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Structural Health Monitoring of Composites Using Integrated and Flexible Piezoelectric Ultrasonic TransducersIndustrial Materials Institute, National Research Council of Canada, 75 Blvd. de Mortagne, Boucherville, Quebec J4B 6Y4, Canada
Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec H3A 2A7, Canada
Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec H3A 2A7, Canada
Industrial Materials Institute, National Research Council of Canada, 75 Blvd. de Mortagne, Boucherville, Quebec J4B 6Y4, Canada, cheng-kuei.jen{at}cnrc-nrc.gc.ca
Department of National Defence, Defence R&D Canada, Air Vehicles Research Section, National Defence Headquarters, Ottawa, Ontario, K1A 0K2, Canada
Two types of ultrasonic sensors are presented for structural health monitoring (SHM) and non-destructive testing (NDT) of graphite/epoxy (Gr/Ep) composites of thickness ranging from 1 mm to 12.7 mm. These piezoelectric film-based sensors are fabricated using a sol-gel spray technique. The center operation frequency of these sensors ranges from 1.3 MHz to 14.5 MHz. For the first sensor type, piezoelectric films of thickness
Key Words: integrated ultrasonic transducer • flexible ultrasonic transducer • graphite/epoxy composite • structural health monitoring • non-destructive testing • non-contact method.
This version was published on May
1, 2009 Journal of Intelligent Material Systems and Structures, Vol. 20, No. 8,
969-977 (2009) |
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30 µm were deposited directly onto planar and curved Gr/Ep composites surfaces as integrated sensors. Ultrasonic signals propagating in a distance of more than 300 mm have been obtained. Anisotropy of 08 and 908 cross ply Gr/Ep composite is measured and delamination detected. For the second sensor type, piezoelectric films are coated onto a 50 µm thick polyimide membrane as flexible sensors that may be attached to a host composite structure with planar or curved surfaces. An induction type non-contact method for the interrogation of the Gr/Ep composites using integrated sensors is also presented.