Journal
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
Volume 14, Issue 2, Pages 137-147Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921714560071
Keywords
Carbon nanotubes; electromechanical model; nanotechnology; smart materials; smart sensors; structural health monitoring
Funding
- Regione Umbria, within POR Umbria ESF, Axis II 'Employability' Objective 'e' Axis IV 'Human Capital' Objective 'l'
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [0969023] Funding Source: National Science Foundation
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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.
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