8 April 2009 Temperature effects in Lamb-wave structural health monitoring systems
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Abstract
There is a need to better understand the effect of temperature changes on the response of ultrasonic guided-wave pitchcatch systems used for Structural Health Monitoring. A model is proposed to account for all relevant temperaturedependent parameters of a pitch-catch system on an isotropic plate and a fiber-reinforced composite laminate, including the actuator-plate and plate-sensor interactions through shear-lag behavior, the piezoelectric and dielectric permittivity properties of the transducers, and the Lamb wave dispersion properties of the substrate plate. The model is used to predict the S0 response spectra in for the temperature range of -40°C to +60°C which accounts for normal aircraft operations. The transducers examined are flexible Macro-Fiber Composite type P1 patches. The study shows substantial changes in Lamb wave amplitude response caused solely by temperature excursions. It is also shown that, for the transducers considered, the response amplitude changes follow two opposite trends below and above ambient temperature (20°C), respectively. These results can provide a basis for the compensation of temperature effects in guided-wave damage detection systems.
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Salvatore Salamone, Salvatore Salamone, Francesco Lanza di Scalea, Francesco Lanza di Scalea, Ivan Bartoli, Ivan Bartoli, } "Temperature effects in Lamb-wave structural health monitoring systems", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72950O (8 April 2009); doi: 10.1117/12.815443; https://doi.org/10.1117/12.815443
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