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Eddy Current-Based Identification and Depth Investigation of Microdefects in Steel Filaments.

Kim Sang Tran1, Bijan Shirinzadeh1, Julian Smith2

  • 1Robotics and Mechatronics Research Laboratory (RMRL), Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia.

Sensors (Basel, Switzerland)
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Summary

This study accurately detects microdefects in steel filaments using eddy current signals, establishing a reliable method for quality control in manufacturing. The findings demonstrate a strong correlation between defect depth and signal response.

Keywords:
depths of defectseddy current signalmicrodefectsreinforced fibers

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Quality Control

Background:

  • Microdefects in steel filaments are critical for component manufacturing quality.
  • Accurate detection of these defects is essential for ensuring product integrity.

Purpose of the Study:

  • To investigate the relationship between steel filament microdefect depth and eddy current signals.
  • To validate a methodology for identifying and quantifying microdefects.

Main Methods:

  • Utilized eddy current sensing to detect microdefects in steel filaments.
  • Analyzed 30 defective samples with defect depths ranging from 20 to 75 µm.
  • Compared experimental and theoretical phase angles to assess accuracy.

Main Results:

  • Established a strong correlation between defect depth and eddy current signal phase angles.
  • Calculated threshold of 10.18% closely matched the instrument's set threshold of 10%.
  • Achieved a root mean square error (RMSE) of 10.53 degrees, equivalent to 3.49 µm in depth difference.

Conclusions:

  • The eddy current methodology accurately identifies and quantifies microdefects in steel filaments.
  • The validated method is applicable to quality control in diverse manufacturing industries.
  • This technique enhances the reliability of steel filaments used in reinforced components.