4.7 Article

Enhanced lumped circuit model for smart nanocomposite cement-based sensors under dynamic compressive loading conditions

期刊

SENSORS AND ACTUATORS A-PHYSICAL
卷 260, 期 -, 页码 45-57

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2017.04.004

关键词

Carbon nanotube; Cement-matrix composites; Lumped equivalent circuit; DC electrical resistance; Smart concrete; Structural Health Monitoring

资金

  1. Ministerio de Economia y Competitividad of Spain [DPI2014-53947-R]
  2. Spanish Ministry of Education [FPU13/04892]
  3. Italian Ministry of Education, University and Research (MIUR) through Project of Relevant National Interest (PRIN) entitled SMART-BRICK: Novel strain-sensing nano-composite clay brick enabling self-monitoring masonry structures [2015MS5L27]
  4. National Science Foundation [1069283]
  5. Integrative Graduate Education and Research Traineeship (IGERT) in Wind Energy Science, Engineering and Policy (WESEP) at Iowa State University

向作者/读者索取更多资源

Smart composite nanostructured materials represent one of the fastest-growing areas of interest among scientists in recent years and, in particular, carbon nanotube (CNT) cement-based composites are attracting more and more attention. These composites exhibit self-sensing capabilities providing measurable variations of their electrical properties under the application of mechanical deformations. Together with this exceptional property, the similarity and compatibility between these composites and structural concrete suggest the possibility of developing distributed embedded strain-sensing systems with substantial improvements in the cost-effectiveness in applications to large-scale concrete structures. In order to design and optimize CNT reinforced cement based dynamic sensors, it is fundamental to develop theoretical models capable of simulating the relationship between dynamic mechanical strains and the effective electrical conductivity. This paper presents an electromechanical modeling of the Direct Current (DC) electrical resistance of CNT reinforced cement paste sensors based on a piezoelectric/piezoresistive lumped circuit. The model represents an enhanced version and a generalization of another model previously proposed by the authors. Previously published experimental results have been used as validation benchmark. In particular, experimental tests concerning the characterization of the step response under unloaded conditions, steady state response under harmonic loadings and sweep analyses are considered. The results demonstrate that the newly proposed model is superior in comparison to the previous one in reproducing the dynamic response of the sensors when subjected to harmonic mechanical loads. Overall, an excellent agreement between theoretical predictions and experimental results is achieved. (C) 2017 Elsevier B.V. All rights reserved.

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