Embedded piezoelectric transducers in carbon fibre composites for nonlinear ultrasonic applications

Christos Adreades, Francesco Ciampa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

There has been a growing interest over the last few years in developing "smart" carbon fibre reinforced plastic (CFRP) composites with integrated piezoelectric lead zirconate titanate (PZT) transducers, which are able to provide real-time ultrasonic monitoring of aircraft components. However, piezo-sensors embedded in CFRP laminates require electrical insulation layers due to the electrical conductivity of carbon fibres, which may compromise the mechanical properties of the composite. Typically, non-conductive materials such as polyimide (Kapton) films or polymer coatings are used as interlayers between the sensor and the composite ply for electrical insulation. Nevertheless, these materials increase the level of material distortion around the PZT and can dramatically reduce the adhesion between laminate plies. Thus, the structural integrity of the component may significantly be affected. This paper proposes a novel design of embedded PZTs in CFRP composites, which consists of insulating the conductive surface of the PZT with a thin layer of plain glass fibres. In this research work, the effect of PZT embedment on the flexural and interlaminar shear strength of CFRP laminates was experimentally investigated through long-beam and short-beam three-point bending tests. A failure analysis inspection of the laminates subject to mechanical loading was also conducted using an optical microscope. Test results revealed that the proposed configuration had no impact on the interlaminar properties of the CFRP laminate. In particular, the difference in maximum stress and deflection to failure between the laminates with embedded PZTs and plain laminates was less than 3%. Moreover, a pitch-catch nonlinear vibro-acoustic experiment was performed to study the sensitivity in damage detection of the proposed configuration of embedded PZTs compared to the case of conventional surface-bonded PZTs. The results obtained from CFRP laminates with in-plane delamination showed a higher level of second harmonic generation at the local damage resonance (LDR) frequency using this configuration of embedded PZTs. Besides applications on in-service monitoring of aircraft components, such "smart" composites have the potential to be used within other engineering sectors.

LanguageEnglish
Title of host publicationProceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017
Subtitle of host publicationVolume 1
PublisherDEStech Publications
Pages739-746
Number of pages8
ISBN (Electronic)9781605953304
StatusPublished - 2017
Event11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance - Stanford University, Stanford, USA United States
Duration: 12 Sep 201714 Sep 2017
http://web.stanford.edu/group/sacl/workshop/IWSHM2017/index.html

Conference

Conference11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017
Abbreviated titleIWSHM 2017
CountryUSA United States
CityStanford
Period12/09/1714/09/17
Internet address

Fingerprint

Ultrasonic applications
Piezoelectric transducers
Carbon fiber reinforced plastics
Transducers
Ultrasonics
Plastic laminates
Carbon fibers
Laminates
Composite materials
Lead
Aircraft
Insulation
Shear Strength
Electric Conductivity
Monitoring
Damage detection
Sensors
Bending tests
Structural integrity
Harmonic generation

ASJC Scopus subject areas

  • Health Information Management
  • Computer Science Applications

Cite this

Adreades, C., & Ciampa, F. (2017). Embedded piezoelectric transducers in carbon fibre composites for nonlinear ultrasonic applications. In Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017: Volume 1 (pp. 739-746). DEStech Publications.

Embedded piezoelectric transducers in carbon fibre composites for nonlinear ultrasonic applications. / Adreades, Christos; Ciampa, Francesco.

Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017: Volume 1. DEStech Publications, 2017. p. 739-746.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Adreades, C & Ciampa, F 2017, Embedded piezoelectric transducers in carbon fibre composites for nonlinear ultrasonic applications. in Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017: Volume 1. DEStech Publications, pp. 739-746, 11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017, Stanford, USA United States, 12/09/17.
Adreades C, Ciampa F. Embedded piezoelectric transducers in carbon fibre composites for nonlinear ultrasonic applications. In Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017: Volume 1. DEStech Publications. 2017. p. 739-746
Adreades, Christos ; Ciampa, Francesco. / Embedded piezoelectric transducers in carbon fibre composites for nonlinear ultrasonic applications. Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017: Volume 1. DEStech Publications, 2017. pp. 739-746
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