Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 197, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108273
Keywords
Nano composites; Thermal properties; Ultrasonic testing; Additive manufacturing; Structural health monitoring
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Funding
- National Natural Science Foundation of China [51875492, 51635008]
- Hong Kong Research Grants Council via General Research Funds [15204419, 15212417]
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The sensing performance of nanocomposite piezoresistive sensors in acquiring broadband acousto-ultrasonic wave signals is scrutinized in an extensive regime of temperature variation from -60 to 150 degrees C, which spans the thermal extremes undergone by most aircraft and spacecraft. Ultralight and flexible, the sensors are all-inkjetprinted using a drop-on-demand additive manufacturing approach, and then optimized sensitive to the ultraweak disturbance induced by acousto-ultrasonic waves in virtue of quantum tunneling effect. Under high-intensity thermal cycles from -60 to 150 degrees C, the sensors have proven stability and accuracy in responding to signals in a broad band from static to half a megahertz. Compared with conventional broadband sensors such as piezoelectric wafers, this genre of inkjet-printed nanocomposite sensors avoids the influence of increased dielectric permittivity during the measurement of high-frequency signals at elevated temperatures. Use of the sensors for characterizing undersized cracks in a typical aerospace structural component under acute temperature variation has spotlighted the alluring application potentials of the all-inkjet-printed nanocomposite sensors in implementing in-situ structural health monitoring for key aircraft and spacecraft components.
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