10 April 2007 Effect of adhesive properties on elastic wave generation by bonded sensors
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Surface bonded sensors have significant potential for detecting and characterizing damage in legacy aircraft structures as part of a Structural Health Monitoring system. In this effort, research has been undertaken to understand the impact of adhesive viscoelastic properties on the generation of elastic wave energy by surface-bonded sensors in thin plates. Previous work has shown that bonded sensors can degrade and fail due to exposure to weather, vibration, temperature, and mechanical loading. In that work, experimental and analytical studies were performed to characterize the transfer of static load from a structure into a surface-bonded sensor. The results indicated that the sensor should be decoupled from the nearly static loading induced from the structure to improve its durability. In this effort, we build on that original work to determine what effect the adhesive has on elastic wave generation and reception in the host structure. The results indicate that strong coupling with the structure is required for effective generation and reception of elastic waves, where the elastic material properties of the sensor, bond, and host structure were considered. Although the two goals appear to be contradictory (sensor durability and elastic wave generation), the use of a strongly viscoelastic adhesive is viewed as potential solution for both by allowing weak coupling at low frequencies and strong coupling at high frequencies.
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Steven A. Martin, Steven A. Martin, James L. Blackshire, James L. Blackshire, } "Effect of adhesive properties on elastic wave generation by bonded sensors", Proc. SPIE 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, 65300J (10 April 2007); doi: 10.1117/12.715312; https://doi.org/10.1117/12.715312

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