18 April 2011 Interaction of surface waves induced by IDT sensors with flaws in fiberglass composite panels
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Abstract
Polyester resin based glass fiber reinforced composite panels obtained from a local windmill turbine blade part manufacturing company are used to evaluate the performance of inter-digital transducer (IDT) surface wave transducers. Interaction of surface waves with fiberglass layers is addressed in this work. Additionally, artificially created flaws such as cracks, impact damage and delamination are also studied in terms of amplitude changes in order to attempt to quantify the size, location and severity of damage in the test panels. As a potential application to the structural health monitoring (SHM) of windmill turbine blades, the coverage distance within the width of the sound field is estimated to be over 80 cm when a set of IDT sensors consisted of one transmitter and two receivers in a pitch-catch mode.
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Jeong K. Na, Jeong K. Na, Vijay Nalladega, Vijay Nalladega, Carl Druffner, Carl Druffner, "Interaction of surface waves induced by IDT sensors with flaws in fiberglass composite panels", Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 79830Q (18 April 2011); doi: 10.1117/12.881227; https://doi.org/10.1117/12.881227
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