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Related Experiment Video

Updated: May 31, 2025

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Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode.

Olgirdas Tumšys1, Lina Draudvilienė1, Egidijus Žukauskas1

  • 1Ultrasound Research Institute, Kaunas University of Technology, LT-51423 Kaunas, Lithuania.

Sensors (Basel, Switzerland)
|January 25, 2025
PubMed
Summary

A new algorithm precisely detects delamination in multilayer structures by analyzing Lamb wave A0 mode velocity dispersion. This method accurately locates and characterizes defects, validated through simulations and experiments on a wind turbine blade segment.

Keywords:
Lamb wavesdelamination parametrizationfinite element modellingnon-destructive testingphase velocity dispersion curvewind turbine bladezero-crossing

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Signal Processing

Background:

  • Delamination in multilayer structures, such as wind turbine blades, can compromise structural integrity.
  • Accurate detection and characterization of delamination are crucial for maintenance and safety.
  • Existing methods may lack the precision required for detailed defect analysis.

Purpose of the Study:

  • To propose and validate a novel signal-processing algorithm for detailed delamination determination in multilayer structures.
  • To utilize Lamb wave A0 mode phase velocity and dispersion for defect analysis.
  • To assess the algorithm's effectiveness through both simulation and experimental studies.

Main Methods:

  • Calculating the phase velocity of the Lamb wave A0 mode.
  • Estimating phase velocity dispersion to determine delamination depth and location.
  • Validating the algorithm using simulations of defect-free and delaminated multilayer structures, including a drilled hole as a defect analog, and experimental testing on a wind turbine blade segment.

Main Results:

  • The algorithm successfully determined the location and edge coordinates of simulated delaminations and defects.
  • Phase velocity dispersion curves effectively estimated delamination depth, with differences of approximately 60 m/s between layers at different depths.
  • Simulation results confirmed that a drilled hole accurately represents delamination for validation purposes, and experimental results matched simulation findings.

Conclusions:

  • The proposed signal-processing algorithm is effective for the detailed determination of delamination parameters in multilayer structures.
  • Lamb wave A0 mode phase velocity dispersion analysis provides a reliable method for defect characterization.
  • The validated algorithm offers a promising tool for non-destructive evaluation of composite materials.