Health monitoring of composite structures throughout the life cycle

James Chilles*, Anthony Croxford, Ian Bond

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

This study demonstrates the capability of inductively coupled piezoelectric sensors to monitor the state of health throughout the lifetime of composite structures. A single sensor which generated guided elastic waves was embedded into the stacking sequence of a large glass fiber reinforced plastic plate. The progress of cure was monitored by measuring variations in the amplitude and velocity of the waveforms reflected from the plate's edges. Baseline subtraction techniques were then implemented to detect barely visible impact damage (BVID) created by a 10 Joule impact, at a distance of 350 mm from the sensor embedded in the cured plate. To investigate the influence of mechanical loading on sensor performance, a single sensor was embedded within a glass fiber panel and subjected to tensile load. The panel was loaded up to a maximum strain of 1%, in increments of 0.1% strain. Guided wave measurements were recorded by the embedded sensor before testing, when the panel was under load, and after testing. The ultrasonic measurements showed a strong dependence on the applied load. Upon removal of the mechanical load the guided wave measurements returned to their original values recorded before testing. The results in this work show that embedded piezoelectric sensors can be used to monitor the state of health throughout the life-cycle of composite parts, even when subjected to relatively large strains. However the influence of load on guided wave measurements has implications for online monitoring using embedded piezoelectric transducers.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Subtitle of host publicationNondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016
PublisherSociety of Photo-Optical Instrumentation Engineers (SPIE)
Volume9804
ISBN (Print)9781510600454
DOIs
Publication statusPublished - 20 Mar 2016
EventNondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016 - Las Vegas, United States
Duration: 21 Mar 201624 Mar 2016

Conference

ConferenceNondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016
CountryUnited States
CityLas Vegas
Period21/03/1624/03/16

Keywords

  • Cure Monitoring
  • Damage detection
  • Durability
  • Embedded
  • Guided wave
  • Inductively coupled
  • Ultrasonic

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