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Updated: Sep 22, 2025

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Exploring 3D elastic-wave scattering at interfaces using high-resolution phased-array system.

Yoshikazu Ohara1, Marcel C Remillieux2, Timothy James Ulrich2

  • 1Department of Materials Processing, Tohoku University, Sendai, Miyagi, 980-8579, Japan. ohara@material.tohoku.ac.jp.

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Summary
This summary is machine-generated.

Understanding complex 3D elastic-wave scattering from cracks is vital for nondestructive inspections. A new piezoelectric and laser ultrasonic system (PLUS) resolves cracks into scattering sources, revealing diverse scattering patterns for improved material characterization.

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Area of Science:

  • Materials Science
  • Nondestructive Testing
  • Wave Physics

Background:

  • Elastic-wave scattering at interfaces, particularly cracks, is fundamental to nondestructive inspection (NDI).
  • Three-dimensional (3D) elastic-wave scattering at cracks is complex due to microscopic asperities acting as multiple scattering sources.
  • Accurate characterization of crack scattering is crucial for reliable NDI and material integrity assessment.

Purpose of the Study:

  • To develop and demonstrate a novel method for exploring 3D elastic-wave scattering from cracks.
  • To characterize the complex scattering behavior originating from crack asperities.
  • To provide a versatile methodology applicable to various materials for advanced NDI.

Main Methods:

  • Utilized a high-resolution 3D phased-array system: the piezoelectric and laser ultrasonic system (PLUS).
  • PLUS combines a piezoelectric transmitter with a 2D mechanical scan of a laser Doppler vibrometer.
  • The system resolves cracks into discrete scattering sources and extracts 3D elastic-wave scattering from each response.

Main Results:

  • Experimental application of PLUS to a fatigue-crack specimen revealed diverse 3D elastic-wave scattering patterns.
  • Scattering behavior was found to be dependent on the specific responses within the fatigue crack.
  • The study successfully demonstrated the extraction of localized 3D scattering information.

Conclusions:

  • The PLUS methodology effectively captures complex 3D elastic-wave scattering from crack asperities.
  • This approach enables optimization of inspection conditions and ultrasonic system design for crack characterization.
  • The general applicability of PLUS to metals, composites, concrete, and rocks signifies a significant advancement in NDI.