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A modified sideband peak count based nonlinear ultrasonic technique for material characterization.

SeHyuk Park1, Tribikram Kundu1

  • 1Department of Civil and Architectural Engineering and Mechanics, University of Arizona, Tucson, AZ 85721, United States.

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Summary

This study introduces a modified nonlinear ultrasonic technique, Sideband Peak Intensity (SPI), for detecting micro-defects crucial for structural health monitoring. The SPI technique offers a robust and user-friendly alternative to the Sideband Peak Count - Index (SPC-I) method.

Keywords:
Damage MonitoringNon-Destructive Testing and Evaluation (NDT&E)Nonlinear Ultrasonic TechniqueSideband Peak CountStructural Health Monitoring (SHM)

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-Destructive Testing and Evaluation (NDT&E)

Background:

  • Conventional linear ultrasonic NDT&E is effective for macro-defects but fails to detect critical micro-defects.
  • Micro-defects, originating from dislocations, precede macro-defect formation and influence crack growth rates.
  • Early detection of micro-defects is vital for preventing catastrophic structural failures.

Purpose of the Study:

  • To modify and evaluate a nonlinear ultrasonic technique for enhanced micro-defect detection.
  • To compare the performance of the modified Sideband Peak Intensity (SPI) technique with the existing Sideband Peak Count - Index (SPC-I) technique.
  • To assess the suitability of these techniques for monitoring impact-induced damage in metals.

Main Methods:

  • Modification of the Sideband Peak Count - Index (SPC-I) nonlinear ultrasonic technique to develop the Sideband Peak Intensity (SPI) technique.
  • Application of both SPC-I and the modified SPI techniques to monitor damage progression in metals subjected to impact.
  • Comparative analysis of the similarities and dissimilarities between the SPC-I and SPI techniques.

Main Results:

  • The modified SPI technique demonstrates increased robustness and ease of implementation compared to SPC-I.
  • Both techniques were successfully employed to monitor damage progression in impact-induced metal damages.
  • Similarities and differences in damage monitoring capabilities between SPC-I and SPI were identified.

Conclusions:

  • The SPI technique is a versatile and robust tool for general damage monitoring, suitable for users with less specialized skills.
  • The SPC-I technique, while requiring more expertise, offers higher sensitivity and flexibility for detailed material damage analysis.
  • Both nonlinear ultrasonic techniques contribute to advancing structural health monitoring by enabling the detection of critical micro-defects.