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Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring
Structural Health Monitoring
  • Antonella D'Alessandro, University of Perugia
  • Filippo Ubertini, University of Perugia
  • Annibale L. Materazzi, University of Perugia
  • Simon Laflamme, Iowa State University
  • Maurizio Porfiri, New York University Polytechnic School of Engineering
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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.

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

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Antonella D'Alessandro, Filippo Ubertini, Annibale L. Materazzi, Simon Laflamme, et al.. "Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring" Structural Health Monitoring Vol. 14 Iss. 2 (2014) p. 137 - 147
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