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Plane Wave SH₀ Piezoceramic Transduction Optimized Using Geometrical Parameters.

Guillaume Boivin1, Martin Viens2, Pierre Belanger3

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This study introduces an optimized piezoelectric transducer for generating pure shear horizontal (SH 0) guided waves. This advancement improves structural health monitoring by enhancing the selectivity of SH 0 waves.

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guided wavespiezoceramicshear horizontal wavesstructural health monitoringtransducerultrasound

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nondestructive Testing

Background:

  • Structural health monitoring (SHM) offers an alternative to scheduled maintenance for critical components.
  • Shear horizontal (SH 0) guided waves are ideal for SHM due to their nondispersive nature and through-thickness mode shape.
  • Exciting pure SH 0 waves is challenging due to interference from other Lamb modes.

Purpose of the Study:

  • To present a novel piezoelectric transducer concept optimized for pure SH 0 wave transduction.
  • To enhance the modal selectivity of SH 0 waves for improved structural health monitoring applications.

Main Methods:

  • Utilized a simple analytical model for initial transducer parameter exploration.
  • Employed a 3D multiphysics finite element model for design refinement.
  • Conducted experimental validation using a 3D laser Doppler vibrometer system.

Main Results:

  • Achieved a modal selectivity of 23 dB for SH 0 waves within a 20° beam angle at 425 kHz in a 1.59 mm aluminum plate.
  • Determined a 6 dB wavefront angle of 86°.
  • Demonstrated excellent agreement between analytical, finite element, and experimental results.

Conclusions:

  • The proposed piezoelectric transducer design effectively generates plane SH 0 waves with high purity.
  • This optimized transducer design significantly advances ultrasonic guided wave structural health monitoring capabilities.