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Ultrasonic Guided Wave Testing on Cross-Ply Composite Laminate: An Empirical Study.

Gerardo Aranguren1, Josu Etxaniz1, Sergio Cantero-Chinchilla2

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Summary

This study enhances guided ultrasonic wave testing (UGWT) for composite structures by increasing signal energy. This improves defect detection in aeronautical applications by making low-amplitude signals easier to distinguish from noise.

Keywords:
composite materialpiezoelectric wafer active sensorsstructural health monitoringultrasonic guided wave testing

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-destructive Testing

Background:

  • Structural health monitoring (SHM) is crucial for detecting defects in structures.
  • Guided ultrasonic wave testing (UGWT) is a viable SHM technique, but faces challenges with composite materials due to wave attenuation and anisotropic propagation.
  • Low signal amplitudes in UGWT of composites are difficult to distinguish from noise.

Purpose of the Study:

  • To analyze guided wave propagation in cross-ply composite laminates.
  • To compare different UGWT implementations using piezoelectric wafer active sensors.
  • To enhance signal processing by increasing transmitted energy for improved defect detection.

Main Methods:

  • Empirical analysis of guided wave propagation in a cross-ply composite laminate.
  • Comparison of UGWT configurations, including single-sensor nominal voltage, increased energy emission, and delayed multiple emissions in multisensor tests.
  • Focus on piezoelectric wafer active sensors for wave generation and reception.

Main Results:

  • Investigated wave propagation characteristics and signal attenuation in various directions.
  • Demonstrated that increased energy transmission and delayed multiple emissions can yield higher amplitude echoes.
  • Identified configurations that facilitate easier signal processing for defect detection.

Conclusions:

  • Optimizing UGWT energy transmission is key to overcoming signal attenuation and noise challenges in composite structures.
  • The findings support the development of more effective SHM systems for aeronautical composite applications.
  • Advanced UGWT strategies can significantly improve the reliability of detecting structural defects.