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Updated: Jun 3, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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An Electrical Method to Detect Both Crack Creation and Propagation in Solid Electrical Insulators.

Tara Niakan1, Zarel Valdez-Nava1, David Malec1

  • 1LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 31077 Toulouse, France.

Materials (Basel, Switzerland)
|January 11, 2025
PubMed
Summary

Fracto-emission, the release of charged particles during material fracture, generates detectable electrical signals. This study demonstrates its potential for tracking cracks in dielectric materials like fiberglass-reinforced epoxy.

Keywords:
crack creationcrack detectioncrack propagationdielectric materialfracto-emissionmechanical breakdown

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Area of Science:

  • Materials Science
  • Physics
  • Electrical Engineering

Background:

  • Fracto-emission involves the release of electrons and ions during mechanical fracture.
  • Fractures in insulating materials can generate detectable electrical signals.
  • Understanding these signals can aid in non-destructive material analysis.

Purpose of the Study:

  • To theoretically model and experimentally verify the electrical signals produced by crack propagation in dielectric materials.
  • To investigate the feasibility of using fracto-emission for crack detection and tracking.

Main Methods:

  • Developed theoretical equations for crack creation and propagation under varying electrical conditions.
  • Conducted experiments on fiberglass-reinforced epoxy laminate samples without external voltage.
  • Utilized a fast signal recorder to measure induced current signals.

Main Results:

  • Measured current signals ranging from 50 mA to 100 mA within a 200 ns timeframe.
  • Achieved a high signal-to-noise ratio, confirming the signals were not measurement artifacts.
  • Validated the theoretical framework for signal generation during fracture.

Conclusions:

  • Fracto-emission provides a measurable electrical signal indicative of crack propagation in dielectric materials.
  • The experimental results support the potential of this phenomenon for identifying and monitoring internal cracks.
  • This technique offers a promising avenue for non-destructive evaluation of material integrity.