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Improved spectrum method for impact damage characterization in the composite beam using Lamb waves.

Fei Gao1, Jiadong Hua1, Jing Lin2

  • 1School of Reliability and Systems Engineering, Beihang University, Xueyuan Road No.37, Haidian District, Beijing, China; Advanced Manufacturing Center, Ningbo Institute of Technology, Beihang University, Ningbo 315100, China.

Ultrasonics
|December 20, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a cepstrum filtering method to analyze Lamb waves for detecting invisible damage in composite structures. The technique effectively removes reflections, improving the characterization of impact damage severity.

Keywords:
Impact damage characterizationLamb wavesSpectrum filteringStructural health monitoring

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Area of Science:

  • Materials Science
  • Structural Health Monitoring
  • Non-Destructive Testing

Background:

  • Lamb wave spectral methods are used for damage detection in composite structures.
  • Geometric boundary reflections can distort Lamb wave spectra, obscuring damage signatures.
  • Effective methods are needed to filter spectral interference for accurate damage assessment.

Purpose of the Study:

  • To propose a cepstrum-based filtering method to eliminate spectral interference from Lamb wave signals.
  • To establish quantitative relationships between spectral features and impact energy for damage characterization.
  • To demonstrate the effectiveness of the proposed method in identifying impact damage in composite materials.

Main Methods:

  • A cepstrum-based filtering approach was developed to separate direct waves from reflections.
  • An optimized filter was used to extract the fundamental Lamb wave spectrum.
  • Damage indices, including spectrum energy mean and median frequency shift, were introduced.
  • Experiments were conducted on a T300 composite beam subjected to impact damage from a steel ball drop.

Main Results:

  • The cepstrum filtering method successfully removed harmonic fluctuations caused by wave reflections.
  • Extracted fundamental spectrum features showed quantitative relationships with impact energies.
  • The proposed damage indices effectively quantified changes in spectrum intensity and distribution.
  • The method demonstrated improved sensitivity in characterizing impact damage severity.

Conclusions:

  • The cepstrum-based filtering method is effective for eliminating spectral interference in Lamb wave analysis.
  • The developed damage indices provide a quantitative approach to characterize impact damage in composite structures.
  • The study highlights the potential of this technique for enhanced structural health monitoring of composite materials.