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Parametric study on interply tracking in multilayer composites by analytic-signal technology.

Xiaoyu Yang1, Erik Verboven2, Bing-Feng Ju3

  • 1Mechanics of Materials and Structures (UGent-MMS), Ghent University, Gent, Belgium; The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, People's Republic of China.

Ultrasonics
|December 8, 2020
PubMed
Summary

This study enhances ultrasonic testing for composite materials by analyzing errors in interply tracking. A new method using analytic signals and log-Gabor filters improves accuracy for internal structure reconstruction.

Keywords:
Analytic-signalError analysisInterply trackMultilayer compositeParametric study

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustics

Background:

  • Ultrasonic testing with analytic-signal concepts can reconstruct composite internal ply structures.
  • Current methods using instantaneous metrics for interply tracking have drawbacks, including sensitivity to inspection conditions.

Purpose of the Study:

  • To analytically study errors in phase-derived interply tracking.
  • To provide guidelines for improving interply tracking performance in real-world composite inspections.
  • To develop a robust method for reconstructing internal ply structures using ultrasound.

Main Methods:

  • Analytical study of interply tracking errors considering signal-to-noise ratio, bandwidth, interply thickness, and attenuation.
  • Experimental validation using analytic-signal procedure combined with a log-Gabor filter for frequency domain analysis.
  • Application to a 24-layer composite laminate for interply track derivation.

Main Results:

  • Identified and analyzed critical parameters affecting interply tracking accuracy.
  • Demonstrated the effectiveness of a log-Gabor filter in selecting appropriate frequency bands and handling noise.
  • Successfully reconstructed ply tracks in A-scan, B-scan, and C-scan modes, verifying the procedure's performance.

Conclusions:

  • The developed analytic-signal and log-Gabor filter approach offers a robust method for interply tracking in composite materials.
  • This technique improves the accuracy and reliability of internal structure reconstruction in ultrasonic testing.
  • The findings provide practical guidelines for enhancing ultrasonic inspection of composites.