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Phononic Crystal Waveguide Transducers for Nonlinear Elastic Wave Sensing.

Francesco Ciampa1, Akash Mankar2, Andrea Marini3

  • 1Materials and Structures Centre (MAST), Department of Mechanical Engineering, University of Bath, Claverton Down, BA2 7AY, Bath, UK. f.ciampa@bath.ac.uk.

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Summary
This summary is machine-generated.

This study introduces a novel phononic crystal waveguide transducer for accurate micro-damage assessment using nonlinear ultrasonics. The device effectively filters out equipment-generated harmonics, enabling reliable material inspection.

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Area of Science:

  • Materials Science
  • Nonlinear Acoustics
  • Solid Mechanics

Background:

  • Second harmonic generation (SHG) is a sensitive indicator of material micro-damage.
  • Current SHG detection methods face challenges with fictitious harmonics and complex calibration.
  • Existing nonlinear ultrasonic techniques require component modification or cumbersome filters.

Purpose of the Study:

  • To develop a practical and effective method for filtering fictitious second harmonics in nonlinear ultrasonic testing.
  • To propose and validate an integrated phononic crystal waveguide transducer for micro-damage assessment.

Main Methods:

  • Development of an ultrasonic phononic crystal waveguide transducer with tunable stop-bands.
  • Theoretical modeling using a perturbative approach to predict phononic band-gaps in corrugated plates.
  • Experimental validation of the transducer's filtering capabilities and performance in damage detection.

Main Results:

  • The phononic crystal waveguide transducer successfully filters out fictitious second harmonic frequencies.
  • The device exhibits single and multiple frequency stop-bands as predicted by the theoretical model.
  • Experimental results show excellent agreement with theoretical predictions, confirming effective attenuation of equipment-generated harmonics.

Conclusions:

  • The proposed phononic crystal waveguide transducer offers a viable alternative to current nonlinear ultrasonic methods.
  • This technology enables non-invasive micro-damage assessment without altering the test component's properties.
  • The device demonstrates significant potential for acousto/ultrasonic material inspection and damage monitoring.