Artículo
Crack-induced electrical resistivity changes in cracked CNT-reinforced composites
Autor/es | Rodríguez de Tembleque Solano, Luis
García Sánchez, Felipe García Macías, Enrique Buroni, Federico Carlos Sáez Pérez, Andrés |
Departamento | Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras |
Fecha de publicación | 2020-04 |
Fecha de depósito | 2024-02-08 |
Publicado en |
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Resumen | Carbon nanotube (CNT)-reinforced composites exhibit a piezoresistive behavior that permits their use as sensors in novel structural health monitoring (SHM) applications, by measuring the electrical resistivity change of ... Carbon nanotube (CNT)-reinforced composites exhibit a piezoresistive behavior that permits their use as sensors in novel structural health monitoring (SHM) applications, by measuring the electrical resistivity change of the CNT modified laminate. However, the presence of cracks in such composite materials may not only compromise their structural integrity, but may as well alter their capability to act as reliable piezoresistive sensors. In this paper, we conduct a numerical study aimed at quantifying how the presence of cracks in reinforced polymer composites does influence their electrical conductivity and, consequently, their sensor performance. To this end, the electromechanical constitutive properties of the composite are determined by a mixed micromechanics approach that allows characterizing both the elastic properties and the strain-induced alterations in the overall electrical conductivity of the CNT-reinforced composite. The strain response of the cracked composite domain is accurately determined by means of a dual Boundary Element (BE) approach. Electrical conductivity in the cracked composite follows from its computed strain state at each point in the domain. Subsequently, the resulting non-homogeneous electrical conductivity problem is solved using a finite differences scheme that also accounts for semipermeable crack-face electrical boundary conditions. Several parametric studies are conducted to illustrate the influence of various crack geometries in the piezoresistive behavior of CNT-reinforced composites at varying CNTs concentrations. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | RTI2018-094945-B-C21
DPI2017-89162-R |
Cita | Rodríguez de Tembleque Solano, L., García Sánchez, F., García Macías, E., Buroni, F.C. y Sáez Pérez, A. (2020). Crack-induced electrical resistivity changes in cracked CNT-reinforced composites. Theoretical and Applied Fracture Mechanics, 106, 102470. https://doi.org/10.1016/j.tafmec.2019.102470. |
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