A nanocomposite-inspired smart sensing coating for acousto-ultrasonics-based structural health monitoring: Modeling, validation and application

Yaozhong Liao, Menglong Liu, Hao Xu, Li Min Zhou, Zhongqing Su

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

An innovative smart sensing coating based on the nanocomposites made of carbon black (CB) and polyvinylidene fluoride (PVDF) is developed. This coating exhibits high fidelity, fast-response and high sensitivity to broadband acousto-ultrasonic waves (from static to high frequency up to 400 kHz). Making use of the tunneling effect [1], the nanostructure of the developed nanocomposites allows the coating to perceive low dynamic disturbance induced by acousto-ultrasonic waves. Morphological characterization is implemented on the prepared nanocomposites to reveal the sensing mechanism of the sensor. For the sake of balancing conductivity and sensitivity, 6.5 wt% of CB nanofiller is determined based on morphological characterization. Performance of the coating is demonstrated by using the sensing coating to capture acousto-ultrasonic waves from low-frequency vibration, through medium-frequency impact signals to high-frequency ultrasonic waves, to show good coincidence, frequencyindependence and higher gauge factor compared with conventional piezoelectric transducers and strain gauges [2]. Lightweight and flexible, the developed sensing coating offers superior designability and tailorablilty, allowing it to be embedded in engineering structures of various geometries and materials, whereas with minimum weight penalty. In addition, a nano-scale model is developed, to facilitate understanding of the sensing mechanism and to corroborate experimental results. Last, the developed sensing coating is applied to acousto-ultrasonicsbased structural health monitoring (SHM), including passive impact localization and active damage identification, highlighting that the coating has paved a new path for implementing insitu SHM, by striking a compromise between "sensing cost" and "sensing effectiveness".
Original languageEnglish
Title of host publication8th Conference on Smart Structures and Materials, SMART 2017 and 6th International Conference on Smart Materials and Nanotechnology in Engineering, SMN 2017
PublisherInternational Center for Numerical Methods in Engineering
Pages1172-1182
Number of pages11
Volume2017-January
ISBN (Electronic)9788494690938
Publication statusPublished - 1 Jan 2017
Event8th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2017 and 6th International Conference on Smart Materials and Nanotechnology in Engineering, SMN 2017 - Department of Aeronautics, Polytechnic University of Madrid, Madrid, Spain
Duration: 5 Jun 20178 Jun 2017

Conference

Conference8th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2017 and 6th International Conference on Smart Materials and Nanotechnology in Engineering, SMN 2017
CountrySpain
CityMadrid
Period5/06/178/06/17

Keywords

  • Acousto-ultrasonics
  • Carbon nanocomposites
  • Smart sensing coating
  • Structural health monitoring

ASJC Scopus subject areas

  • Materials Science(all)
  • Energy(all)
  • Pollution

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