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Correction: Seno, A.H.; Ferri Aliabadi, M.H. Impact Localisation in Composite Plates of Different Stiffness Impactors under Simulated Environmental and Operational Conditions. <i>Sensors</i> 2019, <i>19</i>, 3659.

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Structural Integrity Assessment of Composites Plates with Embedded PZT Transducers for Structural Health Monitoring.

Tianyi Feng1, M H Ferri Aliabadi1

  • 1Structural Integrity and Health Monitoring, Department of Aeronautics, Imperial College London, South Kensington, London SW7 2AZ, UK.

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Summary

Novel diagnostic films with piezoelectric lead zirconate titanate (PZT) transducers show stable performance under fatigue loading. Embedding these films in composite structures minimally impacts mechanical properties, offering a lightweight solution for structural health monitoring.

Keywords:
embedded PZT transducersfatigue testsstructural health monitoring (SHM)tensile and compressive teststhick composites

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Structural Health Monitoring

Background:

  • Active sensing with ultrasonic guided waves (UGW) is crucial for composite structure damage detection.
  • Traditional PZT sensor cable connections add weight.
  • A novel circuit-printed diagnostic film using PZT transducers offers a lightweight alternative.

Purpose of the Study:

  • To evaluate the fatigue integrity of PZT transducers within diagnostic films.
  • To assess the impact of embedded diagnostic films on composite material mechanical properties.
  • To investigate the effectiveness of electro-mechanical impedance (EMI) and UGW for monitoring sensor performance under fatigue.

Main Methods:

  • Embedding diagnostic films into composite structures using an edge cut-out method.
  • Subjecting embedded PZT transducers to fatigue loading (up to 1 million cycles).
  • Monitoring EMI properties and UGW behavior.
  • Conducting tensile and compressive tests on composite coupons with and without embedded films.

Main Results:

  • PZT transducer EMI properties and UGW behaviors remained stable up to 1 million fatigue cycles within specified force ranges.
  • Embedding diagnostic films reduced the elastic modulus of composite coupons by up to 20% (tensile) and 10% (compressive).
  • Observed reductions are considered worst-case scenarios for limited film integration.

Conclusions:

  • Diagnostic films with PZT transducers are robust under significant fatigue loading.
  • The weight reduction benefit of diagnostic films outweighs minor impacts on mechanical properties.
  • This technology presents a promising, lightweight solution for structural health monitoring in composite materials.