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Polyetherimide-Reinforced Smart Inlays for Bondline Surveillance in Composites.

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A new sensor inlay monitors cracks in carbon fiber components. This technology detects and estimates crack distance, improving the safety and application of lightweight composite materials.

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composite structuresfoil sensorsfunction conformitymultifunctional bondlinesensor integrationstructural bondingstructural health monitoringthin-film sensors

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Structural Health Monitoring

Background:

  • Structural carbon fiber-reinforced plastic (CFRP) components are increasingly used in demanding applications.
  • Monitoring crack initiation and growth in bondlines is critical for ensuring structural integrity.
  • Existing methods may not adequately address the unique challenges of internal bondline monitoring in CFRP.

Purpose of the Study:

  • To develop and validate an integrable sensor inlay for real-time monitoring of cracks within CFRP bondlines.
  • To assess the sensor system's ability to detect crack initiation and growth under various mechanical loads.
  • To evaluate the industrial applicability and potential benefits for lightweight CFRP constructions.

Main Methods:

  • Fabrication of a sensor inlay using poly(vinyliden fluoride) (PVDF) and polyetherimide (PEI) layers with metallic measuring grids.
  • Integration of the sensor inlay within the bondline of CFRP components.
  • Testing the sensor system's performance using static load tests and cyclic long-term fatigue testing (up to 1,000,000 cycles).
  • Analysis of sensor signals for crack detection and distance estimation.

Main Results:

  • The sensor inlay successfully monitored crack initiation and growth inside bondlines, regardless of mechanical loads.
  • Demonstrated robust performance through static and extensive cyclic fatigue testing.
  • Validated the ability to estimate crack distance based on sensor signals.
  • Ensured good adhesion and mechanical integrity of the sensor system within the CFRP structure.

Conclusions:

  • The developed sensor inlay provides a reliable method for detecting internal cracks in CFRP bondlines.
  • The system enhances structural health monitoring capabilities, enabling better exploitation of lightweight CFRP.
  • The industrial applicability of the inlay integration process facilitates broader adoption in advanced manufacturing.