Wireless actuation of piezo-elements for the structural health monitoring of carbon-fiber-reinforced-polymers

Salas, Mariugenia; Focke, Oliver; Herrmann, Axel S.; Lang, Walter

doi:10.1016/j.mechatronics.2015.09.003

Cited by 6 publications

(1 citation statement)

References 13 publications

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“…This specific type of surface waves was created and measured with external sensors. The disadvantage of this method is, that Lamb waves are also sensitive to mechanical changes and damages which are not related to the humidity uptake [14,15]. Davis demonstrated that electrochemical impedance spectroscopy is also suitable to measure the moisture content at a CFRP to concrete bond [16].…”

Section: Introductionmentioning

confidence: 99%

Online Monitoring of Moisture Diffusion in Carbon Fiber Composites Using Miniaturized Flexible Material Integrated Sensors

Hübner

Lepke

Hardi³

et al. 2019

Sensors

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Moisture diffusion in carbon fiber composites changes the mechanical properties of the composite. Therefore, a monitoring method of the actual content of moisture in the composite is important. However, at the moment there are no online methods established. A common method is the measurement of the mass changes due to water uptake. This method is not suitable for online monitoring of a real composite part in service. We demonstrate that miniaturized flexible interdigital sensors are suitable for moisture measurement inside the carbon fiber composite. These sensors are directly integrated inside the composite. It was already demonstrated that these can be successfully used for resin-curing monitoring as a primary application. Here we demonstrate that the same sensors are also suitable for moisture measurement inside the material. In order to do so, we expose samples with and without integrated sensors to hot-wet conditions and measure the dielectric changes with the sensors and the mass gain. The moisture concentration and the measured admittance can be directly correlated to each other. This demonstrates that the sensors can be used for moisture measurement as a secondary application. In addition, it is shown that the sensors have the potential to measure the moisture locally inside the material.

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Section: Introductionmentioning

confidence: 99%