating cracks using time-frequency DSP on backscattered signals.
  • Comparing results with a defect-free cylinder model.

    • Main Results:

    • Successful crack sizing and localization were achieved.
    • Advanced DSP techniques effectively characterized scattering effects on dispersive waves.
    • The need for high frequencies to detect small cracks was significantly reduced.

    Conclusions:

    • Guided circumferential waves combined with advanced DSP offer a systematic and accurate method for crack characterization.
    • This approach enhances the non-destructive evaluation of hollow cylinders.
    • The study highlights the potential for improved structural health monitoring.