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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Locating and Imaging Fiber Breaks in CFRP Using Guided Wave Tomography and Eddy Current Testing.

Dario J Pasadas1, Mohsen Barzegar1, Artur L Ribeiro1

  • 1Instituto de Telecomunicações, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal.

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Summary

This study combines guided Lamb wave tomography and eddy current testing to detect and assess fiber breaks in carbon-fiber-reinforced plastic (CFRP) structures, enabling precise damage localization and evaluation.

Keywords:
CFRPeddy current testing (ECT)fiber breaksguided wave testing (GWT)

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Structural Health Monitoring

Background:

  • Carbon-fiber-reinforced plastic (CFRP) composites are susceptible to fiber breaks, compromising structural integrity.
  • Accurate detection and evaluation of fiber breaks are crucial for CFRP safety and maintenance.

Purpose of the Study:

  • To develop and validate a combined guided Lamb wave tomography and eddy current testing (ECT) approach for locating and evaluating fiber breaks in CFRP.
  • To enhance the precision of damage assessment in CFRP structures.

Main Methods:

  • Guided wave testing (GWT) and computed tomography (CT) imaging were used for rapid fiber break localization.
  • Signal processing techniques (wavelet, Hilbert transforms) and statistical functions (skewness, kurtosis) extracted features from B-scans.
  • Image fusion techniques combined information from multiple reconstructed images.
  • Eddy current testing (ECT) with a double excitation probe evaluated fiber break condition using C-scans.

Main Results:

  • The combined GWT and CT approach successfully located fiber breaks in CFRP plates.
  • Image fusion provided complementary information for more accurate damage assessment.
  • ECT C-scans effectively evaluated the condition of the identified fiber breaks.

Conclusions:

  • The integrated guided Lamb wave tomography and ECT method offers a robust solution for detecting and characterizing fiber breaks in CFRP.
  • This technique enhances the capabilities of structural health monitoring for composite materials.