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High Temperature Shear Horizontal Electromagnetic Acoustic Transducer for Guided Wave Inspection.

Maria Kogia1, Tat-Hean Gan2,3, Wamadeva Balachandran4

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Novel water-cooled Electromagnetic Acoustic Transducers (EMATs) enable high-temperature Guided Wave Testing (GWT) up to 500 °C. This breakthrough allows inspection of large structures in demanding environments previously inaccessible to GWT.

Keywords:
EMATElectromagnetic Acoustic TransducersGuided Wave Testinghigh temperature inspection

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Area of Science:

  • Materials Science and Engineering
  • Non-Destructive Testing
  • Mechanical Engineering

Background:

  • Guided Wave Testing (GWT) is crucial for inspecting large structures.
  • Existing high-temperature Electromagnetic Acoustic Transducers (EMATs) are limited to thickness measurements.
  • There is a need for GWT methods suitable for high-temperature environments.

Purpose of the Study:

  • To develop novel water-cooled EMATs for high-temperature GWT.
  • To enable the inspection of large structures operating up to 500 °C.
  • To adapt EMAT technology for Shear Horizontal (SH₀) wave generation and reception in GWT.

Main Methods:

  • Development of a pair of water-cooled EMATs.
  • Excitation and reception of Shear Horizontal (SH₀) waves.
  • Thermal and Computational Fluid Dynamic (CFD) simulations.
  • Experimental validation of EMAT design and performance.
  • Testing from ambient temperature up to 500 °C.

Main Results:

  • Successful development of water-cooled EMATs for GWT.
  • EMATs demonstrated optimal high-temperature properties up to 500 °C.
  • CFD and thermal simulations were validated experimentally.
  • Optimal EMAT design, materials, and operating conditions were determined.
  • EMATs showed successful thermal and GWT performance in the target temperature range.

Conclusions:

  • The developed water-cooled EMATs are suitable for high-temperature GWT.
  • This technology expands the application of GWT to previously inaccessible high-temperature structures.
  • The findings pave the way for enhanced structural integrity monitoring in extreme conditions.