Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring

Date
2014-11-24
Authors
D'Alessandro, Antonella
Ubertini, Filippo
Materazzi, Annibale
Laflamme, Simon
Porfiri, Maurizio
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Abstract

This work focuses on the analysis of a new nanocomposite cement-based sensor (carbon nanotube cement-based sensor), for applications in vibration-based structural health monitoring of civil engineering structures. The sensor is constituted of a cement paste doped with multi-walled carbon nanotubes, so that mechanical deformations produce a measurable change of the electrical resistance. Prior work of some of the authors has addressed the fabrication process, dynamic behaviour and implementation to full-scale structural components. Here, we investigate the effectiveness of a linear lumped-circuit electromechanical model, in which dynamic sensing is associated with a strain-dependent modulation of the internal resistance. Salient circuit parameters are identified from a series of experiments where the distance between the electrodes is parametrically varied. Experimental results indicate that the lumped-circuit model is capable of accurately predicting the step response to a voltage input and its steady-state response to a harmonic uniaxial deformation. Importantly, the model is successful in anticipating the presence of a superharmonic component in sensor’s output.

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This is a manuscript of an article from Structural Health Monitoring, 14(2), 2015: 137-147 doi: 10.1177/1475921714560071. Posted with permission.

Keywords
CNDE, Carbon nanotubes, electromechanical model, nanotechnology, smart materials, smart sensors, structural health monitoring
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