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Title: A nanocomposite-inspired smart sensing coating for acousto-ultrasonics-based structural health monitoring : modeling, validation and application
Authors: Liao, YZ 
Liu, ML 
Xu, H
Zhou, LM 
Su, ZQ 
Issue Date: 2017
Source: In A Guemes, A Benjeddou, J Rodellar & J Leng (Eds.), Proceedings of the 8th ECCOMAS Thematic Conference on Smart Structures and Materials (SMART 2017) & the 6th International Conference on Smart Materials and Nanotechnology in Engineering (SMN2017), 5-8 June 2017, Madrid, Spain, p. 1172-1182
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, frequency-independence 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-ultrasonics-based structural health monitoring (SHM), including passive impact localization and active damage identification, highlighting that the coating has paved a new path for implementing in-situ SHM, by striking a compromise between “sensing cost” and “sensing effectiveness”.
Keywords: Smart sensing coating
Carbon nanocomposites
Structural health monitoring
Publisher: International Center for Numerical Methods in Engineering (CIMNE)
ISBN: 978-84-946909-3-8
Appears in Collections:Conference Paper

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